It held the 1000rpm for 10 minutes as the truck warmed up and then settled to normal idle speed of 800rpm. New fuel injectors, high pressure fuel pump, fuel pump in the tank. Dec 25, 2011 · A forum community dedicated to GMC and Chevy full size owners and enthusiasts. Smooth idle was around 18-19. what? numbers tell the tale. I've done my own maintenance for roughly the last 20 years and I would consider myself fairly knowledgeable. I adjusted the IAC valve on the throttle body to set the idle speed and it seemed to fix the problem. I replaced the IAC, TPS and EGR, plugs, wires, cap, rotor, still had the problem. 3 v6 it is surging real bad with a spuratic idle and stalling almost sounds like its missing i have alot of money in it fuel filter, idle air control ,tps sensor,map sensor, oem valve on the back of my throttle body i think its called, distributor cap,wires, and plugs tried to adjust timing no differnece looked at distributor rotor is new and looks like its Nov 6, 2017 · Ok, so I am new here, but I am not new to this truck. Ever since I bought it, the idle has always been a little bouncy at lights, but sometimes it goes down to 500-600 and feel like it may stall but never does, and goes right back up. Firstly, check for any vacuum leaks in the engine. 5 turns. ? 1: hot or cold or both. Customer: 1988 1500 5. Jul 24, 2016 · Ok, so it's still having trouble. Since then it has grown to be a leader among full size Chevrolet K5 Blazer and GMC Jimmy web sites across the Internet. See my post about Stanadyne. Warning lights: If an issue causes RPM fluctuations with the engine’s electrical system, warning lights, such as the check engine light, may illuminate the dashboard. I would assume if the exhaust manifold was leaking causing the o2 sensors to read the engine is lean and then more fuel is added, I would have more of a high idle surge as opposed to a low idle surge. it surges at idle and at a steady rpm cant figure it out. normal Apr 9, 2018 · Customer complaint bad gas mileage and a surging condition at idle, sometimes. Next, address any fuel delivery problems. 7 TBI. Checked the fuel pressure, good, 13 psi. It basically almost dies out, and then surges back to life (probably a little higher than normal idle), then repeats continuously until you apply some throttle. Jun 15, 2012 · mine would surge when the base timing was off retarded 8 degrees due to lack of tune up. 7 Tbi When At Idle It Has A Low To The Idle. So, a few days after purchasing it earlier this year it started a surge at idle. But the surge accelerating and self accelerating is what im trying to figure out. It cranks nice and fast but does not fire unless I tap the throttle. It would stall while sitting at idle in park or when in gear at a stop sign. The best way to determine if your idle air control valve is the issue is to check Customer: 1993 Chevy K1500 5. I then drove the truck another 15 miles to and from dinner Sunday evening, no problems. 1989 Chevy Reg Cab 4x4 Dana 60/14 bolt w/4-link front & rear and other full size Nov 15, 2021 · Truck is original and last year developed a miss/bad idle in gear. . It surges while at red lights, when in drive. Jan 16, 2021 · 4. 3 L engine surges +/- 200 rpm between 30-59 mph in final drive gearin lower gears runs fine. Nov 8, 2009 · It's my first GMC ever . Replaced distributor and all has been well since. May 16, 2023 · Having issues with it surging +/- 200rpm when it's in overdrive around 80 km/h if light pedal driving. 2L and got an issue with the idle being high and surging when off the throttle. 2L/6 spd, and sure enough, from the get go, same exact damn surging issuestwo different trannies, two different I'm dealing with an intermittent stumbling/cutting-out issue lately. I recently installed a brake controller and noticed it signals overload or short every once and awhile but I can’t find any visual signs of a short. When driving, unoticable. When I pulled them to do the compression test they all are lightly coated with black soot. Surging when it re-engages. Ran better, but still stalled. 060 over flat top pistons stock crank forged rods, the cam is . Apr 4, 2022 · Howdy, So I recently bought an 87' GMC SIERRA short box with the 350 TBI and When I start it, it surges bad and trys to die, and then begins to idle better but still not right it sounds like a misfire. As the idle drop it does 500rpms and sometimes as low as 40but will pick back up. My problem was the air breather hose just on the engine side of the MAF had come loose and it must have been sucking too much air at idle. And you can also feel it at a slow 1997 Chevy Silverado V8 Four Wheel Drive Automatic I Have A 1995 Chevy Z71 5. anything that causes the rpm to increase or decrease, such as a vacuum leak, egr flow, or misfire could result in the PCM changing the IAC pintle position resulting in surging. If I put in drive and try to keep it running the rpms will just go up and down hard then stall out. Also check your coolant level. Runs good but after warmup at idle it surges probably 300-500 rpm. After keying it on, it'd go through it's 2 second warm up RPMs then promptly drop to a very low RPM, surging for a balance till it would ultimately die within just a few seconds sometimes longer. Jul 28, 2010 · I have a 1993 GMC Suburban with the 5. Oct 19, 2023 · From there the VE tables can be adjsuted to the new parts you have added, then MAF tuning for the CAI, and finally last thing is idle. Aug 29, 2023 · Bad Idle Air Control Valve. It did this a coupe of times. So, the truck is a 92 k1500, has 20,000 miles on the new GM crate 350, new throttle body, rebuild trans about same time eng was put in. I have to really hit the brakes to stop it. Oct 31, 2010 · Alright, i had posted before about my surging idle. Feb 7, 2017 · Finally was able to find some carb cleaner and test for leaks. Oct 11, 2010 · The idle will sound like its got an extremely large cam in it. The truck went from 600 rpm to 500 and then came back up. 7 tbi when at idle it has a low to the idle. a little history on the engine i built its a stock block thats . Location: Main Index » Forum Index » Trucks-Vans-SUV » 88-98 Fullsize Trucks, Vans, Suburbans, Blazers, Tahoes » 1989 chevy tbi 305 surging idle, wants to die FusionBB™ Version 2. As you monitor the lab Jul 28, 2009 · so it surges at idle. Jan 6, 2015 · First, I'd pull codes and see if it has anything, even if the Check Engine Light isn't on. Mar 18, 2017 · Hello all, this is my first post on this forum. 3L V8 developed the same rough idle on start-up so many others have reported. Surging idle can be caused by a number of different problems. It fires right back up very easily. this is most often caused by a vacuum leak. Nov 18, 2018 · Chevy Truck Tech Forums. I started using Stanadyne again and it seemed to go away. Shifting to drive is fine and the surging stops. May 13, 2012 · The truck is actually idling much better than before, but still has this "loping". Fixing Surging At Idle. We have replaced the FPR twice with no change, while watching the truck on the computer everything is great all injectors are well within spec and fuel pressure is dead on. I have also replaced almost all of the sensors, as well as the cat. So not sure if it’s related. Unplug the CTS runs perfect. Truck Trend Garage: 2004 Chevrolet Friends, I am desperate, I tried everything I know and more but I cannot find a solution to my Loping idle and surging acceleration on my '90 Sierra C1500, 5. 509 lift Apr 28, 2020 · Sometimes it will idle smooth, sometimes it drops to 6-700rpm then dies, if it runs smooth and I put it into gear, it dies immediately. Aug 16, 2012 · 6" Zone, Lowering keys, 2" Blocks, 20x10 -21 Eagle Alloys 33/12. I have set idle mixture screws to factory recommended 1. & Dec 21, 2008 · Before all of the this it was pissing oil all over the place, surging and running rough at idle. If you’re noticing that your RPM are constantly going up and down, even when you’re not accelerating, it’s likely that you have a bad idle air control valve. 3L) did the surging at idle (feels like the guy behind you tapped your bumper!) and the surging while coming to a stopand that had the 4L60E transnow I have the '10 truck with the 6. 7L V8. I recently picked up 99 suburban with 135K clean body with a 454 that was running rough. 7L TBI intermittently stumbles/stalls at idle, and frequently falls flat on acceleration down the road. 3-liter was a surge at idle when warmed up. Oct 7, 2010 · 1988 Chevy C-3500 2wd (no pic) 350 c. Jumpered the ALDL, got a code 33. 4 k3500 truck that idles rough. This thing is a pig, and acts accordingly. After warmup it surges in idle. Jun 22, 2012 · Question:My original problem with my 2004 Silverado 5. IF I go into reverse during any part of the surging the surging will change usually to normal “idle” or will surge to a lesser degree than when I was in park. Before I went on a parts cannon approach, I checked the MAP sensor - it was plugged in but the vacuum line was somehow disconnected. May 6, 2021 · I would like some help figuring out what is causing my truck to run like crap. Sep 21, 2015 · 2001 S-10 LS, Ext. Sunday I drove the truck between 75 to 100 miles with no problems. The most common cause of a rough idle is misfiring. Reconnected the line. 3 engines, which can result in poor idling, engine stalling, bad acceleration, and other low-rpm running problems. The truck is a lbz has EFI DSP5, FASS165, EGR blocker plate on the up pipe, and MBRP 3-inch down to 5-inch exhaust. Engine should idle normally after 3 minutes. Transmissions are very Interesting on how they behave when they're having issues. New Jul 11, 2011 · I have a 95 chevy 1500 4x4 5. Problem: excessive corrosion internally on the Engine Coolant Temperature Sensor terminals. Varied. - having accessories running makes the surging more intense. Cap & Rotor & Fuel Filter. It does not do this constantly, but I would say almost the majority of the time. A scan returned no Apr 15, 2021 · Alrighty, so I have a 1995 k2500 Silverado with 350 tbi. Stalling, surging, or hesitating while idling all can be caused by this unassuming sensor. I have been lazy lately and not used it and it seems to be coming back. Once I got it started the idle was super high. Sometimes after 10 or 20 seconds the idle will stabilize. I did encounter some other problems, fuel leak, trans cooler line leaks, and a shifter cable gone bad. 7L with 60,000 original miles. Models: 2009-2011 Chevrolet Express, Silverado, Suburban Jan 16, 2018 · 2005 Cadillac Escalade ESV 6. Jul 2, 2021 · Then it starts surging from low 800s to 1. 5K. Jun 20, 2006 · In May of 1999 CK5 started out as a tribute to America's favorite 4x4 utility truck. i have replaced the egr value intake gasket water pump fuel pump fuel filter coolant temp sensor idle air control value mass air flow meter clutch fan tps sensor plugs/wires coil pick up in the distribter rotor button/and cap fuel psi regulator belst/hoses complete a/c system May 20, 2010 · Exhaust- I think every Chevy truck in my home town has a performance muffler on it, I just couldn't believe it would be my problem (plus a quick chat with my favorite muffler shop that went like this- "blah, blah, blah" (me explaining problem), they said (and I quote) "what a load of *****, look for something else". Spraying carb cleaner seemed to have no effect on the engine speed. Typically 2 problems. This is with and without AC. Apr 19, 2010 · I have a 1995 chevy pickup 2500 series. I've been all over this truck since I got it a year ago and my head has been itching over it so much that I've developed a balled spot. No trouble codes and the rough idle only lasted a few seconds. Location: Main Index » Forum Index » Trucks-Vans-SUV » 88-98 Fullsize Trucks, Vans, Suburbans, Blazers, Tahoes » 94 Chevy 1500 fluctuating idle FusionBB™ Version 2. 7L TBI surging idle, lacks powers and runs better with MAP unplugged FusionBB™ Version 2. The truck runs rough at idle, though smoothes out as the rpm's rise. It ran ok, but was in need of a tune-up. Never did it idle in gear. Found the body to motor ground strap broke, and ground on back of passenger side head loose. Lets start with the high idle. but it runs great when accelerating or about 60mph and faster almost like nothing is wrong with it. 7l TBI truck. I've seen multiple times the ICM (Ignition Control Module) will wig out once the engine warms up after a while (don't use Chinese junk parts). From what i have read through your long list of stuff, you just need to find a reputable tuner to go through your tune. 7 Vortec surges very badly at idle. Monday when I started the truck the high idle issue has returned. Short was telling truck to dump full fuel in the injector(s) affected causing it to idle harder than an old cummins and surge. Can be felt slightly while driving. with the base timing set right, new cap, rotor and new plugs fixed my rough idle. My 2013 Silverado with the 5. Save Share. first off, idle is the last thing to work right on any engine. The truck has been running great and this morning (after a day of not driving it) I had to jump it. It starts and dies first thing in the morning. there are many ways to find what is wrong. It doesn't have a tach but I would say at least 2K. when I put it in gear it bogs down and will sometimes stall then the idle comes up a little bit and continues to run rough. While driving down the highway, without cruise control on, my truck sometimes surges, or seems to loose power for a moment and then catches back up. 1994 S10 P/U 4x4 4. I have a little update. Sputter/bog on acceleration, smooths out backing foot off the gas and at higher RPM. Oct 24, 2014 · The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board: surging idle, has to be something simple Feb 14, 2010 · Short in the wireharness, look for the icepick fix or one of the others. 1967 Chevy Chevelle - Tubbed, 454 BBC, 400 turbo with manual reverse valvebody, narrowed rearend. My issue: my son has a 1989 chevy Silverado; 350, auto trans. Watching the tach it will go from idle at what looks about 800-900RPM down to 200, maybe even 100 almost sounding like it will die, and then back up again. I know it sounds dumb but a low coolant level will cause exact symtoms; surging idle with brakes on and high idle without brakes on. While cold with the idle still on the high side it seems smooth and normal. 400 to 800 RPM? surge. Fuel filter has been changed. I've since replaced the spark plugs and wires, distributor cap and rotor button, and alternator. There was a vacuum leak, too, but it was in the line going to the vacuum reservo Oct 19, 2014 · The truck started and idled fine. In the guide below we show you the most popular issues and how to fix them, EV's also have surging issues which we address in this guide. 3ltr engine and 119000 miles. 2008 Chevrolet Silverado 3500 LT crew Nov 30, 2011 · Surging at Idle? Jump to Latest 2005 Chevy 2500HD LLY CCSB hypertech, gutting the exhaust. 3 Vin W Cold Air Intake Dual Flowmaster 40 W/O Cat. About 160000 miles. The idle control valve (“ICV”) and throttle position sensors (“TPS”) are prone to failure on all 4. 2 and a "stage 3" cam. the garage changed the 02 sensor and the 4 pin solenoid on the throttle body. When i put the truck into gear and take my foot off the brake, the truck will accelerate to around 20 mph on its own. I have searched every where for this answer and I cannot seem to find it. The best way to determine if these issues are caused by your throttle position sensor is to go to the source. Unplug the MAP Sensor and the problem goes away, I replaced the MAP Sensor with one from Autozone, and that didn't fix the problem. Jul 12, 2012 · 2014 GMC Terrain SLE - 3. Do a search on the forums for the icepick fix. i. Customer: my truck surges at idle, and when in drive with the brake on it wants to jump a bit like someone is tapping the accelerator Answered by GM Tech (Cam) in 5 mins 8 years ago GM Tech (Cam) Jun 2, 2008 · My father in law's '91 Chevy was running poorly, so we put new plugs, wires, cap and rotor on it, and it's running better, but it it still surging at idle. 7L 350, TBI, Auto, 220Kmiles Its been a great truck, for the most part it runs and drives great! but at low idle or low rpm's it missis,sputters,surges and if im just barely giving it any gas it almost wants to stall out. Enough to make the radio antenna dance pretty good. After having performed the relearn procedure and the engine still does not run within normal idle speed, it will be necessary to drive the vehicle above 45 mph (70 Km/h) including several decelerations. It still has its surging in gear, park idle its smoother. Here is an update. IAC, EGR, EGR controller, MAP, temp sensor, vacuum leaks, O2 etc. I replaced the plugs, wires, cap, rotor, and air filter. Mar 9, 2022 · An engine or motor surge is caused by an imbalance in the computer system which cannot be corrected within the parameters of the vehicle's operating program, in other words there is a mechanical problem. Replaced the distributor and problem solved, the truck was running great! Mar 11, 2012 · Ever since then it surges really bad at idle, was backfiring through the tbi (running lean condition or timing), and would barely run. Jun 14, 2013 · So, the truck was still acting terrible at idle. It's up and down about every 15 seconds. Loose hose, loose fitting, cracked assemblies Jul 16, 2011 · Oh ok well it runs fine at idle and then when you go to accelerate it hits 900-1000 and it surges, it kind of sounds like the engine is gasping for air it almost cuts out and then comes back when you speed up past 900 or when you come to a stop sign and sometimes but not very often it almost cuts out and then comes back. 0 AWD 152K miles Previously Owned Suburbans; 1999 GMC 2500 Suburban 1997 1500 5. I would scan this in if I could, so I'll type it for those that may have the same proplem, or for those who need/want it. Mile truck maybe 160* when i started the truck the idle dropped to 500the in park instantly and stumbled when put in gear. Cab, 4. After about 10 mins it will idle normal and maybe eventually start surging again if I leave in park the whole time. 350 engine. Jump to Latest It only surges at idle. 5. I noticed tps was at 0% at idle but pressing the throttle slowly it moved up to 100% at wot. My truck idles fine in park at about 800 rpm's. 7 L Stock Block, 4 Bolt Mains L-31 Vortec Heads, Edelbrock Cam & Intake, Holley 650, Flowtech Headers, Magnaflow exh. I just rebuilt the engine with new rings, pistons, bearings, cams, rockers, lifters, valves and timing. Revving seems normal. 7: while driving truck it started bucking, rpms rapidly going up and down. Mar 8, 2018 · Fuel pressure is good. After 2 or 3 times of that it will start surging until it reaches operating temp. I need help to figure this out. If I unplugged that tan wire w/black stripe, it wouldn't die. 7L 4x4 3" lift 35" tires 1990 1500 5. As for the PCV/Vacuum, well, anything. As IanDV has said, this is normal, obviously by design and after a minute or two, the engine will lower it's RPMs back to it's usual 800-750 RPM idling range. This is my first time owning a diesel. this thing is surging and its always a 50/50 chance of it stalling out when ever I come to a stop or get into reverse, it has just under 238k on the engine and its only does this at idle when i have my foot on the gas pedal it doesn't surge at all but once it idles or its just sitting Dec 28, 2011 · I've got a 2007 Silverado 2500HD 6. Jul 23, 2019 · This is a 1990 Chevy K1500 with only 100k on the dash. . Stalling or difficulty starting: In severe cases, RPM fluctuations can cause the engine to stall or make it difficult to start the vehicle. Customer: 1990 C1500 TBI 5. In this article, we'll look at some of the most common causes of a rough idle in the Silverado and how to fix the problem. Jul 12, 2011 · i have a 99 dually 4door 4x4 7. There are several steps you can take to fix this problem. A bad idle control valve can also lead to fluctuations in the RPM. Jan 21, 2018 · intermittent high idle intermittent surging at idle Warmed up, slowing down for a stoplight or something, it does not want to idle down. Aug 4, 2019 · Clutch slip. 7 Cummins engines. Seems i have to shove the pedal down some to get it to down shift and increase speed, then it wont do it as frequent. 2001 Suburban LT 2WD, 5. 3L, 4L60E, 3. Something this morning caught my attention i drove about half. There are no codes. 7L 4x4 6" lift 35" tires Nov 13, 2022 · It idled nice and strong. No surge or feeling like Sep 3, 2007 · Re: 95 Chevy S-10 4. I checked the manifold and vacuum lines again and everything is hooked up tight. 39,000 miles. Park idle is 700 rpm. Wire went bare and shorted out on bolt. Bought a can of throttle body cleaner and took off the throttle body (TB). CK5 has since expanded to include the classic C/K series GM Truck and Suburban as well as past and present GM models. It cranks for a while and spits and sputters then usually dies, if not it runs rough with surging idle. I did not drive the truck too far Saturday. Mar 5, 2020 · I have a 2008 Silverado that intermittently has starting issues. With this issue, the first thing that comes to mind is throttle position sensor/idle air control valve. May 25, 2024 · Is it a car stage 1 or truck stage 1 or a turbo stage 1 or a supercharger stage 1. - when surging, If I hold throttle steady ie 2000 rpm in park or neutral tach will surge up and down a bit. 5/20, 2" BORA Spacers Built Motor: Fingers, Carillos, NGM AF Cam, Ported Stock Heads, Trend pushrods, Billet Rocker Bridges, ARP 625's, HSP Twin Kit S484/Danville 68r1, PPE Dual Fuelers, 125 overs w/ Billet Hold Downs, 5" straight pipe, Mishimoto Intercooler, PPE manifolds and up pipes, PCV reroute, Airdog 2 165, Rareparts and Feb 6, 2015 · Ok here is my issue I have a 1993 k1500 with a 5. I let it idle for 10 minutes or so and nothing. If it's surging, it might be having issues with the MAF sensor readings or O2 sensor readings, like it's chasing itself with how much fuel it's giving it. 5 lly duramax. You would slowly back up but the surge would just rush you back. This truck has about 2500 miles on it and for the past couple months it has randomly started surging or fluctuating RPM's at idle. When it gets to operating temperature and the idle drops more it is more noticeable. Number 5 reads 95 +- 5. 0 engine Mechanic's Assistant: What is the model of your '88 Chevy? May 24, 2009 · It was horrible to try and hook up to a trailer. Apr 25, 2021 · I had some surging about 6 months ago but it wasn't this bad, I didn't get codes, and it magically went away for the most part. 0 Vortec with a PO300 random misfire/rough idle issue. Dec 19, 2012 · When the truck first cranks up it will rev a bit higher than idle for a bit to warm up the engine to a more normalized operating temperature I assume. You will see in the video that it drives great, just drags at idle. Surging Idle needle moved up and down with RPM. Does it with or without AC on. I look forward to hearing from you, I live out in San Diego area. only Aug 27, 2023 · It runs smooth on the road or at idle while in nutral, but at idle in gear it surges and bucks. It's been running good/bad for a few months. Dec 3, 2012 · So, I checked the spray pattern today and it appeared to be normal. It produces no codes I have watched it with a scanner and all the functions appaear to be operating properly. Truck isn’t running rich, CEL is off but the idle is rough. IAC valve is used to maintain correct idle speed. Aug 8, 2010 · so the last few weeks ive noticed that my truck would surge at idle, and i can hear the turbo vanes close then open back up. 7 2wd, and was hoping somebody had some guidance here. Chevy Silverado Forum (GMC Sierra) It's just from an idle, typically at a stop light. I got the truck last week, they said they just swapped the motor, but had said issues. it's usually not that bad just annoying. No codes, no other problems. In this application I ran it for over 6 months until I changed the 28PSI spring to an 18PSI one set @ 15PSI to run 7. 265/75/16 Firestone Transforce AT, oh its my first truck with leather. I have the dizzy timing advance connected to timed vacuum port on carb. Location: Main Index » Forum Index » Trucks-Vans-SUV » 88-98 Fullsize Trucks, Vans, Suburbans, Blazers, Tahoes » 94 K1500 350 TBI cold start has erratic idle FusionBB™ Version 2. No surge on cold start, but once it warms to operating temp. Once at a stop, it is around 1,000 RPM then eventually settles down. Mar 1, 2012 · Looking for some help to resolve an issue I'm having with my 2003 Chevy 1500 Z-71 with 5. When I make a turn at a really low speed and my foot is off the gas, the truck dies. 0L or 6. Dec 18, 2020 · Neither way of starting it effects the surge from what i can tell. 6 Direct Injection V6 (for my wife) 2019 GMC Sierra X31 - 5. Which I'll never go back, lol. Aug 7, 2017 · Hello! I'm new to the forum though I have looked at some other threads. I've read most threads on the subject (much appreciation!), and will try some more solutions today. 7L TBI, I've replaced the Timing Chain & Gears, IAC valve, TPS, MAP, EGR & Solenoid, ES Module & Knock Sensor, ECS, Ignition Module, Plugs & Wires, Dist. Dec 6, 2022 · Chevy Truck Tech Forums. With the map unplugged it does not surge at idle and the truck runs well. It is not as bad as it was but the last time i started to with a slow Apr 22, 2011 · I have a 1992 Chevrolet K2500 350 tbi that idles high about 1200 to 1500 rpm sometime's will idle about 800 rpm. 3L TBI - Idle troubles Hello MT, The truck has electronic ERG. It still needs starter fluid to start, but it actually stays running now. In gear idle is 650 when it stabilizes, but drops as far as 350 in a regular hunt that oscillates every 3-4 seconds. A hickup idle, also refered to a as a surging idle, are symptoms of it. When it is doing the surge at idle you can lightly mist some carb cleaner over the throttle body and it runs perfect. its a 1990 chevy k1500 with a 350 tbi engine. Had at two different dealerships, and no one after every Nov 15, 2007 · I fixed it by lowering the idle to proper level using the screw on the throttle body. Surging at idle is a common issue in 6. Dec 16, 2009 · The surging / misfiring happens at acerattion and contunies have to hold trottel to floor and stay in lower gear to keep the truck moving. Jul 31, 2010 · Vac test. Could be worth checking in your case,its free Figured this could be very useful if someone else has this problem. I drove it a couple of miles with a mix of moderate acceleration and WOT. I can rev it up and it will idle normal for a second and then go back to doing that. When the map is plugged in it does the surging again. 0 engine that surges up and down at idle Mechanic's Assistant: How many miles are on the Chevy? What size is the engine? What size is the engine? Customer: 132000 with 5. 7L 145,000mils. I have a mild cam. I have a surging/stall problem. Converter slip. 7l With 250,000 Miles On It. ie A/C lights on etc. My problem is the truck surges at idle. 7L will not idle You need to do an ohm test and then hook up a 9V battery to check the IAC, the plunger has to expand and retract as you reverse polarity. any thoughts? Jul 24, 2017 · Hey i have a 2004. 1 I have a 1995 Silverado (K1500, V8, Automatic, 231k miles) I am having trouble with the truck all of a sudden. No codes. Replaced wires, plugs, distributor cap/rotor, tps, ignition module, map, IAC, engine coolant temp sensor, rebuilt fuel pressure regulator and new al Jun 30, 2011 · I took it in on 10-05-2011 and told them that it continued to do the engine surge problem. 6 to 12K. When you unplug the map sensor it runs ok but smells rich. Surging at idle/rpms up and down then dies 36 Answers. Had a rpm drop of 200rpms when coming to a complete stop, and idle surging also, which would cause the vehicle to lurch forward, almost hitting curbs and cars at lights. 3L, 6. Customer: i have a 93 chevy 1500 4. Aug 12, 2019 · It s/b 9 - 13 PSI (according to GM specs), at idle and under acceleration, preferably 11 - 13PSI. After reading dozens of forums with multiple ideas I went with the cheapest/easiest first. The idle was stable with the 450 carb but now surges with the 650. 4 (80LB/HR) injectors, took it all apart, re-taped the fittings, and put it back together without any issues. TBI being a MAP sensor based system will see the leak just like opening the throttle blades and will feed the leak and then you have a high idle. anything off idle it runs perfect. The truck ran good. - in N or P idle rpm slowly drops to 200-300 rpm then engine "catches" up and rpm shoots back up to normal idle and continues surging. Sep 23, 2018 · Its the FPR on the CP3. Anyways, to the point. Replaced wires, plugs, distribu Jun 9, 2019 · Truck Year 1990 Truck Model V 2500 Suburbans 1990 Suburban manual transmission 5. So the issue is it starts surging when coming to a stop and sometimes stalling after driving at highway speeds, like taking an exit off the interstate. Location: Main Index » Forum Index » Trucks-Vans-SUV » 88-98 Fullsize Trucks, Vans, Suburbans, Blazers, Tahoes » 1990 5. I just replaced the Idle Air Control valve because i was told that could be it. 2L AFM Equipped Engines (RPOs LMG, LC9, L76, L94) and 6L80 or 6L90 Automatic Transmission (RPO MYC, MYD) Feb 20, 2012 · I just removed my 450 holly and installed a 650 edlebrock on my chevy 350. Nov 2, 2010 · The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board '89 350 tbi 5 speed stalling and surging idle Oct 9, 2010 · Re: 1990 chevy silverado 5. 3, V8 311,000 miles, leaks oil now at rear main seal stock 4L60E on 5th filter/fluid change; 2nd set of drive shaft u-joints; rear diff new bearings; 2nd fuel pump and fpr; ABS pump circuit solder reflowed; 4th water pump; 2nd fan clutch; new front wheel bearing units; new front and rear shocks; 1000# rear air springs, Brake fluid Apr 19, 2015 · The truck started surging at idle and is real bad when in gear only while stopped, but it runs great as soon as your on the throttle. :chevy: Jan 20, 2018 · My '89 350 TBI truck would fire up and then immediately die when the idle went any lower than 1000 rpm's after changing the plugs, wires, rotor & cap. It now has a new fuel pump, distributor rotor, distributor cap, spark plug wires, and IAC connector. Also ensure that after driving the vehicle, let the engine idle for a minimum of 5 minutes. Next, I noticed that the distributor was making noise, bad bearings. I was told that cleaning the throttle body should fix it. It will go away and come back depending on when the thermostat opens and coolant hits the sensor. Nov 25, 2014 · Base idle is set by the PCM using input from various sensors. Customer: I have a 1994 chevy 5. I have checked for vacuum leaks and found none. It hesitates and shakes when the gas pedal is barley compressed. What an Engine Needs to Apr 20, 2024 · 1. Had a guy bring me a chevv SS retired police car with a 6. Mar 1, 2017 · hello 3 years ago i started this project. I just got it a week ago. The truck starts fine when cold or hot. By visual inspection you only see carbon build up but and clean the idle port hole thats about it, you need to find out if the IAC motor works properly. 1 ©2003-2006 InteractivePHP, Inc. Sometimes when you put it in drive or reverse (especially reverse) it will stall out. started very light but I currently get a constant surge of approx. No surging, nothing. Nov 24, 2010 · I have a 91 Silverado K1500 4x4, 5. 3 1995 Chevy S10 - V8 V8 four wheel drive automatic 206,000 miles. Nov 21, 2013 · Hey everyone, I have a 97 dime with the 2. When I tried to drive it, it would buck when going into gear and die when I was coming to a stop. If I try to drive, it starts out ok then after 50 yards or ao the motor stutters and canno accelerate. "#PIP4828:Rough Idle and/or Lack of Power on Acceleration After Cold Start. May 24, 2017 · Driving my truck to work today I noticed a slight surge at idle. The truck is surging and sometimes missing but when it does smooth out and idle (usually a fast idle) as soon as you put it in gear it dies, "Gotta love a Chevy Truck!" I Drive'94 Chevy Silverado 3500 4 door Dually long bed with 6. if i unplug tps is mellows out but still there i have a dynamic efi computer that i use tuner pro to tune it with. Rough Idle and spark knock, have done the following, Timing chain and gears, re-timed, cap, rotor, plugs, wires, EGR valve, EGR valve solenoid, fuel filter. When mine was surging, I saw idle pressures bounce from 5. i make sure that the engine holds closed LOOP status. No check engine light or computer code generated until recently which showed that bank #2 was running lean. Same issue we had with our 2004. Feb 20, 2011 · My 2006 Chevy Silverado 1500 5. Rpms drop to where the motor almost dies then surges back ip to normal for a few seconds, repeat cycle. It is so frustrating. Idle surge or idle hunting and high idle. ICV and TPS Failure. Feb 2, 2011 · My 98 surges at idle when in gear, but not while driving or in neutral. I ran compression tests and all cylinders except #5 read around 105 - 110. 42 2011 Camaro SS 2SS/RS 6-Speed Manual Victory Red w/White Rally Stripes Flowmaster Outlaw Catback Jun 30, 2011 · David 2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Throttle body spacer, Spintech exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer AT3) and 4. 5. After 2 years and having the burb at 2 different shops with no result to the surging idle, I stumbled upon the answer at a Ford site. Ended up being a baby truck cam instead of the car cam. If you have a device you can plug into to watch the rail pressure, you would see it bouncing at idle. and it will just sit there and do that. Those are fixed other than the trans lines. The truck has new wires, cap/rotor, plugs. If I try to push on gas it eventually would backfire and smelled rich. Jan 11, 2024 · I disconnected the Idle control solenoid, started the truck, ran the engine at around 1200 rpm for about 2 minutes, and it actually idled at a low rpm with no input from me until the engine warmed up to operating temp then it would no longer idle without surging or throttle input. It Flacuates Between 350 And 1000 Rpm. It was considerably warmer tonight when I did the test, probably about 65 out, and the truck seems to run much better in the warmer weather. Chevy C/K Truck Forum 96 K2500 454 4x4 Suburban surges when warm. 200 rpms about every 3 to 4 seconds. Mar 25, 2014 · The vehicle idled fine, no Service Engine Soon, and no codes. 1000 to 2000. ? 2: low extreme RPM and high at idle. see what im getting at? Thats the main reason i hate stage numbers. it would help to have a scanner that could read the data stream and see where the IAC counts are. Mar 30, 2006 · I have replaced mine, and my truck still surges at high idle, first thing in the morning when the engine is cold enough for the truck to try to do the automatic elevated idle. It flacuates between 350 and 1000 rpm. Putting it in drive fixes the issue. System is going lean, and after 20-30 seconds of running lean, then goes into open loop forever. This morning the truck drove great with only a few light stumbles, on light acceleration, as I went to church. Coming home, it had a rough, surging idle on startup, and a lot of stumbles all the way home. I has so far replaced distributor, cap, rotor, plugs, wires, cts, iac, o2 sensor, map sensor and tps. Might not even be that, but I've experienced surging with a bad transmission. When i first start the truck it slowly rises from 1000 to 1500 rpm then comes down after five minutes to 1000 rpm then when i drive it for a few minutes then it starts idling at 1100 rpm when the truck is in drive. the surge begins. K1500 model. Watching the fuel pressure at idle stays around 5200psi and when it surges up goes to around 9000psi. Once the engine gets to around 110-120 the rough idle/RPM hunting behavior begins. Come join the discussion about Silverados, Sierras, and other full size trucks performance, modifications, suspension, lift kits, tires, maintenance, and more! Feb 17, 2020 · I don't know, I've used this stuff on lots of different applications along with PTFE (Teflon) paste on others. Seems to sputter bog more on longer test drives. One time, it did completely misfire and limped back to my shop. 150k miles on the truck. Jun 15, 2011 · -Jon-1998 Chevy K2500 6. All plugs are new with only about 5 mins on them. Yesterday morning, it was 39F and it started and idled at 1000rpm(i assume this is the elevated idle setting actually working) and held there. Jul 31, 2013 · 2010-2012 Chevrolet Avalanche, Silverado, Suburban, Tahoe 2010-2012 GMC Sierra, Yukon, Yukon XL Equipped with 5. Nov 20, 2023 · 3. 1992 Chevy K1500 5. 6 that has developed at surge at idle. It will start right up and idle ok in park but as soon as I put it into drive it stalls out. Similarly, if your engine struggles to idle efficiently, it could also be a result of a damaged throttle position sensor. Very clean truck. Mar 20, 2017 · I read the site all the time to troubleshoot for some of my older LB7 trucks. 7L Idle is surging when warm. when the truck warms up the idle surges up[ and down. These leaks can cause an imbalance in air/fuel mixture and result in surging. My '98 K2500 with the 5. I bought two 2016 Chevy 3500 Diesels off the lot in November (well two different dealerships, long story). Jul 15, 2005 · Ran across this old post of mine and figured I should wrap it up. Holdind the trottel down and mantaining 3000 to 4000 rpm can keep memoving, with traffic Customer: I have a 1988 Chevy pickup 5. questions. Mar 1, 2014 · Immediately after, the truck would idle at 2500rpm but over the course of the day, the computer was able to adjust the idle back to normal. fix idle surge way. Feb 3, 2010 · I have a 2004 Chevy Duramax 6. 00 later an … read more Oct 8, 2020 · 2008 Sprinter 2500 170 - camper van. Truck Doesn't Idle Well, No Power, Surges, And It's Aug 30, 2019 · If you own a Chevy Silverado and it's idling rough, you may be feeling frustrated. Nov 25, 2022 · Yeah, been complaining to dealer about both of those situations for yearsmy 07 Tahoe (5. 5 Turbo Diesel. Sometimes the idle would dip low briefly, then recover as I came to a stop. First I checked al the obvious things,like loose vacum lines or wires. 5L vin F, 200,000+ miles Military surplus engine cast date 10-21-2005 installed March 2011 SS Diesel PMD and heat sink relocated to front bumper with SOLDERED HARNESS Sep 2, 2008 · 1993 Chevy Camaro Z28 - K&N, flowmaster, 150 shot NOS, modified 4L60. I am uploading a video of what the truck does while driving it. It's not leaking oil any more, but it's still somewhat rough at idle and surges on acceleration, When it's idling rough. Surging is 100% in the tune. Apr 11, 2023 · New member here and I'm looking for some help solving an issue with stalling and surging idle on an 1996 chevy silverado 5. I keep a small scan tool in the glove box so I hooked it up and monitored the data. Like. So far ive done a complete tbi rebuild kit so it has a new fpr diaphragm, tried different fuel pumps with no difference (pump gets 13v), swapped MAP with known good one, blown out both fuel lines, new fuel Oct 31, 2015 · I just got thru fixing the exact problem burhead. 4l ecotec vvt. I had the exact symtoms as you,but my CEL flashed and gave me random/multiple misfire code. 1993 Chevrolet Truck Surging Idle At All Temps Ok Here Is My Issue I Have A 1993 K1500 With A 5. Did some research and replaced the Idle Air Control Valvestill stalls. Appeared to be water in the old fuel filter did not see any in the new filter or in a sample pumped from the tank. My idle is surging at startup but it seems to go low rpms more often then high. The actual cam specs are whats important. 10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation. It was a farmers truck that had deceased and the truck sat for a few years before the wife was ready to sell. I have a 1985 Chevy Scottsdale C30. 1980 GMC playtoy - 12" lift, 468 BBC, 40" Groundhawgs, modified 400 turbo. Aug 27, 2023 · I have a 2013 chevrolet equinox 2. $250. xfwjs trxu iwvywl oopezpq yqwgk tws zjxp xdgbtd ogdar iwjpwk