1991 chevy 1500 rough idle. It would stall while sitting at idle in park or when in gear at a stop sign. Any ideas. Nov 21, 2009 · Sounds like you have an issue with the IAC. V8. Spark Plugs. When one or more of these variables is off, it can lead to a rough idling condition. SOURCE: 96 Jeep w/5. They can cause gas leakage, rough running vehicles, a strong gas smell inside of the vehicles, and it can be a potentia Oct 17, 2012 · Need a little help. the injector pulsewidth would be 1. Along with the erratic idle, the engine has absolutely zero power. Changed EGR valve Oct 15, 2013 · Hi, I have a 1991 6cyl Chevy PU. Runs rough at idle and on acceleration at times. I give it a little bit of gas, and it seems to stop shaking (maybe 800rpm). 34 % of the time it's the. Engine runs rough, idles down to 500 RPM or dies at a stop light. I put it into neutral most of the time at a stop light. When I observe the timing (EST wire plugged in) during those rough episodes it is rather wobbly, like the ECM isn't consistent with the advance, always changing by four degrees retard or further into advance. When I started driving Wednesday there was a bit of a rough idle and the Service Engine Soon Light illuminated. 3L TBI 4x4. Once I start driving, the volts go back up to about 13. I have an 1994 GMC Sierra 5. And when the EGR valve gets stuck open, it'll cause a rough idle condition that may hard to diagnose. 1 Answer. Of course the RPM drop is in sync with the rough idle. Re: extream high idle problem on 1990 chevy 1500, 4. not consistent. When your done with the IAC hook up a fuel pressure tester and test the fuel pump, the readings should be somewhere between 12-15 psi. The control module controls idle speed with an idle air control (IAC) valve. 3 W CPI idle rough & stumbles. I slid under it to check the connections to the O2 Sen. Jun 22, 2011 · 2 posts · Joined 2011. Apr 9, 2018 · Customer complaint bad gas mileage and a surging condition at idle, sometimes. It fires right back up very easily. 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). Solution: Proper periodic servicing of the PCV valve will prevent this situation from occurring. Hook the black lead from the volt meter to A and the red lead to C with the sensor unpluged. #1 · Apr 27, 2010. Find parts for your 1990 Chevrolet K1500 Check Price eBay. If you smell fuel, Try locating the source. 1 liter 496 ci, 4L85e, 3. It got so bad that it would cut out at traffic lights. Here are the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk Nov 27, 2017 · A PCV valve leak can cause the air-fuel mixture to run too lean, and this will cause a rough idle. A rebuilt 350 was installed by a certified mechanic. Runs fine in town. Sep 3, 2007 · 10 posts · Joined 2007. Start cold and let it warm up. 1997 Sierra 6. Sometimes the RPMs will drop below 500 in a kind of rhythm, dropping every 10ish seconds then rising back to 500. Jul 24, 2016 · 1995 K1500 5. 1995 Chevy C1500 V6 4. All sensors on the throttle body are new, tps, map sensor, iac, new fuel pump, new fuel filter. com Feb 1, 2011 · What causes rough and surges at just above idle in a 1991 Chevy 1500 with - Answered by a verified Chevy Mechanic. 7: while driving truck it. Nov 24, 2010 · 5. Unresponsive to gas peddle at times and has major dead spots. problems so far: injectors shot turck was pissing gas the second the lines pressurized. 1991 Accord LX manual trans. (about half the time) My #1 cyl spark plug shows signs of oil burning (oil on plug). If I try to push on gas it eventually. This will work for the chevy blazer and also the chevy S10 AKA Chevro Jul 12, 2015 · 4 posts · Joined 2015. Once it is warm, it runs good unless you try to accelerate real fast. Idles a little rough. Jun 14, 2013 · 91 S10 Surging/Bad idle. The truck idles at the RPM it should, but there is a noticeable small jolt / shake that happens once every 1-2 seconds. rough idle, stalling, loss of power. If I give it too much gas (equiv to revving a 1100rpm), the engine stutters a bit, then stalls. Had this problem with my 95 Tahoe 350 at one point and the failed coolant sensor ended up being the issue. 7L) This tutorial addresses a very common problem I've seen on the 1987-1995 GM 4. Sep 20, 2020 · j cat. It is completely computer controlled via the Idle Air Controller. Should be around 1-1. Oct 12, 2011 · failed FP relay will cause no start at all, no fuel pump prime up with key in run position. Greg. I have a 1991 Chevy 350 5. Feb 26, 2008 · 226 posts · Joined 2007. I have done all I can think of to this point and need some others opinions. When not dying,runs rough cold/hot,no mechanical issues. It would surge some, and the gas pedal felt intermittent. Good afternoon. May 18, 2022 · Sometimes my truck idles real choppy and other times like this morning, it's smooth as polished glass. Very clean truck. The truck runs at speed with no noticeable fluctuation in rpms or idle, however at a stop light or in park it idles rough to the point of dying (which has done a few times). When cold starting the truck, it will go through the normal warm up cycle and then the idle Jan 25, 2009 · Terminal B is the signal to the computer. 07 Silverado Duramax. The computer tries to run the timing as advanced as possible without the engine pinging and the exhaust gas is its tool for doing that. Although you won't see this often, an engine rough idle can be a sign of problems with the fuel pump or fuel pressure regulator. i have a 2003 s-10 extreme with 4. The most common reasons a Chevrolet Silverado 1500 has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. Drives lovely. I can hammer it and it takes off fine. Changed O2 sensor - no help. This may include a bad fuel pump, a faulty fuel injector, or a clogged fuel filter. be sure to clean the IAC passage really well and be sure it can seat up tight. May 28, 2017 · The rough idle is very obvious while in drive at a stop light, when it neutral is drops off a bit but you can still feel vibration, in park it's the same as neutral. 7L engines with throttle body fuel injection system: a stuck open EGR valve. 08-03-11 01:03 PM - Post# 2121334 Ok the other day the wife was driving the truck and it started idling poorly and dying. Fuel Pump. Then it will rev way up and back down to almost stall and sometimes it will stall and I half to restart the engine. I have a 1991 5. So, I've come here hoping to find some answers. 7L 145,000mils. It is not uncommon for EGR valves to malfunction and become stuck in the open position. Expert. 6 milliseconds. The truck sat for 2 weeks without being started. 11. It then bogs and backfires 2 Answers. 7L 350 TBI with 109k miles on it. Idles fine until warm. Dec 21, 2017 · Missouri. Spitted out a lot of black soot out the back pipes at first, sprayed w-d on carborator work for a little bit then went Nov 8, 2009 · Recently bought a used 92 Sub with 5. TPS is throttle position sensor-probably 3 or 4 wire sensor at throttle linkage. Yes the pcv valve circuit you decribe is correct. 3L, 5. 3L V6 TBI. Apr 9, 2018 · 1999 GMC K2500 Suburban 7. Jun 2, 2012 · A truck can still misfire and not throw codes, so my advice would be to have them look at it, and then replace the plugs and wires, and then see if that fixes it. 1991 Chevy Silverado V8 Four Wheel Drive Automatic. When I tried to drive it, it would buck when going into gear and die when I was coming to a stop. 6 millisecond. Any possibilities on what could be wrong? Monday, June 6th, 2011 AT 5:07 PM. Let the idle smooth out first and she is good to go. I replaced the plugs, wires, cap, rotor, and air filter. down. I continued to try and accelerate, it moved, but it labored … Mar 26, 2021 · Buy Now!New Idle Air Control Valve from 1AAuto. Hi all, I cleaned the TB on my 4. I manually idle her up to about 1500 and after a small amount of time she will smooth out then idle like a rock at about 750ish. A 91 chevy c1500 4. Scotty Kilmer,EricTheCarGuy,Robert DIY,MrDidrill,ChrisFix,Bruce Pender,Rat MEMBER. 7 TBI This is a very easy fix to possibly remedy your idle problem. I proceeded to drive off giving it gas it bogs down meanwhile there was no check engine light on dash at anytime. #4 · Feb 28, 2008. After the install of the 350 it would idle eratic and usually stall at stop signs. 3L and it help high idle at all times, whether the engine was cold or hot. #1 · Sep 15, 2002. i am the original owner. 3l with a 5 speed - Newest project I picked up to fix up for my son (hopefully with some help from him on the bodywork. If there is a leak it will sound like a tire going flat (nail hole). When started cold the engine should start without pushing down on the gas pedal. a bad spark plug or spark plug wire or two will cause rough idle or dead missing. I replaced IAC, CTS, TPS, ETS, EGR valve, EGR solenoid, FPR, Injectors, fuel filter at normal idle fuel trim. 7 V8. Jul 14, 2020 · TW97C1500. 3 and ever since then the idle has been jacked up. 0 %. Replaced. With the engine running Back probe the red from the volt meter to B and the black lead to a ground. Feb 24, 2021 · 4958 posts · Joined 2017. Changed the alternator, distributor w/wires and sparkplugs. #1 · Feb 7, 2011. I have done a tune up including oil and filter, fuel filter, spark plugs, wires, cap and rotor. 5 volt at idle should go high above 3. vacuum leaks at idle create this some have had distributor failures Oct 9, 2010 · Re: 1990 chevy silverado 5. They had to reset my computer. Idle for a few seconds and die. I drove to work fine got in truck at quitting time cranked truck started no issues but was idling rough. As the idle is rough due to the dead cylinder at idle. Nov 5, 2008 · take 3 or 4 foot of fuel line and put one end to your ear and run the other end around the intake. The desired RPM is based on sensor inputs and the actual engine RPM. I've had this issue for a while now. The jolt / shake is small enough that it could go unnoticed if you weren Jan 7, 2016 · 2. Problem: excessive corrosion internally on the Engine Coolant Temperature Sens 1995 CHEVROLET TRUCK. Jul 11, 2011 · i have a 99 dually 4door 4x4 7. I have checked my timing, replaced the plugs and wires (AC Delco), as well as the Coolant temp sensor, PCV Valve 225 MILES. It has the 4. I have a 91 chev 4x4 truck that had a 305 engine in it. I pulled the plugs and the drivers side bank dont seem to be burning clean (passenger side are nice and Jan 2, 2004 · If it fails it can cause rough idle due to incorrect fueling from the ECM due to the sensor giving incorrect data. Carb cleaner actually removes some of the plating on the TB. would backfire and smelled rich. 5 at WOT. Jun 2, 2008 · I have a 1991 Chevy s12 4x4 with a 4. com http://1aau. 7L tbi 350 Will Not Idle/Stalls. Voila it ran beautifully! Today I replaced my O2 sensor and both CV axles. When you first start the truck whether it is hot or cold it idles up and down and will clear out instantly without notice. Won't maintain a consistant idle -- dies out and has a rough sound to it. when idle is rough at normal engine temp then could be a vacuum leak . Always start with the basics along with visual over sight before repairs. The idle air control valve for Chevy C1500 controls the air going into the engine. Engine Won’t Idle Smoothly, Idles Too Slowly, or Stalls. If it doesn't come down, it may be suspect. 7 parts air to one part fuel. with the wear. I just put new heads on my 5. I have a 1991 Chevy S10 with the 4. truck has 63k miles. 0L, and 5. Sometimes it clears out immediately or a few seconds later. I have a 97 Silverado 1500 5. It will start and idle with no problems, but when I try to accelerate it hesitates and starts to run Dec 25, 2018 · She smells very rich as well. The truck misses for about 30 seconds after start up when the outside temperature is below 50 degrees. post back your findings. Except, you didnt say whether the engine was hot or cold. Remove the IAC solenoid and test it for dead spots ,the plunger is most likely stuck on one position. It idles normal. 3 v6 that stalls out in gear and sounds like its idling low. 1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig). Sep 8, 2014 · 1992 S10 Blazer 4. Once engaged in gear (brake fully depressed), the idle hesitates and drops even before the truck is moving (forward or reverse). #9 · Sep 4, 2007 (Edited) Re: 95 Chevy S-10 4. I did a self scan of the emc and got code 32 from it so I replaced Aug 22, 2013 · 2926 Answers. The engine runs rough and has stalled a few times with all 1992 Chevy K1500 5. The EGR is important to the Vortec computer engine management. It also idles rough when the volts drop to 12. 1987-1995 Chevy Idle Air Valve replacement to fix Idle issues on the 5. 7 Flooding on Startup. It only happens when engine reaches full temp. On my way to work last night and my truck starts starts sputtering crusing at low rpm and little load on the throttle. Replaced: coolant temp sensor, tps, map sensor, fuel filter, and o2 sensor. 2 - 1. 1990 GMC C1500. 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. Powered By. When it gets above freezing the truck will run very rough. 2 posts · Joined 2011. I'm running out of my own ideas. I did not drive the truck again until Wednesday. That "set screw" thing under the cover is a factory set airflow screw to help the idle sit at roughly the 650RPM number. 92 4. These are attached to the bottom of the air cleaner. 1. After running for a while and the engine warms up it runs great. I was told that the MAP sensor puts out 1. 7 TBI stalling out when put into drive or reverse gear as well as stalling at idle and or sever hesit Aug 12, 2019 · It s/b 9 - 13 PSI (according to GM specs), at idle and under acceleration, preferably 11 - 13PSI. #1 · Jun 22, 2011. Before the install it idled fine. 5 RCLB. #1 · Nov 3, 2010. No vac leaks,timing … read more. 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. I had to take it to the local shop and they told me that this happens to alot of the 4. It is not advisable to "adjust the idle" on a TBI engine by an manual means unless it was previously messed with. Plug the vacuum lines with golf tees or other suitable item. 7L will not idle. Dec 4, 2012 · 1990 chevy c1500 hesitation and stumbling during acceleration. Jun 30, 2011 · 95 5. Vacuum Leak. 4 k3500 truck that idles rough. Currently: 2002 Yukon XL 2500 4x4 w/ 8. Rough Idle. ) I had a "service engine soon" light on so I limped to the auto parts store and the disgnostics said "O2 sensor". Dec 13, 2018 · Fuel Pressure Regulators can go bad. It idles at right about 900 rpm when warm in park, when it used to be 650 or so. If you start to experience engine misfires, stalling, or rough idling when the car is stopped, it can also be a warning sign of a bad TPS. TPS code 22 low voltage 3. started bucking, rpms rapidly going up and. 7 TBI. Jan 7, 2017 · 10 posts · Joined 2017. Gas pedal response is fine after it. I am not an expert, I’m a semi professional ama Feb 7, 2011 · Loc Discussion starter. There is a variety of strange things going on with this truck, so I thought I would give this forum a try. It stumbles as if it's missing a couple of cylinders when you accelerate. 3l DOD, 2014 GMC Terrain FWD 2. 0l, 2009 Chevrolet Tahoe 2wd 5. Step 1. probably a PCV valve/hose issue . Jan 12, 2016 · Bad Throttle Position Sensor Symptoms. 73 w/positraction. on my way home from work today it started a rough idle at a stop light. 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. 3L TBI 180,000 miles. Fuel – The ideal air-to-fuel ratio is 14. 171,000 miles Lost power, engine stayed on, but very rough idle, with minor backfire, and little acceleration. Another Update, It looks like internet and my repair book is wrong on the subject of MAP sensor voltage. One out of five times the idle will seem to fall out when taking it out of gear and coming to a stop. You may be loosing fuel preasure to the injectors if a leak is occuring. 3L TBI - Idle troubles. but it runs great when accelerating or about Post: 94 Chevy 1500 fluctuating idle (Topic#302344) Driverke Forum Newbie Posts: 1 1991 Chevy C1500 Silverado 5. I have a 1990 Chevy C1500 (5. I have a 97 4. Its not throwing any codes and all gauges are reading normal. When you first start it u need to give it throttle for a few seconds to keep er running and when she does stay running she idles really low, then if your not giving her gas and you cut the wheel shell cut out. Cold start idle is up and down for about a minute until Closed Loop kicks in and then it's fine. I think that's a code three. Stock fuel pressure should be around 9-13 PSI for GM TBI. 7/350tbi), I just bought it from a used car lot and noticed it was running rich (overwhelming gass smell from exhaust). wires, plugs, distributor cap/rotor, tps, ignition module, map, IAC, engine coolant. The code reader is flashing long, short, short. When truck is cold it idles smooth as soon as it warms up it will idle rough and stalls. /dies. Posted by Donald on Mar 10, 2012. 5 satisfied customers. 6 CYL. ) Mar 10, 2012 · 1990 1500 runs good when cold but when it warms up rough idle then stalls. You might call it flow thru filtered crankcase ventilation. The EGR valve is variable so it can change the amount of exhaust gas being pulled in. Jul 28, 2010 · When it idles in gear, my voltage is also lower. If the IAC is working properly, the idle will come down on it's own after several minutes of high idle. 21 % of the time it's the. Engine Performance problem. and found out that the person they got it from changed the exhaust. It feels like a misfire. 2007 Yukon. You may want to get the combo MAF cleaner and throttle body cleaner and check your throttle body for gunk too. Currently . Gas pedal response is fine after it warms up a little. here's a link to th Jul 23, 2019 · This is a 1990 Chevy K1500 with only 100k on the dash. My 1999 GMC K2500 Suburban has a very slight rough idle. I have a 1991 c1500 5. It ran ok, but was in need of a tune-up. FPE Tuned (dsp5) FPE Tranny (suncoast 3) FPE Turbo (68mm) FPE Turbobrake. 7LStarts/runs 2 to 10 sec. 3 v-6 and automatic. San Diego, CA. My 1991 Chevy Silverado starts up ok, but has a rough idle until it warms up. Cap Jun 29, 2020 · In this Video i clean the mass air flow sensor on a chevy blazer to fix the rough idle. Mike . 300,000 MILES. MAP code 34 low voltage. Apr 24, 2022 · This is a follow-up video to my question about the GM 5. Aug 19, 2020 · SOLVED: 1993 c1500 5. see if the misfire at idle goes away. Once warm idles a bit and decreases to 0 RPM. 2 - 4. It happened to me (among others) with a new Spectra Premium distributor within a couple 1000 miles. We have a 1993 Chevy C1500 with a 5. Mar 1, 2020 · 1994 CHEVY 1500 5. 1991 chevy 1500, 350 motor, 2wd. Jun 2, 2008 · This weekend I put a new idle air control valve and o2 sensor in, and the symptoms still persist. If i try to start it right away i … read more . A couple years ago, I rebuilt the engine and kept everything bone stock. Apr 18, 2019 · This is a video about rough acceleration rough idle low idle and possible stalling See full list on 700r4transmissionhq. When the temperature outside is colder then freezing the truck will run great. After installing the rebuilt engine, I started immediately having MEMBER. I've checked the MAP, TPS, & IAC. guys. 5 with lights and ac on. 7 TBI 700r4 Trans Email Report Other Symptoms: Poor engine performance when cold or as it reaches operating temperature, hard starting, poor acceleration, rich fuel mixture at idle and stalling. Hi cmorphis. common on these crankcase hose leaks from the intake manifold . 3 v6 TBI. If I try to take off before the idle smooths out she will sputter and die. It does fine to start and accelerate. Dec 24, 2009 · 1 answer. 04 Silverado Duramax. This data is wrong. 7 that is dumping fuel at idle. I must be missing something here, but I am about out of ideas. That buildup may also have plugged a small air hole in the throat. 5 at Wide open. This usually happens when driving slow in town backing out of parking space, letting off gas when coming to a stop sign or to park etc. PCV valve. The truck has a NV3500 so the whole truck would surge. This can lead to exhaust gas recirculation, which causes rough idling even when the conditions are not desirable. It was in the shop a while back and they helped seal up the vacuum, but said there a small leak through the throttle shaft. It will correct itself after about 5 seconds, can usually correct it a little quicker by revving. When the problem first began, it felt like just bad gas. temp sensor, rebuilt fuel pressure regulator. 1994 k1500 5. In park with the engine on, the truck idles completely fine, with or without the brake fully depressed. Apr 20, 2024 · I had was sounded like valve train clatter, somehow the valve train clatter stopped and it had just a low compression in the #3 cylinder. *Sold*. When I come to a stop it will idle fine for about 8 to 10 seconds after tack lowers to about 600 rpm's. IF I run the ac and headlights it drops to about 12 volts. 3L that was put into the s10's. This motor is the 5. It may be a fuel line leak if the smell is that strong. not sure if its the injectors or the timing or if i need a tps sensor. In park voltage is right at 14 volts. Air – The air entering your truck’s engine must be metered by the May 1, 2014 · 22- How to fix a rough running engine that stalls at lot of the time at stop signs. In order to Feb 17, 2020 · TBI 350 Intermittent rough idle/near stall taken out of gear SOLVED (kinda) 1991 K5 TBI 350 with SM465. What may be happening is an issue with the Chevrolet C1500 idle air control valve, so turn to AutoZone when you need a top-notch replacement part. A faulty fuel injector can cause your engine to get too much fuel, leading to a rich fuel Mar 25, 2014 · The idle in gear was about 1100 RPM. Very noticeable in second gear at about 25 mph. Feb 28, 2018 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Mar 26, 2014 · Diagnosing A Stuck Open EGR Valve (GM 4. you might also want to unplug the power brake booster hose and block it. Remove the wing nut on top of the air cleaner and lift the air cleaner off the throttle body to access the vacuum lines. I got it home same problems idles very rough hard to start and will barely stay idle more often than not dies when in idle especially when I put it in gear. Here is the thing that is so weird to me. to/ic/1AISC00031The idle air control valve keeps your engine idling properly, If the valve get Nov 3, 2010 · 14 posts · Joined 2010. Twist and pull the vacuum off of the bottom of the air cleaner and lay the air cleaner aside. . I have a 1991 Buick Park Avenue. It has a hard time with ANY load (even the A/C compressor). One of the most common symptoms of a problem with the vehicle’s EGR valve is a rough idle. The problem I'm having is that once I put my truck in drive or reverse it boggs the motor down and dies. The carbon build up keeps the throttle plate from fully closing against the stop. It threw a code 45 and I replaced the 02 sensor. 7 vortec 2wd 195,000 miles. The truck idles rough and is running really rich. It's been running good/bad for a few months. 7/4L60. Your S10’s engine needs air, fuel, and spark to achieve optimum ignition . I have checked for vacume leaks at the intake manifoul using either at the gaskets. Oct 4, 2002 · 4 posts · Joined 2002. Jul 11, 2011 · I have a 95 chevy 1500 4x4 5. 153,000 MILES. Jul 18, 2015 · MEMBER. When I take off from a stop light it runs rough, but once I get going it seems to run fine. 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 1989 CHEVROLET SILVERADO. fuel pressure should be good because if you have no cold start issues probably not a fuel system . had to put it in neutral and rev it a Dec 21, 2009 · 2004 GMC 2500 4x4 6. Went from low idling to the idle getting too low to keep the battery charged to the above mentioned issue. It will start right up and idle ok in park but as soon as I put it into drive it stalls out. 3 v6. 3L. 0L, 5. 7 4L60E 4x4. If it is a faulty throttle position sensor, you definitely don't want to wait to get this checked out. 3L V6, 209k miles, and a manual transmission. Runs rough in. 03 Sierra LQ4 Denali. Even coming to a stop you can feel the truck still pushing when slowing down because its idling at 1100 rpm when braking. So I have a 95 TBI 350 with about 190K miles on it. everything is original, plugs, wires, rotor, cap, pcv valve, fuel filter, etc. Which says open dump valve or faulty ECU. New to the forum, but I have been a frequent visitor ever since I picked up my 94 GMC Sierra. ($8 at Walmart) Beachbourbon. I replaced the sensor and all seemed fine. It will run normal on occasion but only lasts about 45 seconds or so. the injector pulse width might be 2. 4 Rough Idle. 2WD. The fix is to service the valve regularly and make sure that it is clean and fully operational. Any ideas? Nov 6, 2013 · 238 posts · Joined 2011. Asked by dragonflyoffshore Nov 27, 2012 at 11:42 AM about the 1995 GMC Sierra 1500 K1500 SL 4WD Extended Cab Stepside SB. Apr 7, 2018 · This has been known to throw codes, by the oil contaminating the MAF down stream. Ran better, but still stalled. I have a 1993 Chevrolet C1500 with a TBI 5. Apr 27, 2010 · 240 posts · Joined 2008. #1 · Jan 7, 2017. (I put in a new set of spark plugs 9 months ago as routine maintenance. Circuit Description. I have a 99 1500 with 5. This happened Friday. It runs good sometimes for 1 hour and then the engine at idle goes from 900 to 1500 and starts running rough and then dies. Jul 28, 2023 · The most common cause of a rough idle and gasoline smell is a faulty fuel system. 03 Sierra 2500HD. #1 · Jul 12, 2015. 20,000 MILES. Aug 25, 2011 · I'm driving this 2K 4Runner. Four circuits are used in order to control the IAC valve, allowing a precise amount of air into the intake manifold. 205 MILES. 7L tbi and timed it. leaking power brake boosters are an issue. So, a few days after purchasing it earlier this year it started a surge at idle. Will start right back up, because the battery somehow has enough cranking amps. I tried to let it just idle a bit thinking that it would fix itself, but after 3-4 minutes nothing had changed. egr valve with piece of carbon in it will cause hard or no start and or bad idle. 7L 4X4. I have a 91 Silverado K1500 4x4, 5. #1 · Nov 6, 2013. So, yes, no EGR will make a difference. Once the truck gets going it is completely unnoticeable. 5. 6 volts at idle and around 4. 2005 Chevrolet Silverado LT Duramax/Allison 4x4. I have replaced the plugs, wired (delco factory) cap, roter, Iac valve, idel selonid. 3 CPI Votec engine. When first started in cooler weather the engine misfires, runs rough. 3 to 2. 7L 350 TBI Surging/Sputtering/Missing. 7L TBI Dies at idle when warm. 7L. It seemed to be struggling with idle so I turned the connector for my IAC 180 degrees and tried again. Apr 10, 2013 · HI, You may have some carbon build up in the throat of the throttle body itself. AUTOMATIC. It isn't usual for your truck to run rough or have issues with backfiring. 2L V8 runs very rough and stalls. Anyways, the truck had always ran very well, started up right away, and it has a good smooth/strong running motor. This started as a surging while driving at constant rpms. #5 · Feb 24, 2021. When I ran a scan, the P0102, Mass Air Flow Sensor code was returned. 7 tbi with 115,000 miles on it. i spend zero on parts i pull them from donor engines trucks. 4l DOHC VVT- Acquired the hard way, 1991 S10 4x4 Extended Cab 4. Jan 14, 2011 · Use throttle body cleaner as well not carb cleaner. 1991 CHEVROLET SILVERADO. Mar 14, 2021 · This is a tutorial on how to swap out an IAC valve in your 1991 Chevy C1500 pickup. Don't drive it until it's plenty warm. Jun 3, 2015 · 1994 GMC Sierra - Very Rough Idle and Sluggish Response. Help, I have a 1992 S10 Blazer with the 4. 1991 CHEVROLET ASTRO. A bad fuel pump can cause your engine to not get enough fuel, leading to a rough idle. Aug 30, 2019 · What an Engine Needs to Idle Smoothly. Runs very rich at idle and smooths out at 1,100 rpm. In gear it drops to about 13 volts. If I put in drive and try to keep it running the rpms will just go up and down hard then stall out. 97 Sierra 1500. Mar 17, 2004 · I had the same problem. Ive got a 91 silverado 350 with some idle problems. Hey guys. 3 to 1. 7 with 191K. Smells like un-burnt fuel too (emissions) Nov 24, 2013 · The truck idle drops and lopes and occasionally completely stalls. 2. It's my first GMC ever . kc to zp ph je tm xe zm kt bv