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Joined Apr 15, 2007. 226 Posts. #4 · Feb 28, 2008. Re: extream high idle problem on 1990 chevy 1500, 4.3 v6 TBI. Good afternoon. Yes the pcv valve circuit you decribe is correct.You might call it flow thru filtered crankcase ventilation.TPS is throttle position sensor-probably 3 or 4 wire sensor at throttle linkage.

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Classic Chevrolet / GMC Pickup Trucks. 1988-1999 Chevrolet & GMC C/K GMT400 Platform. Stalls When Warm? Sign up for FREE! Become a GM-Trucks.com Member Today! In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs.

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I would start by checking the fuel pressure regulator and injectors, since pinching the return line helped that tells you that you need more pressure at the injectors, check for a torn diaphragm or broken spring in the regulator X2 along with the Idle air control valve!!! nitrosport_5 Registered Joined Aug 24, 2010 10 Posts.

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1991 Chevrolet Blazer engine problems with 4 complaints from Blazer owners. The worst complaints are broken crank, runs roughly after warmed up, and stalls, irregular idle speed when cold.

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1991 Chevrolet Silverado K1500 5.7L 350. High idle due to new idle air control valve not fully extending after - Answered by a verified Chevy Mechanic ... This problem occurred several months prior but went away after not driving the car for ... 1991 Chevrolet Silverado C1500 Extended Cab w/5.7 liter (350) engine, automatic w/AC, 98K miles.

Step 3 - Common problems with the 4L60E. These issues commonly can cause your transmission to slip. See if they apply to you and see what the solution is. Slow, slipping, or no reverse: You have a broken sunshell, or circuit issue in the valve body. A broken sunshell requires the transmission to be taken apart.

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The way to test this out is to start your Silverado and let it run at idle. Disconnect the EGR valve's vacuum line and apply direct vacuum using a hand vacuum pump. When you apply vacuum, the EGR valve should open. When the valve opens; if the passages are clean and unobstructed you should notice a large RPM decrease.

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Apr 02, 2010 · hoping to reach asemaster35yrs on same prolem with 91 1500 silverado 4x4. i still have same problem i dicconnected and plugged brake booster hose and still same problem i also removed the idle air control and cleaned the cavity in the throttle body and the idle climed to 1200 rpm but it seems to run better except for the high idle..

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My dakota was surging up and down at idle. I cleaned it and the problem went away. 29-41, 42-48, 49-54 Moderator 1948 Chevy Fleetmaster Coupe Purchased 6/2010. Stock with rebuilt 52 216 installed May 1966. ... 1991 Chevy C1500 Silverado 5.7 TBI 700r4 Trans Email Report CowboyTrukr "11th Year" Silver Supporting Member Posts: 4793 Loc: Salt Lake.

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My dakota was surging up and down at idle. I cleaned it and the problem went away. 29-41, 42-48, 49-54 Moderator 1948 Chevy Fleetmaster Coupe Purchased 6/2010. Stock with rebuilt 52 216 installed May 1966. ... 1991 Chevy C1500 Silverado 5.7 TBI 700r4 Trans Email Report CowboyTrukr "11th Year" Silver Supporting Member Posts: 4793 Loc: Salt Lake.

Oct 10, 2010 · Classic Chevrolet / GMC Pickup Trucks. 1988-1999 Chevrolet & GMC C/K GMT400 Platform. Stalls When Warm? Sign up for FREE! Become a GM-Trucks.com Member Today! In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs..

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Jun 22, 2015 · Step 3 – Check the driveshaft. It could be loose, or out of balance. Out of the three most common causes for vibrations, this is by far the most costly or complicated one. There have been numerous reports on Chevy forums about owners experiencing loose driveshaft joints, or out of balance driveshafts that lead to big vibrations at the wheel..

I purchased a 2001 8.1 2500HD Silverado (used from dealer) about a year ago it ran great until recently. I am now experiencing stalling problems when warmed up approx. between 140*f to 160f*, when it stalls its not constant, its happens when highway driving or standing in line (low or fast idle)when it does stall radio and other electrical items still work, idiot battery light flickers slowly.

Step 1 - Check your u-joints. Loose u-joints cause a terrible clunk when you put your truck in reverse or drive, and are actually dangerous. The u-joint is a component in the middle of your truck's drive shaft that allows the drive shaft to flex or rotate, which is based on rough pavement or suspension movement.

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Start the engine and let it idle. 2. Now, listen to the sound coming out of the tailpipe. If you hear a clear popping sound, most likely you have a performance problem; if not, check the engine mounts. A worn-out, loose or damaged engine mount can cause the engine to vibrate. A fouled spark plug can cause a rough idle.

1991 Chevrolet Blazer engine problems with 4 complaints from Blazer owners. The worst complaints are broken crank, runs roughly after warmed up, and stalls, irregular idle speed when cold.

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Sep 14, 2008 · Sep 14, 2008. #1. Recently rebuilt the 454 in my 1990 TBI Burb. I am having a terrible time with getting it to idle smooth. The engine has a little over 500 miles on it. I have spent countless hours going over the engine looking for vacuum leaks and believe every thing is OK on that front. I have replaced the engine temp sensor, the connections ....

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Failure Date: 05/01/2021. Vehicle starts to shake when driven above 70mph. If brakes are applied to reduce speeds from 75-70 the shaking significantly increases, but decreases to the normal shaking once the brakes are released. See all problems of the 2014 Chevrolet Silverado 1500 🔎.

1991 CHEVY S10 4.3 ENGINE WANT IDLE OR STAY RUNNING WHAT CAN I TRY ?SEEMED LIKE I WAS OUT OF GAS PUT ... We have the same problem mines 94. we have a spider injecter that went bad..300 part cheap at junk yard. we changed fuel filter,fuel pump,spark plugs / wires we were getting fuel all the way ... 1990 chevy silverado 1500 wont run.

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C/K 1500 2500 Silverado 350 / 5.7L. I put a quarter of a million, near trouble free, miles (water pump, alternator & 4 batteries) on the truck when, after leaving it set for about 3 months, it.

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The truck when at normal running temperature and at idle will idle fine for about 5 to 10 seconds then all of a sudden the idle speed drops to a point that I think it may stall then it revs up and surges then settles out and idles fine for about 10 seconds then this drop and surge repeats about every 10 seconds..

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Step 3 - Common problems with the 4L60E. These issues commonly can cause your transmission to slip. See if they apply to you and see what the solution is. Slow, slipping, or no reverse: You have a broken sunshell, or circuit issue in the valve body. A broken sunshell requires the transmission to be taken apart.

Sep 04, 2012 · Runing rich on idle can have several causes, for example: - Throttle Position Sensor failed or misadjusted. - Idle Air Controller (IAC) - Coolant Temp Sensor. - Fuel Pressure Regulator. - Obstruction in the fuel return lines to tank. - Pressure build up in tank due to failed venting system..

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Philly area. A TPS is a low-buck part. You've done enough diagnosis to try a new one. I don't think it will help, but it might. The TPS is one of the main sensor inputs on a TBI (speed/density) type system. When you unplug it, the ECM goes into "limp home" mode with a pre-set series of tables designed to have the best shot at keeping the engine.

Chevy silverado v4 mode vibration fix 2005 gmc yukon ... 2019 · If your car sputters when you step on the gas, it’s crying for help. 7 parts air 2011 Chevy Traverse problems. Chevy Traverse - (Car ... inAnother common cause of shaking when accelerating is worn or warped brake pads. 2014 Chevrolet Traverse V6-3. 1991 Chevrolet.

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The IAC (Idle Control Valve) is electronically adjusted by the on board computer. There is no way to manually adjust it. If you are having issues with the idle, the best remedy is to replace it.

Jan 29, 2017 · The only part of the ignition system I haven't tried replacing or inspecting is the control module. I've had to replace the ignition module that sits at the base of the distributor a few times, but the failure mode was always that it would start and run, but wouldn't apply any advance, run a little rough, and would throw a trouble light..

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98 Chevy Silverado 1500 oil gauge misreading. I have a 1991 chevy c 1500 with a 305 engine it will start and idle great when cold as it warms up it will stall if i disconnect the water sensor it goes back to high idle like its cold i changed the sensor but it still does the same thing what else can i try. you should hoof your truck up to a.

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1991 Chevy C1500 intermittent problem. Failed smog. 169,000 miles, 350 w/air, Auto. Intermittent rough idle/stall combined with what feels like vacuum assist on brakes going out. Failed smog (low 240 ppm and high speed 1830 ppm hydrocarbons). Replaced plugs,wires,rotor, dist cap and oil change. NO CHANGE. Tried to get computer trouble codes but.

Nov 24, 2013 · The truck idle drops and lopes and occasionally completely stalls. 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. It does fine to start and accelerate. I have done a tune up including oil and filter, fuel filter, spark plugs, wires, cap and rotor..

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Chevrolet Silverado 1500 Stalling or Low Engine Idle Speed Due to Dirty Throttle Body - 23 reports. Learn about this problem, why it occurs, and how to fix it. ... idle problems replaced master flow valve still have same idle problem ,almost cuts off at times and surges when rpm goes up . Report. 2000 Chevrolet Silverado 1500 49,500 mi, Visitor.

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1993 Chevrolet C1500. Asked by maniac121 in Panama City, FL on November 05, 2009. Truck runs great when driving down the road and idles smooth for a couple minutes after coming to a stop. Then it develops a "stumble" that is very pronounced. I'm fairly confident it isn't ignition as the distributor, cap, plugs, wires, and coil are new.

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1. Look for a high engine idle. A common symptom of a faulty idle control valve can be a high idle. Start the engine and look at the tachometer on the dashboard. Most vehicle's engines will idle at our below one thousand RPMs. If you are familiar with your engine's normal idle, compare that to its current RPMs.

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1. Look for a high engine idle. A common symptom of a faulty idle control valve can be a high idle. Start the engine and look at the tachometer on the dashboard. Most vehicle's engines will idle at our below one thousand RPMs. If you are familiar with your engine's normal idle, compare that to its current RPMs.

1991 silverado 3500: die..the engine is warmed..untill..idle fine Have a funny problem with a 1991 Siverado 350 5 speed trans. The engine when cold starts wonderfully, ides for about 5 seconds and wants to die.

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1991 CHEVROLET SILVERADO 5.7L V8 Ive got a 91 silverado 350 with some idle problems. 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. Any ideas?.
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