Question about 1999 Chevrolet Silverado 1500

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1999 Chevrolet Silverado with the 5.3 long crank time and low idle on cold starts. Runs fine all other times. Idle air control is worg and compensating for things like the a/c and throttle decels.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

landsend
  • 1066 Answers

SOURCE: high idle will not lower

sounds like you have something blocking the linkage or the throttle body isn't closing totally or you have a air leak.

Posted on Apr 01, 2009

emissionwiz
  • 75197 Answers

SOURCE: IDLE PROBLEM

Here are some of the causes of surges, 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 and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Posted on Apr 14, 2009

  • 6 Answers

SOURCE: idle speed control throttle position lower limit

souds like you need a new throttle valve and once youve got tyat you need to carry out basic settings on the valve to adapt the valve to ecu good luck gtiR out.

Posted on Jul 19, 2009

  • 38 Answers

SOURCE: 1989 Chevrolet C1500 with 5.7L V-8. Engine dies

fuel pump is working but when accelerating it doesnt pump enough fuel up to the engine then it will fall on its face if it is a electric pump you may have to drop the tank if it is inside and replace it if it is on the engine replace it thats what is exactly wrong with it

Posted on Jul 31, 2009

alicantecoli
  • 22095 Answers

SOURCE: vw polo 1.0 1999, Rough idle, we have cleaned the

right hand side of the intake housing where the butterfly is ----a black plastic box held on with 4 star headed screws ,the carbon tracks inside are pitted and burnt

Posted on Nov 20, 2009

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1 Answer

1993 1500 truck 5.0 high HC at idle


It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

Ford Expedition IAC valve replacing

http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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Stumbling and stalling at idle after engine rebuild?

http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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1999 Ford F-150 Idles rough and quits when gas pedal is pressed less?

http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

------------------

Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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Cold start problem and vehicle shudder around 2500 to 3500 rpms

http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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GMC Sonoma Stalls and idles low

http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

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GMC Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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1996 Camry intermittent engine failure while idle?

http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html

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Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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High Idle Problem

http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

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High rpm in neutral? Inconsistant high RPM in neutral?

http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

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Vehicle stumbling at idle and shows code 54?

http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html

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Rough idle, staling and Erratic shifting?

http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

-----------

While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

---------

These details will help.

Thanks.

Dec 06, 2012 | 1999 Chevrolet Silverado 1500

1 Answer

High idle 99 k 1500 z-71 4.8l manual transmission


This truck uses an idle air control valve to change the idle speed.
The valve could be dirty or failing.

Jul 03, 2012 | 1999 Chevrolet Silverado 1500

1 Answer

Hi I have a 1999 Chevy Silverado 1500 with the 5.3 motor in it. And Im having starting problems. In the mornings when the motors cold it starts just fine. Then when I drive it somewhere and park it then go...


It may have knocked some crud loose that could be blocking the line somewhat.
I would take the line loose in different sections and take some compressed air to the line and blow it out to make sure there is no junk in line.

Nov 14, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

Truck starts low idle about 500rpm, sputters then


have some one check the mass air flow sensor or idle air control

Mar 02, 2010 | 1999 Chevrolet K1500

1 Answer

I have a 2000 chevy silverado, i am looking for curb idle and tune up specs , it seems that the idle is low when parked, 500+ -- and when done running around it may be as high as 950 rpm, when i turn it oo...


T here are no adjustments they are computer controlled, you can not adjust them, what you need to do is check the idle air control valve it sounds like its bad and not working this is common, when start the truck it should idle up and slowly drop to idle replace that valve.heres a picture of it.its located on intake on throtlebody. hope this helps.also idle spec is 650rpm at idle.f3cecb3.jpg

Feb 11, 2010 | 2000 Chevrolet Silverado 1500

1 Answer

Ruff idle on cold start. Idle goes up and down for about five minutes. 99 chevy silverado with the 5.3


bad MAP sensor or throttle body base gasket is leaking also the idle air valve ports can be clogged and the idle air solenoid is weak or bad

Jan 21, 2010 | 1999 Chevrolet Silverado 1500

3 Answers

Rough idle stalls at low rpm's


check your transmission fluid,the motor will stall when fluid is low

Dec 06, 2008 | 1996 Jeep Grand Cherokee

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