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My chevy 5.3 idles low sometimes stalls at stops

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  • Chevrolet Master
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Clean the throttle valve and the air bypass idle speed control valve, they get full of sludge and restrict air flow, this causes a low idle at times and the engine will stall, clean them by spraying carb spray into the throttle valve while the eng is running, have someone hold the idle high or it will stall, after using at least 1/2 can shut down and disconnect the battery for 5 minutes, this clears the memory and allows the computer to relearn idle strategy, the computer willl take a few days to relearn the idle, maybe 30 miles of mixed driving.

Posted on Oct 14, 2008

5 Suggested Answers

teezay731
  • 1 Answer

SOURCE: rough idle stalls at low rpm's

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

Posted on Mar 24, 2009

  • 178 Answers

SOURCE: rough idle stalls at low rpm's

hello first check your idle with the car running foot on brake see were your rpm reading is if your below 500rpm check your label underhood for your curb idle setting second see if theres a adjustment screw you can increase were your gas cable lever rest against your set screw underhood if you feel confident enough remove your iac motor idle air control valve if the bore were the end of the pintle extracts out to close has varnish builup our carbon it will stick creating vacuum leak type senario causing stalling rough idle sometimes even no start conditions good luck

Posted on Sep 18, 2008

csmock132
  • 4669 Answers

SOURCE: Idle Problem when you slow down of come to a stop idle goes low

Try cleaning the throttle body also check for vac leaks at the intake gaskets.

Posted on Feb 28, 2009

michigan man
  • 3533 Answers

SOURCE: 02 escalade, vehical stalls at low idle

if it has over 40,000 miles on it change the drive belt and have the alternator tested and also make sure all of the vaccum lines are on and in place

Posted on Mar 06, 2009

  • 1 Answer

SOURCE: 1994 toyota corolla has a runs rough at idle and

I am having the same issue, changed the gasket, rotor, and distributor cap. Spark plugs look fine.

Posted on Mar 29, 2010

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TRY THIS BEFORE U SPEND ANYMORE MONEY N PARTS.
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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.

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1 Answer

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TRY THIS AND LET ME KNOW IF IT CORRECTS YOUR PROBLEM
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Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk 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.

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