Question about Cars & Trucks
I have a 2000 Chevy 5.3 liter V8 Silverado, on really cold mornings I go out and start my truck and it will start just fine, then it will rev up to really high rpms, sometimes up to 3,000 for a few seconds, then it will drop down to about 500 rpms, then cuts out and dies. If I hold my foot on the pedal for a little bit it will warm up and runs just fine. And when it's warm outside it doesn't do this at all, what is the problem?
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Posted on Jan 02, 2017
SOURCE: not reving high on cold start
Here is the most common cause of surges and stalls and low 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
Posted on Feb 06, 2009
probably is a emissions sensor problem, lots of these parts are plastic. check out the throttle cables, lub em wd40. there is a type of valve somewhere on top of engine, it may be cracked, pcv valve stuck. lots of possibilities, almost too much for solution online. something emmissions with an electronic sensor is acting up.
Posted on Feb 25, 2009
if it runs high when you first start it then mellows out,, theirs no problem , all of our chevys do that.... but if its sputtering or you hear a quiet popping noise check spark plugs
Posted on May 20, 2009
When I had this same problem...it was the Catalytic Converter...cost about 200 to get it fixed at the Hyundai Dearlership :)
Posted on Apr 01, 2010
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