Question about Chevrolet Blazer
If it is the IAC valve, or even if it's not because the vehicle is more than 14 yrs old, remove IAC and clean with MAF sensor cleaner...remove all carbon, spray liberally on spring and pintle and inside pintle access, do not touch with bare hands, wear rubber gloves and wipe pintle in a straight forward movement. Do not turn pintle, if you do by accident, it will readjust on it's own, but will take a while longer...cheers..
Note: when done and reinstalled, let engine run and Idle for about 15 minutes to readjust properly...
Posted on Jan 21, 2018
Is this only occurring at Idle? In other words, if at speed, you turn on fan ac controls and it runs fine (until you return to idle such as at a stop light)?
If so, then I would suspect the IAC (Idle Air Control) valve. When you turn on the fan control and the compressor kicks in, the IAC circuit is supposed to maintain the engine idle.
I recommend checking the IAC valve first, then let us know your findings.
Posted on Jan 21, 2018
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Posted on Jan 02, 2017
SOURCE: low idle stalls out
Here is the most common cause of surges and stalls at stops and low erratic idle speed and 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.
Posted on Mar 13, 2009
Chevrolet 2004 TrailBlazer
Look next to the blower. You can remove the panel under the passenger side. Go through the glove box and move it down out of the way to access the electrical connector. Then remove two bolts and the electrical connector.
Posted on Apr 21, 2009
if this happens while the defrost of ac is turned on, it could be a seized ac compressor which will cause the serpentine belt to squeal and drag making the engine sometimes stall. if it happens with the ac off and the selector on say the floor, or dash vents, the issue could be a bad alternator and battery. this is confirmed when the blower motor engages and the lights dim and then the truck goes dead.
Posted on Feb 17, 2010
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