What is the factory idle speed for 2004 z71 with 5.3 engine?
I bought my 2004 Chevy z71 new with the 5.3 liter engine. The idle was always
good at stop lights until about 6 months ago. It now barely idles at 500 rpm at
stop lights and has actually quit running once in a parking lot. There has never
been a check engine light nor is there any problem with acceleration or highway
speed and passing... the problem only exists at idle.
I've had the throttle body (the fly-by-wire’ system) cleaned professionally by
machine to no avail. I took it to a Chevy dealer and they said everything was
fine even though the tach often shows rpm between 300-500. Prior to this
taking place, I always thought the rpm was around 600 but Chevy dealer says
not so, it should be 500 rpm.
My question is what's causing the slow/low idle at stop lights?
