Chevy TrailBlazer Revs Then Stalls
yellowcloud
Member Posts: 1
in Chevrolet
I have a 2003 Chevy TB 4WD with 155,560 miles that has given me very little trouble. I replaced the alternator 4 days ago and yesterday after I got off the interstate, it began surging. I had a diagnostic done on it this morning saying that the MAP (module air pressure) sensor was bad. I bought and replaced it, but the problem remained. I had the code cleared and drove it approximately 50 miles hoping that the pc would cycle and correct the issue. This did not happen and the RPM's continue to rev and drop, even to the point of it shutting off at red lights, stop signs and during low speed braking. When driving on the interstate today, I engaged the cruise control. It maintained a steady 2100 RPM, but i could feel a control module closing and opening. I need to know if this sounds more like the TPS (throttle position sensor), the MAF (mass airflow sensor), or something else, like an Oxygen sensor?
0
Comments
rpm and trying to stall and then of course stalls. I cleaned the throttle body and now it wants to idle high about 2000 rpm till it warms up and then 1000 rpm and come down slowly to about 600 rpm and idle steady. Every time I stop its 1000 rpm them slowly down to 600 rpm.
After that I would look at the IAC valve, many times an erratic idle is caused by a gummed up sticking one.
PLEASE HELP
Hope it helps you too!
Step by step instructions and pictures to help.