Question about 2002 Chevrolet TrailBlazer

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My nieces car [2002 Trailblazer]: Friend fixed lights, beginning immediately periodically thereafter rpm's fluctuate widly prior to stalling. Sister-in-law took vehicle to Pep-Boys, they changed Camshaft Position Sensor. Problem remains. Sis-in-law asked me if I could help prior to spending another load of money. Any suggestions?

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Is she getting any check engine codes?

If not, perhaps during a repair attempt someone knocked a vacuum line loose or even just pinched a hole in one.

Her engines idle air control probably can't deal with the vacuum leak which would explain the irratic idle and final stalling.

A vacuum test would confirm or rule this possiblity out. So would spraying a little WD-40 or even a little water on the vacuum lines and check to see if the idle smooths out. You just have to go slow so you can be sure where the idle picks up versus where your spraying.

A mechanic with an OBD 2 scanner could pllug in and watch what all the sensors are doing in real time to see whats changing and how the engine is trying to compensate.

Good luck and be careful,

Posted on Dec 12, 2009

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