04 trailblazer check gage light oil pressure

Asked by Moms9BayBays Oct 29, 2018 at 11:44 AM about the 2004 Chevrolet Trailblazer LS 4WD

Question type: Maintenance & Repair

I have 2 questions if anyone can help
me out!! While driving, idling, or in
park my check gage light comes on
and my oil gage drops to 0 light will
go off an it goes to normal. It still
runs normal and there isn't no
knocking.. #2 I can have the heater on  
floor or vents an not have no problem
but if i turn it on to defrosters my
truck will stall . If I need my
defrosters i have to keep my foot on
the gas. It's really the weirdest thing

2 Answers
11,575

FJ4072 answered 6 years ago

Hello! Make sure you have oil in your engine. If so, your oil pressure switch may be bad, or less likely, your oil pump. The pressure switch is located right by the oil filter on the I6 engine. If it has oil on it, it's bad. The 2nd problem is an easy $5 fix. Remove fuses # 10 and #28 under the hood. Completely remove the throttle body (4 bolts and an electrical connector). Use a rag and a nylon brush and clean with a sensor safe spray like Seafoam. When done, install the throttle body, then put the fuses back in. Will take 15 minutes or so of driving for the PCM to relearn the clean throttle body. Very common problem on our platform.

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