Oil pressure on my gauge is dropping right after I start the engine

DODGE71

MEMBER
2002 CHEVROLET TRAILBLAZER
146,000 MILES

I have a 2002 chevrolet trail blazer that looses oil pressure 10 seconds after you start it, but if you shut it off and start it back up it does the same thing.I have changed the oil pressure switch and still does the same thing. Does anyone have any ideas on how to fix it?

6 Replies

FACTORYJACK

MECHANIC
4,159 POSTS

Physically test the oil pressure, with a gauge at the sensor port. It could have a sticking regulator valve in the oil pump, or internal engine fault that is resulting in loss.

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Tuesday, December 27th, 2011 AT 6:13 PM

DODGE71

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8 POSTS

How do I fix a sticking regulator valve?

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Tuesday, December 27th, 2011 AT 6:18 PM

FACTORYJACK

MECHANIC
4,159 POSTS

If that is what is failed, it is part of the oil pump assembly, which on your vehicle, is in the front engine(timing) cover.

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Tuesday, December 27th, 2011 AT 6:28 PM

DODGE71

MEMBER
8 POSTS

Dear factory jack, thak you for your help. I checked the oil pressure with a manual gauge and it was doing the same thing. What I triaed, before changing the oil pump was draining about 2 quarts of oil out and adding kerosene and started it up and ran it for a while. When I pulled the drain plug out there was a bunch of gunk in it. I changed the oil and filter and I am now carrying about 60 psi and it fluxuated for a minute and has been fine since then. Again thank you.

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Wednesday, December 28th, 2011 AT 2:16 AM

FACTORYJACK