Question about 1996 Chevrolet Blazer

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I have a 96 Chevy Blazer 4x4, when driving last night, I noticed the oil pressure gauge drop to zero. After a few moments, it rose back up to where it is normally (around 70, if I remember correctly). As I continued home (not a great distance, 1-2miles at most), it dropped and corrected a couple of more times. What could be causing the fluctuation?

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Hello,

Many things can be causing this issue, the worst is an engine problem, but before thinking the worst lets point out some of the not so nasty things.

The sensor could be bad, or the gauge in your Blazer could be going, if you have those vac tube digital gauges be known they do have issues, if you have the normal "arm sweep" gauge they are temperamental as well.

Another often overlooked problem is a clogged or very dirty oil filter causing sudden spikes and or drops.

Some electrical gremlin can be messing with the readout, sudden loss of a ground or feedback over the wires could cause problems.

The sensor for your Blazer is under $50 at Advance Auto Part No. 12553175 , it would be worth it to replace and then see if you still have the problem.

Below is typical oil sensor replacement, tho it's not your Blazer this should give you an idea on what to do.

Hope this helps.

Posted on Dec 31, 2010

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Hello,sounds like oil pump going out,get it checked at shop quick or you may lock up your engine.check oil level,also plastic hose for oil pressure sending unit,usually near distributor

Posted on Dec 31, 2010

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