Question about 2002 Chevrolet Trailblazer Ext

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Oil pressure reads 40 lbs on inside dash until it worms up then drops to 15 or 20. pressure gauge already replaced. help 2004 trailblazer.

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  • yadayada
    yadayada May 11, 2010

    15-20 is normal oil pressure on a hot engine, they run it low to save on fuel. don't worry about it it won't hurt a thing.

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If car has a lot of miles you might be dealing with worn main bearings in the engine.

Posted on Apr 30, 2010

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I have a2005 chevy trailblazer 5.3...no oil pressure at a idle...50 lbs when I step on the gas.changed the oil pump same thing


Have you checked the pressure with a mechanical gauge to make sure the gauge on the dash is correct ?
And did you check the rod and main bearings for excessive wear when you replaced the pump ?

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I have been having intermittent problems with my '04 Trailblazer oil pressure gauge. Recently, when I am stopped at a light, or sitting idle, the oil pressure gauge drops to zero. Then, when I get...


It sounds like the oil pressure switch has failed. It is only an on/off switch that trips at about 15 - 17 PSI, the reading displayed on the dash is created by the computer based on the pressure switch being closed and the engine RPM.

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The oil pressure lite came on oil is full slow revs cause drop in pressure


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2000 Grand Cherokee V8: Cold start Oil Pressure is good at 600 rpm. Gauge drops to 0 in 2/10 mile as rpm increases to 2000. Warning light and bell comes on. Gauge varies between 0 and 40 depending on...


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Oil pressure gauge reads 40 or half pressure


on general motors engines all the way down to 15lbs of oil pressure is acceptable i prefer 30 but if the 40 you have down is the lbs of pressure your in good shape brand new engines generally only have about 45lbs of pressure

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Oil gauge drops to 0 after driving about 30 min. However it still runs fine with no noise. I had the sensor changed and it still does the same thing.


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1 Answer

Oil gauge goes up and down.


If grounding the dash does not work, try putting a mechanical gauge on it and reading actual oil pressure. Pressure does change while driving, but should not wander. With mechanical gauge, check that running hot at idle (in gear if automatic) pressure should not drop lower than 15psi (I'd rather see 20) High reading should be around 40 -50 but no higher.Low pressure indicates a loss of supply or bad bearing on the crankshaft, high pressure may be caused by sticking pressure relief or restriction in an oil passage.

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