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Unread 09-30-2002   #1 (permalink)
electrobe is offline Rookie


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Question oil pressure drops after warm up

I just bought a 94gt and when I first start it up, the oil pressure is about 3/4 of the scale. After driving for about 30 mins the gauge shows about 1/4 of the scale. Is this normal? The car is bone stock and runs good.
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Unread 09-30-2002   #2 (permalink)
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that is very, very common, my oil preasure while cold at idle is around 56 PSI and drops to 20ish PSI when warm
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Unread 09-30-2002   #3 (permalink)
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I am not sure about the factory gauge dropping that much, but since you just bought the car. I'd check the oil first and look at it condition( color, viscosity, gassy smel, etc..) then probably change it and do a complete tune up
Oil pressure in the low 20s(when warm) is usually from loose clearences on the crank, alot of fuel in the oil will also cause low oil pressure as well as some oils. I find synthetic oils to hold the pressure higher over a longer period of time.
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Unread 09-30-2002   #4 (permalink)
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I had this exact same problem , and recently too. It turned out my oil pump took a sh*t and left me with some locked up lifters and a messed up push rod. It would be around 38 psi cold then to around 5-15 warm. Finally i could hear the lifters clicking really loud and i paid the price for delaying.

I thought my gauge was bad (i have an external sun pro gauge), but it seemed to work ok when cold so there wasnt any air in it.
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Unread 09-30-2002   #5 (permalink)
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Quote:
Originally posted by stangmanK
I
Oil pressure in the low 20s(when warm) is usually from loose clearences on the crank, alot of fuel in the oil will also cause low oil pressure as well as some oils
Per Smokey Yunick, a NASCAR legend and a developer of the Chevy small block....oil preasure should be 15 PSI plus 10 PSI per 1000 RPM, my idle is 500 RPM.....
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