Oil Peessure dropping very low when sitting at stop light.
35

Asked by Jim Mar 27, 2017 at 08:29 PM about the 1989 Chevrolet Corvette Coupe RWD

Question type: Maintenance & Repair

When I stop in my 89 at a stop light.  The temp immediately jumps to above 210
to 225.  When this happens my oil pressure drops to 4-6 on gauge. Cold it is at
50+, I have replace oil pump with a melling high volume/high pressure pump
and no change.  I even tried a 165 thermostat, no joy. Any ideas?

5 Answers
34,745

lrodri911 answered 7 years ago

Your problem is not the pump. The engine has internal wear, either rod or main bearings have large clearances and it gets worse as the oil heats up, because oil looses viscosity when hot. Replacing the thermostat with a colder setting will help a little but once you ramp speed up, oil pressure drop pressure again. How many miles on it?

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F_O_R answered 7 years ago

You may have a worn engine but I would first have the oil pressure checked with a mechanical gauge so that you know for sure what is going on. The problem might just be a bad oil pressure sending unit.

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Mithalex answered 5 years ago

Hi i I own a 1987 corvette 76800 mil I turn the key engine rotate battery new but some times do not start to start I have before put my key run the fuel pump manually thru the pump relay for 2 seconds then the car run normally some people tell me is the oil pressure switch that control the system. If this fail can you give some idea? Waht to do? Thanks Alex metzler

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