Question about 1989 Toyota Tercel Liftback

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My oil light is coming on at idle (it never did before), and the engine is getting hotter than usual, about 7/8 up the dial after 5 mi on freeway on a hot day (previously it would run up about 5/8 on the dial). I’ve got plenty of oil & the coolant and radiator are fine. Oil pump? How is oil pump diagnosed?

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Best way is to have a mechanic hook a oil pressure tester to the motor and see if the readings are within specs.

Posted on Aug 26, 2010

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Yes, I think you are thinking right, it can be that the oil pump pressure is down.
If the oil was changed recently with the oil filter then there is no question of a possible clogging of the oil from the sump.
But you can check the oil pressure switch point for the ildling pressure with an external oil pressure guage. If this is low then the engine has to be taken out to confirm the drop in the pumping.
It must be done without the car being used at all as you might end up damaging the crankshaft and bearings with poor oil pressure.
Hope this advice helps you to decide.

Posted on Aug 26, 2010


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