Mechanics

OIL PUMP??

1990 Toyota Cressida

1990 Toyota Cressida 6 cyl Two Wheel Drive Automatic

So recently this car has had a fuel pump change and that seemed to fix the majority of problems. Now when I am idling the oil light comes on, as soon as I accelerate it goes away. I know there are oil leaks however the dip stick has been giving the same reading for over a month (about 1/2 inch above full). What could this mean and how much to fix? Does it need to be fixed? - Its an old car and I can't afford to put too much more money into it. There comes a point when it is cheaper to buy. There is just over 220,000 km on it, fuel pump, ignition coil and ignitor have been replaced, oil changed fuel filter changed all fluids good. Thanks
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Bryannewhite
April 13, 2010.



Hi bryannewhite. Welcome to the forum. What were the previous problems? And do you know why the oil is overfull? If there is a leaking injector, raw fuel could be running into the oil after the engine is stopped. That will make the level too high and the oil will be thinned out. Thin oil runs out of the bearings too easily resulting in the inability to build up normal pressure. The oil will loose its lubricating properties too.

If the oil was simply overfilled, rotating engine parts can whip it around and whip air into it. Air compresses and reduces the oil's ability to isolate moving parts from each other, and again, pressure won't build up.

A third possibility is simply a faulty sending unit. Chrysler had a rash of bad ones from a supplier in the early 1990s. Your mechanic can connect a mechanical oil pressure gauge to see exactly how much pressure is being developed. I would definitely recommend having the problem resolved. The last reply I just posted a few minutes ago was for a '93 Toyota that basically self destructed on the highway, and overheating of the engine and thinning of the oil may have been contributing factors.

Caradiodoc

Caradiodoc
Apr 13, 2010.