Question about 2001 Ford Taurus

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Loses oil pressure after warming up and coming to idle lite go out after rpms pick back up

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Have you checked the engine dipstick to ensure that the oil level is correct? A very low oil level will cause the light to come on. Top up oil if necessary. If oil level is OK, then it is possible that the warning light pressure switch which is screwed into the engine oil pressure system is faulty and setting off light and needs replacing. There could even be oil leaking out of the switch. The switch is usually located near the oil filter and will have a wire connected to it.
If the oil constantly needs topping up you either have a bad leak or the piston rings are worn and not operating correctly. If the leak is bad, then there will be oil puddles under the engine after it has been stopped for a while. If it is a ring problem, then there will be grey oil smoke out of the exhaust while driving.
Worst case is that it could also mean badly worn engine bearings. It is unlikely to be the oil pump as these hardly ever fail.
Worst case is that it could also mean badly worn engine bearings. It is unlikely to be the oil pump as these hardly ever fail.
If the engine has not been serviced regularly with oil and filter changes, the oil can become very black, dirty and sludgy and cause restrictions in the lubrication system such as sludge blocking the gauze on the inlet to the oil pump and build up in the oil galleries. Poor oil flow from the pump will cause low oil pressure and continuing to run vehicle in this state will drastically shorten engine life.
If this is the case, then run some flushing oil product (ie. Wynns or Nulon or other reputable brand) in the engine, following the instructions on the container, and then drain and refill oil and change oil filter. You may have to repeat this process in a couple of months if the oil is particularly dirty.

Posted on Nov 14, 2010

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