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Old 03-04-2009, 11:21   #1 (permalink)
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confused Oil gauge problems

I have a 97 f150 with a 4.2 L engine. When the engine is warm and I stop the oil gauge will start to bob up and down. I replaced the oil pump when I had the heads replaced and also the oil sending unit was replaced about a month ago. There is no engine knock to tell me that it is starving for oil. I will replace the oil filter and it will be okay for about a week then back to the same problem.
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Old 03-10-2009, 15:53   #2 (permalink)
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Re: Oil gauge problems

Oil starvation isn't always associated with an engine knock. I'd try running a GOOD known engine cleaner, such as Auto-RX or SeaFoam. Seafoam can be found at most auto parts stores and there are several different ways you can use it. It's good for cleaning out carbon deposits and sludge; freeing up oil passages.

Worst case is your main bearings are on their way out. Once oil pressure drops significantly (when the pump tests OK) then it's a sure sign that the main bearings are shot at that point.
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Old 03-10-2009, 17:17   #3 (permalink)
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Re: Oil gauge problems

Might also try hooking up an aftermarket gauge and see if it still does it. Could be a bad gauge in your dash or a wiring problem.
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