Question about 1990 Ford F150

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Oil pressure gauge starts fluttering after truck is driven 15-20 miles and you pull up at stop light. As soon as you accelerate it stops ? oil pump going bad?

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Could be oil pump, also could be sending unit. When did you last change oil, is oil low? If it's been a while try putting in high mileage oil with higher viscosity, 20w50 for example

Posted on Aug 19, 2010

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Recently had oil changed. Soon after, oil light started coming on w. alarm sound. We check oil and it's always full. Stops if I shift to neutral, resumes dinging when I shift back into drive.


I would suggest you have the oil pressure checked with a manual gauge. It sounds to me like you might have a restriction at the sump tube and your engine has low oil pressure.

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The oil light came on whild driving my 1999 Lexus RX300 and the engine shut down. After pulling to the side of the road, I turned the igintion switch off and then on and the car started and I drove i


The oil warning light is telling you the oil pressure has dropped below 10psi which does not always mean the oil level is low.
When the oil pressure drops, the power for the fuel pump is cut for safety reasons. You would not want the fuel pump to keep going if you were in a wreck and the engine stopped but the key switch was still on.
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If the light comes on again, you would need to have the pressure checked with a mechanical gauge.

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After I have driven for about 10 - 15 minutes the oil light comes on when I stop. I goes off as soon as I accelerate. The oil level is with in normal limits.


change the oil sending unit, A cheap fix, is the oil the proper weight, how long since change and filter. Im sure if you do those it will fix. if it doesnt then your pump is weak. to check the pump pressure you can get a mechanical gauge and hook the line provided with the gauge using the hole location of the sending unit and start car so you can get a real reading not a light. anything lower than 35 psi is no good. either bad pump,worn bearings (cam/rod). you didnt mention year or milage of vehicle

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2004 Doge Ram 2500 5.7 Hemi 190K mile had oil pressure gauge drop to ZERO and check gauges light come on and engine shut down.. Check oil 1 guart low, add oil. let cool. crank up, good gauges drove home 45...


If the valve lifters are quiet you most likely have oil pressure even with gauge showing "0".Sounds like the oil pressure switch going bad.I would try that first.

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check the oil viscosity,it might be too old(driven for toomany miles)..

if thats not ityou might need to get the oil preasure lubricating pump checked,and id suggest you do it fast or theres a lot of engine wear and tear.

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