Question about 1990 Ford F150

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Low oil pressure at idle

1990 F150 5.0 liter oil pressure guage is steady when engine is cold. After warmed up the oil pressure guage drops when engine rpm gets below 1000. Check engine light comes on also. Engine still sounds fine,no knocking. Where should I start to look? Thanx Jeff

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  • jefferycorin Mar 06, 2009

    don't know the dash guage just bottoms out.

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How low does the oil pressure drop?? is it below 40?

Posted on Mar 05, 2009

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1 Answer

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Hook up a manual oil pressure guage and take readings of the actual amount of oil pressure in the engine. It may be that the switch is bad even though it is new. It may also be that you have low enough oil pressure at idle to trip the switch. On my 2.0 liter the low oil switch turns on at 4.4 PSI at idle but when the engine is revved up it turns on below 26 PSI. You may also have 2 oil pressure switches, one for low and one for high. They would be located very close together on the oil filter housing. Make sure you replaced the right switch.
You want to get this straightened out quickly as VW engines are very unforgiving when you put off repairs. Hope this helps.

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