91 F150 5.0L Oil pressure flux

Old 10-26-05, 07:08 PM
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91 F150 5.0L Oil pressure flux

When my truck is warmed up the oil pressure drops at idle, big time, put it in Park, it goes back to normal, truck was parked for almost two years, I changed all fluids, as a matter of fact I have changed the oil three times, within 1500 kms. just to make sure all the crud is out. Any suggestions?
Old 10-27-05, 05:54 AM
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suggest checking pressure with a known reliable mechanical oil pressure guage just to get an accurate reading at where the oil pressure is at when hot and at idle in gear.
if the pressure is low could be an oilpump problem or bearing clearance problem such as worn main bearings with excessive clearances.
if the pressure is ok suspect bad oil sending unit or guage.

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