low oil pressure/high temp dummy light

anikek · May 2, 2014

I have 03 limited 4.6, in warmer temperatures if I let off the throttle, let's say at a stop light or slowing down, my low oil pressure/high temp dummy light comes on along with my oil pressure dropping to nothing. Now the odd part, if I shift to park or neutral, everything goes back to normal. Same rpms as it was in drive. Does anyone have an idea why this occurs and a fix? Thanks in advance!!

FordFool2 · May 3, 2014

Either your oil pressure is really low (< 5 psig) or the oil pressure sender (switch) is bad.

The oil pressure gauge is kind of a misnomer. Ford has been using a pressure switch to signal the gauge through a resistor to make it read 1/2 scale normal. The pressure switch is set around 5-8 psig so when it opens oil pressure is pretty low. A good engine should have 25-40 psig. You need to take this seriously. At idle, low rpms create a lower oil pressure output from the oil pump.

First thing, change out the oil sender/switch. See if that takes care of the problem. I have personnally seen them go bad.

low oil pressure/high temp dummy light

anikek

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FordFool2

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