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1993 Ford F-150 Oil pressure fluctuation

Tiny
TOTANKA09
  • MEMBER
  • 1993 FORD F-150
Engine Performance problem
1993 Ford F150 V8 Two Wheel Drive Automatic 329K miles

Recently my oil pressure began to drop to extremely low when the motor is warmed up. Have changed the oil and the oil filter and it still does it. It is only after I have driven it long enough for it to be warm, and it only does it at low RPMs. When I give it gas it goes back to normal range.
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Saturday, May 22nd, 2010 AT 8:48 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

I would be checking for a faulty oil pressure relief valve first, start here.

Mark (mhpautos)
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Saturday, May 22nd, 2010 AT 9:01 PM
Tiny
TOTANKA09
  • MEMBER
  • 2 POSTS
Hanks. Is that the same thing as the oil pressure sending unit?And where is it located?
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Saturday, May 22nd, 2010 AT 9:56 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

No the switch is a pressure sensitive sender that transmits the pressure readings to the gauge, the relief valve is part of the oil pump.

(mark mhpautos)
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Saturday, May 22nd, 2010 AT 11:18 PM

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