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F-250 Diesel Oil Pressure low on idle

Tiny
CAROL
  • MEMBER
  • 2006 FORD F-250
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 106,000 MILES
I have a 2006 Ford Super Duty F-250, Diesel 6.8 with 4WD, My check gauges light comes on and I noticed no oil pressure on the gauge, I immediately pulled over, checked the oil which was fine. I did find that so long as I kept the RPM's up above about 800 the oil gauge showed good oil pressure as soon as I let it idle again the gauge showed no oil pressure again. It was cold this morning (about 30F) Can you please advise me what may be wrong?
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Tuesday, December 7th, 2010 AT 12:04 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the oil pressure with a mechanical gauge, if normal replace the oil pressure switch. If abnormal could mean oil pump and engine bearing.
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Tuesday, December 7th, 2010 AT 12:07 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
This could be an oil presser relief valve sticking, I would first check the pressure with a mechanical gauge and do an oil change with a good quality flush, let me know the oil pressure cold idle, hot idle hot 1500RPM's.

Mark (mhpautos)
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Tuesday, December 7th, 2010 AT 12:07 PM
Tiny
CAROL
  • MEMBER
  • 2 POSTS
I will get the pressure manually checked. I also recently heard that the engine would be impossible to run at no oil pressure, that this could be the sending unit malfunctioning or possibly a wire problem?
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Tuesday, December 7th, 2010 AT 1:13 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Some senders are hooked up to a cut off timer, if no oil pressure is detected after a few sec running they shut down.

Mark (mhpautos)
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Wednesday, December 8th, 2010 AT 2:22 AM

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