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2003 GMC Yukon no oil pressure suddenly, no noises

Tiny
SPENTONBARGAINS
  • MEMBER
  • 2003 GMC YUKON
  • V8
  • 2WD
  • AUTOMATIC
  • 133,000 MILES
We crossed the Kansas border on our way back to Ft. Worth, Texas. Car running fine. No noises.
we stopped for gas. When we started up again. No oil pressure. We drove a block. Didn't help. The guage, beeper and message on the screen all said no oil pressure. After towing 450 miles. The mechanic said, "not worth trying to fix the oil pump, we checked the inflow tube from the pan to the pump (external to the oil pan)."Needs a new engine.$4700. Now I had put on an AMSOIL
Bypass onto the cross member of the car, at 2,000 miles when I bought it new (so that I could get 400K+ out of the engine). Could it be the problem. So disappointed.
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Sunday, March 22nd, 2009 AT 10:01 PM

3 Replies

Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
Does the engine "rattle" when you start it up? What did your mechanic say is supposed to have happened that you lost oil pressure? Please advise.
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Monday, March 23rd, 2009 AT 12:37 AM
Tiny
SPENTONBARGAINS
  • MEMBER
  • 2 POSTS
No noises, just running fine. Mechanic says he
thinks it turned a cam bearing. That the oil pump replacement would be too costly. And it might then not solve the problem, and we would have to replace the engine anyway. But there have been no noises.
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Tuesday, March 24th, 2009 AT 11:13 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
I'm having a little trouble with the cam bearing theory. Even if you spun a cam bearing, you'd still have oil pressure.
Did your mechanic screw in an actual oil pressure gauge in place of the OP sending unit to check pressure?
Keep me posted. This one is going to be interesting.
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Friday, March 27th, 2009 AT 12:41 AM

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