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Low oil pressure problem

Tiny
BRUM08
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 170,000 MILES
99 chevy tahoe LT 4x4 low oil pressure reading only after its warmed up sitting at an idle and the same when I am in drive on the brake. Check gauges light comes on when it drops down to approximately 5-8 on the tack. As soon as I get on the gas the light goes off and the tack reads up to 13-16. No engine noise as of yet and only had to add one quart in 2 months. No leaks found. Has me wondering if the filtering screen for the oil pump might be clogged? I dont want to tear into it for nothing if thats not the problem. Any suggestions what could be causing this?
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Wednesday, May 25th, 2011 AT 2:59 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
This is typical of worn connecting rod and crankshaft bearings in high-mileage engines, but it can also be caused by a defective sending unit. The best place to start is by installing a temporary mechanical oil pressure gauge to see exactly what is happening. If the pressure really is low, switching to one grade higher viscosity oil might help.
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Wednesday, May 25th, 2011 AT 4:04 AM

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