Question about 2004 Chevrolet Tahoe

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Erratic oil pressure gauge

I have a 2004 Tahoe (5.3L). When idling oil pressure holds at 40lbs the whole time. When engine is reved it holds a 60lbs. when driving gauge gets erratic and warning bells go off, some times it will read ok Most of the time it will be erratic. I have changed the oil pressure sending unit and dash cluster and there has been no change. I have made quite a few 200 mile trips with no problems or knocks. Just got back from a 600 mile round trip. Any ideas

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  • Chevrolet Master
  • 3,425 Answers

Have you changed the oil filter? Change the oil and filter.(USE the AC Delco filter and the 10W - 30 oil..(Wal-Mart oil is fine - it's made by a major refinery - HINT- Walmart does not own a refinery!!!) They buy the oil, have it put in their marked containers and sell it cheaper then others) I ONLY use Wal-Mart oil in everything!!..you might try a pint of Lucas oil treatment..
See if the new filter helps.. sometimes they are defective and block oil flow and the pressure makes it flow..

Posted on Oct 18, 2017

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Posted on Jan 02, 2017

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  • 58 Answers

SOURCE: 2003 Tahoe, 5.3 liter vortec flex fuel. Engine

this is a comon problem on chevy 00-06 models a computer ground ,it seems ok at sight but inside it's just holding a few wires ,get under the car on the driver side passenger there you should find a two ground wire goin to the block a big, and a small ,the small one gets coroded try to fix it and let me know how it goes ok.

Posted on Feb 25, 2010

toneman2121
  • 775 Answers

SOURCE: 2004 Silverado 4.8l Oil pressure fluctuates from

have the oil pressure checked, asap, at a service center to make sure the oil pump is not going bad. i would also take into consideration the suggestion offered by fixcar001. i would also refrain from driving until you've made sure i's not just a monitoring problem.

Posted on Apr 19, 2010

  • 1608 Answers

SOURCE: oil pressure gauge is reading 80 psi. I had the

The oil sending unit is located on the engine block behind the drivers cylinder head area.You have to climb up on the motor to see it cause it is hard to see behind the wiring harness.You may also want to purchase a new sending unit because it is very long and you might need to buy the sending unit socket to replace it.Hope this helps.Good luck.

Posted on Jul 20, 2010

Z71guy
  • 154 Answers

SOURCE: Oil pressure gauge erratic reading full pressure

Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Silverado instrument cluster repair

Posted on Oct 08, 2010

  • 157 Answers

SOURCE: 2008 1500 suburban, pickedcar up after getting

If your sending unit is one wire, unhook it from the sender and place a jumper wire from wire to ground. Turn ign on, gauge should pep high PSI. Two wire plug, place jumper between contacts of wires (unplugged). Same thing. What this does is isolate the gauge. If gauge pegs on test, replace sender. If it does it again with new sender, it's the pump. But it's probably the sender.

Posted on Nov 02, 2010

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this is a comon problem on chevy 00-06 models a computer ground ,it seems ok at sight but inside it's just holding a few wires ,get under the car on the driver side passenger there you should find a two ground wire goin to the block a big, and a small ,the small one gets coroded try to fix it and let me know how it goes ok.

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