Question about 2007 Chevrolet Tahoe

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2008 tahoe oil pressure is at 20 psi on start up and then drops to 5 psi at idle after engine warms up also will go to 20 psi at 2000 rpm and drops back to 5 psi at idle

Posted by jew1264 on

  • Randy Light May 11, 2010

    Wow, Is the engine making any noise? How many miles on the vehicle?

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Jose

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I had the same issue. I changed the oils filter. That solved the problem

Posted on Nov 11, 2013

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Richard Scordino

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If you hear any knocking or ticking when the pressure is reading low, do not drive it 'till you have it diagnosed.
If the engine isn't noisy, you may have a pressure sending unit going bad. I'd definitely put a mechanical gauge on there just to read the actual pressure. If it is low, you may have some debris on the pump pickup screen that is obstructing oil flow Normally if it wasn't as low as yours is, I'd use an additive to dissolve the gunk but at 5psi you may do damage before the screen is clean enough so I'd recommend you remove the pan. If the mechanical gauge reads normal, replace the sender and don't bother with the remainder of what I am going to say.
If you remove the pan and find nothing on the screen, check the engine bearings for wear. If worn the correct way to repair that is to remove the engine as debris often will remain in the internal passageways and return to damage anything you put in there. Pump replacement is only necessary when you have bearing damage. Pumps do not generally fail unless they are contaminated. It will not hurt to replace one if the screen is obstructed as some debris can enter the pump and lower its pressure capacity somewhat but if the screen isn't blocked, do not blame the pump for the low pressure...you will be wasting your time and $ changing it.
Good luck...any further questions, just ask!

Posted on Mar 13, 2010

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