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1990 chevy 5.7 low oil pressure at idle

Engine has about 70 psi oil pressure using a 1/2 cordless drill to turn distributor and oil pump. Start engine and oil pressure drops to 0 psi ant idle. second new pump same problem. new main and rod bearings new crank. checking oil pressure at port by distributor with mechanical gauge. Pls. help i am at my end and need to fix this like yesturday

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  • 129 Answers

One of the problems they have had with the 5.7 is a weak oil sending unit. Your would be an electric one if i aint misstaken. Change the sendding unit or change over to a mecanical one.

Posted on Nov 29, 2012

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Posted on Jan 02, 2017

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  • 64 Answers

SOURCE: changed oil pressure switch,still no oil pressure

The fuel pump on that model runs through the oil pressure switch so that if the truck looses oil pressure,It kills power to the fuel pump to prevent engine damage.you need to find the cause of the low oil pressure reading(possibly a bad oil switch).That would be the cheapest place to start,or have it checked with a mechanical gauge.Good luck,
ChevRev

Posted on Mar 30, 2009

VWdan
  • 114 Answers

SOURCE: oil pressure drops to 0 at idle

OOO not good sounds like some of the head gasket got stuck somewhere, or the gauge or sender is bad or got knocked around when repairing the head gasket. I would check that first. If that checks out will need to drop the pan to see if something got stuck in the pickup tube,might as well change the pump while you are there. Or worst case some thing wrong with gasket job impeading oil flow back to bottom of the engine. Was the oil and filter changed ?if so pull out filter and see if an chunks are stuck in it now. And change oil and filter again. Sorry that was out of order I had a long day

Posted on Apr 24, 2009

  • 13 Answers

SOURCE: 1999 Chevy Blazer - idle fluctuates

oil pump might be going bad

Posted on Aug 03, 2009

  • 318 Answers

SOURCE: oil pressure gauge goes to 0 when idled, but goes

You could try thicker oil or stop using synthetic or add some lucas oil treatment or change the oil. The sender could be bad too. A diag is in order because if there is no presure the engine will soon die.

Posted on Dec 09, 2009

  • 6982 Answers

SOURCE: 2008 tahoe oil pressure is at 20 psi on start up

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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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


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!

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You are on the right track,

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