Question about 2005 GMC Envoy

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Oil pressure gauge all over the place . Goes from no pressure to normal randomly. No motor sounds and temp gauge appears to be normal.

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Have the switch tested that senses the oil pressure. this seems to be faulty. good luck

Posted on May 08, 2010

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1 Answer

Temp gauge goes halfway very quickly


Three things to check. Is there enough anti freeze,Make sure the thermostat is working,and check to see if it has a pluged oil pickup in the oil pan they are known for plugging. Find the oil pressure sensor and screw in an oilpresser gauge to see what it has for pressure.

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When stopped at a stop light my oil gauge goes down and my temperature gauge goes up on my 94 Chevy 1500 truck. I just changed the oil yesterday? What could it be?


Both issues could be normal to a degree. The engine temp would go up some when the truck stops moving, and the oil pressure would go down some when the engine returns to idle.
Are the two gauges reading out of normal range ?

Jun 26, 2013 | Cars & Trucks

1 Answer

Oil pressure gauge reading


Normal is really any place in the middle of the gauge.
Depending on the age and condition of the engine, and the temp of the oil, oil pressure at idle should be at least 25-35 psi and at cruising speed between 40 and 60 psi.

May 12, 2013 | 1991 Chevrolet Caprice

1 Answer

96 chevy cheynne 5.7 vortechas about 40to50 pounds oil pressure when first sart in morning and when it gets to temp. it drops to 20to25pnds and at a stop it goes to 0 and gauge light comes on until i give...


Well it could be the sending unit for the gauge.
But odds are the oil pump or engine bearings are worn out.
As the engine warms up, the metal spaces expand and the oil gets thinner. The oil pressure drops some under normal conditions, but not more than 10 or 15psi. Normal idle pressure with the engine warmed up is probably 25psi.
You could check oil pressure with a mechanical gauge to make sure its not the sending unit.
Once the oil pressure starts staying below 20psi for long periods you'll start hearing noises.

Apr 13, 2013 | 1996 Chevrolet C1500

2 Answers

I have a 2001 dodge darango my oil pressrue gauge is not reading any pressure but motor is quiet and temp looks good


change the oil pressure sending switch on the engine
the old one is no longer working

May 19, 2010 | 2001 Dodge Durango

2 Answers

Oil pressure gauge all over the place . Goes from no pressure to normal randomly. No motor sounds and temp gauge appears to be normal.


Start by checking out what the sender looks like and its location, if you can't find a GMC or Chevy dealer either Autozone or Advance website has a page showing you where the part is located and what it looks like. Your problem is either the gauge, sending unit, or wiring harness. Sending unit is easier to rule out first. Pull the connector off the sending unit, spray some WD40 on the male and female connector parts and scrub gently with an old toothbrush and reassemble. If that did not help buy a new sending unit and replace it. Usually a deep socket is needed for this. If that does not work you are going to have to pull the instrument cluster and replace the gauge.

Apr 22, 2010 | 2005 GMC Envoy

2 Answers

Oil pressure gauge reads normal when first starts. as it warms up, gauge goes to zero. If I rev engine, gauge goes back to normal.


Two things...when it reads zero, is there any engine noise (tapping or knocking)? After you rev the engine does the pressure read normal at idle and function normally, or does it go back down? Either way, you should not drive the vehicle 'till you have a mechanical gauge (yours is electro-mechanical) put on there and the actual pressure is tested. The condition may be a bad sending unit, a bad bearing or possible obstructed oil pump screen. The repair is obviously different for each one and the price is as well.

Oct 20, 2009 | 2002 Jeep Grand Cherokee

3 Answers

OIL GAUGE GOES DOWN AT STOPS


I had the same problem with my 97 Wrangler 4.0..Change your antifreeze, replace with some new 50/50 mix...Also chanke your oil, replace the filter with a mopar filter and use stratght 30 weight motor oil...Solved my problem

Jun 24, 2009 | 1997 Jeep Wrangler

1 Answer

Gauges giving me trouble


Oil pressure sending unit probably bad.
Temp sounds ok.

Oct 24, 2008 | 2001 Jeep Cherokee

1 Answer

Oil pressure


i was having the same issue with oil pressure and i only had 55K on mine, i have since changed the cat and the exhaust manifold and the problem went away? might be a coiencedance but it makes since thinking like an exhaust brake would work

Jul 01, 2008 | 1997 Jeep Wrangler

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