Question about 2003 GMC Envoy

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Oil pressure dropping at idle in my 2005 gmc what to do

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6ya6ya
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Posted on Jan 02, 2017

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  • 47 Answers

SOURCE: low oil when engine warms up gmc sierra 1995

30-40 psi of oil pressure is fine for many vehicles including your GMC. I am assuming that the truck has more than 100,000 miles on it and still has the original engine in it. By rule of thumb you only need 10 psi per 1000 rpms in a typical street driven engine to give adequate oil pressure to keep the bearings from oil starvation. The oil pressure is typically higher when initial start up occurs because it is more viscous due to the temperature of the oil as the engines oil warms up the visconsity thins out and the oil flows more smoothly. The drop in oil pressure is a normal occurance. Above 45 is more than required for a daily driven street engine. I believe that the specs on that engine only list 30- 45 psi.

Posted on Dec 07, 2008

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SOURCE: 1992 gmc chevy 350 wont idle when warm

This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.

Posted on Apr 17, 2009

Molson02536
  • 3854 Answers

SOURCE: 1995 GMC Sierra z71 oil pressure dropped- need advice on this

The oil pump is in the oil pan and needs to be dropped and being a 4WD you also need to drop the front axle pumpkin to remove the oil pan and replace all the gasket needed. Start with the easy and replace the oil pressure sending unit, it's on the back of the engine to the passenger side of the distributor. You can go to Auto Zone and pick up a new Oil sending unit, just make sure your get the right one, "Sending Unit" Looks the same are the oil pressure sensor but the unit reads the pressure, the other just signal a light to go on and off. It's an easy fix like replacing a spark plug. 

Posted on Jun 29, 2009

  • 59 Answers

SOURCE: low oil pressure 93 GMC P/U w/350 motor w/205,000 miles gauge

While engine is running, open the cover where you add oil to engine and see if you see a good flow of oil, if good flow, could be as easy as replacing oil sending sensor. got to realize that if poor maintenance history your engine may not be building enough pressure at iddle to move your hydraulic operated valves, only when you rev it up it will pump enough to run smooth. if running engine too long, you may cause more damage to other engine components such as crankshaft and cam shaft bearings. if you can spare a few bucks, have a good mechanic check your oil pressure with a mechanical gauge. another cheap option is to replace oil pump. last resort if you love your truck as much as we do,replace engine or rebuild it. At 205,000 this is a normal symptom, other than timing chain problems, most engines don't make it that far. hope this helps!

Posted on Mar 01, 2010

  • 1 Answer

SOURCE: Where is the oil pressure sending unit oa a 2005

my 2004 yukon engine oil sensor is at its highest, what is the problem

Posted on Apr 13, 2010

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2 Answers

How to replace an oil pump on a 2005 Gmc Envoy XUV 4-wheel drive


Are you wanting to change the oil pump because the oil pressure flickers while idling after the engine has warmed up? If so change your oil pressure switch (located next to oil filter) first, to see if that fixes your problem. Sometimes dirty oil gets trapped in the switch and breaks down when the engine is warm. Replacing the oil pump is a major project requiring dropping the oil pan. Check U-Tube or a Haynes Repair Manual.

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What should oil pressure be at idle?


Depending on age of engine, temp, and type of oil, normal idle pressure is 25 - 35 psi.

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2005 GMC envoy Oil pressure drops to zero when stopped if in a drive thru the car over heats. AC off its ok. Oil level/pressure fine replaced clutch fan wire harness(pigtail)replaced water pump.


The oil pressure drop indicates more problems.

Oil pressure drops to zero at idle on 2002 GMC Envoy after ...

www.fixya.com/cars/t7880379-oil_pressure_drops_zero_idle_2002_gmc Jan 18, 2011 - You could have three possable problems that I can think of. 1) Your oilviscosity is too low and you need to change it to a higher level. A 5w/30 .

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My 2005 Envoy's low oil pressure light will come on when I am at a stop and my car is ideling. My oil gauge will also drop. I just change the oil and filter about 1 month ago


When engine is idling the oil pressure sign can come up and that is OK. However if you've noticed that gauge shows much lower oil pressure that a bad sign. Show it to knowledgeable mechanic (but don't be lured in the engine replacement; ask for a root cause - it may be oil receiver or oil pump). Also I hope there's no oil puddles under the car? What about oil level?

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That may be normal. The battery gauge would drop since the alternator is not charging as much at idle as when you are driving. It should stay above 12 volts as long as the heater or headlights are off.
Same thing with the oil pressure. It should stay above 35psi at idle.

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If you don't have an oil pressure test kit to measure actual engine oil pressure, try replacing the oil pressure sender 1st and recheck. Its the cheapest and easiest to do .

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You need to pull the pressure sensor and install a manual test gage, (borrow from Autozone or other chain part store) that is the only way to verify the engine is not loosing oil pressure.

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2001 GMC safari engine noise- sounds low, like spun rod bearing. BUT.... seems actually QUIETER under a load. NOISIER at idle. Oil pressure is low at idle. I was trying to do a "relearn...


not a bearing problem as they get noisier under load or rpms , not quieter
oil pressure always drops around 10% of full pressure at idle more if the oil is of low viscosity ( 5w10 or 15) use a mechanic stethoscope to determine noise source at idle

Apr 18, 2017 | 2001 GMC Safari

1 Answer

Low oil when engine warms up gmc sierra 1995


30-40 psi of oil pressure is fine for many vehicles including your GMC. I am assuming that the truck has more than 100,000 miles on it and still has the original engine in it. By rule of thumb you only need 10 psi per 1000 rpms in a typical street driven engine to give adequate oil pressure to keep the bearings from oil starvation. The oil pressure is typically higher when initial start up occurs because it is more viscous due to the temperature of the oil as the engines oil warms up the visconsity thins out and the oil flows more smoothly. The drop in oil pressure is a normal occurance. Above 45 is more than required for a daily driven street engine. I believe that the specs on that engine only list 30- 45 psi.

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