Diagnosing Envoy Low Oil Pressure - Part 2 

Thanks Don!

Norma Sibaja Thank you!

@@KevinNadeau I have a 2005 GMC Envoy Denali 5.3 liter. it'll drive for about 30 to 40 minutes it will shut off it takes about an hour hour-and-a-half you're able to recrank it and it'll drive for another 30 to 45 minutes and repeat the same thing over and over. We have changed the fuel pump, crankcase position sensor, ignition module, multiple relays the fuse panel box under the hood had to computer rebuilt Andre program to the vehicle several things have been checked no issues whatsoever headed into the GM dealer two different times they can't find the problem to other mechanics have been unable to find the problem and I'm at wit's end. Any idea what it may be?

@@fla-tacomann5355 I'm not very familiar with the 5.3L motors, but my first thought is something electrical. Have you had the alternator tested? Is your battery good?

Man, I hate to hear that

Roajen Appreciate that. Be sure to check out my other videos where I find the real culprit of the low oil pressure.

Hope you're able to solve your low oil pressure issue. You are correct, the oil pressure gauge on the 4.2L motor is basically an "idiot light".

I ended up having to take the oil pan off and clean the pickup tube on my Envoy. Man, that was a big project.

@@KevinNadeau yeah.. I figured that was coming… I haven’t change my oil pressure switch. that I will get done.. And possibly have somebody else do the work to the clean out or both jobs.. Im to old for that stuff anymore..😎

@@KevinNadeau did you make a vid on that Kevin? If so send me a link please.. Thank Steven 😎

@@stevenjewett4537 Yes, I have several videos related to my oil pressure issues. Check the playlists on my channel👍

I'm no expert with AC systems. Are you sure the compressor is bad? Might be time for a new one?

Hi Kevin.. when I removed the old module under the dashboard I noticed that a few of the plugs had some green corrosion in the plug so I cleaned it out the best I could and I'm thinking that maybe the brake lights blew out and the running lights just continue to come on when I turn on the lights and do you think that the fuses for the left and right brake lights might have been blown... I just bought the GMC ENVOY SLT a few weeks ago and I'm just trying to figure out the problem so I can get a safety certificate and put the SUV on the road and enjoy it.. during the summer... Thanks again.. Ken. Ottawa Ontario Canada

Maybe, but I found it to be very easy to replace it from the bottom.

I actually did one today in my 05 envoy and it wasn’t as bad as I expected. Once the oil filter is off you actually have enough room for the socket and ratchet. Highly recommend getting the speciality socket for a few dollars. Best of luck to everyone !!M

@@stephenpurcell9268 thank you for sharing. i also have an 05 envoy and bought the oil sensor socket it was cheaper than the actual sensor lol can you give me the steps to replace it? so just get the oil filter out first? how do i do that? lol

Getting the filter out gives you more room to get at the sensor. A 74-76 mm oil filter cup will help if the oil change place over tightened the filter. Once you remove the filter the sensor sits sideways just above the filter mount. Remove the wiring from the sensor and the socket will fit over the sensor and you will have room for a ratchet as well. Hope this helps you as well !!! When replacing the filter just tighten it up hand tight. Always easier to remove for future oil changes !!!

@@stephenpurcell9268 thank you!! will try it out when it gets warmer. its -27° C right now where i live LOL

Here's a link to it, but looks like its currently not available. You could try eBay as well. amzn.to/2LFF55y

Yes it is.

Sam Robertson The gauge is what I had in the shop. The reading on the dash is not true pressure with the 4.2L motors.

Yes, I ended up taking off the oil pan to get to the pickup tube. The pan does have an RTV gasket, not rubber. Check out my other videos for the oil pan removal and install.

@@KevinNadeau yes I saw the other videos after I left this comment. Very informative and thank you for making them. I'm not looking forward to doing this

@@KevinNadeau so I'm all finished with my engine project and it runs great but there's a vacuum line coming from the left firewall and I cannot find where it goes. It's causing my idle to go up and down between 400-800 rpms

Do you mean driver or passenger side?

@@KevinNadeau passenger side

In my case, i probably shouldn't have, based on what i found. But if the low pressure light comes on because of a bad pressure switch, you'd probably be ok to keep driving. But drive at your own risk.

I did and now my engine is knocking

AC Delco is what I use 👍

@@KevinNadeau were u always using AC Delco or did u change to it after issue was resolved

Not necessarily. My problem was a clogged pickup tube.

@@KevinNadeau can you email me my email is coffman.carey@yahoo.com

Haha, thank you. But definitely not in as good of shape 🤣

Im having a low oil pressure warning in my envoy it tell me to shut off my engine should i keep driving it

@@Elcanaldeladri No! Go through and check for the problem. It maybe the pressure switch or it maybe something else.

Don't get rid of it. Try a new pressure switch first.

@@KevinNadeau You rule for responding so fast..! Soo.. Try the switch first even though it's doing literally the exact same thing as yours..? Down to the 20 min running time + idle throwing the low oil pressure & engine shut off warnings - but when I accelerate it "fixes it".. until I idle again..? I'm en route to gas station for kerosene, now. Guess I could bust a u turn and head to O'Reilly for a switch, instead.

@@kasiecastleberry Yes, try the easy fix first.

@@KevinNadeau didnt fix mine. 2002 envoy 150k im thinkinm kerosene as well but few good times and maybe one cheap oil change run it a bit then another full syn. also change oil filter from fram to Ac delco

Where’s your video lol