Need help.

[ohio5pt3]

So today after sitting for about a month I hopped in the 07 tahoe ly5. On start had some noise that went away within a few seconds figured no shock it's been sitting. Drove about a 1/4 mile and was sitting in line at the dunkin before taking the kids to the sitter and ding ding ding oil pressure alarm. Shut it off and pushed it over out of line. Check the oil barely in on the stick. Wtf. Called some and had them bring me a couple quarts. Out it in and started it up maintained 20psi at idle and Increased with rpm figured crisis avoided. Drove another 1/4 mi to to grab some oil and wtf lost pressure again shut it off and coasted into the parking lot. Checked it again meh still slightly low so added another qrt. Perfect read at this point. Holds pressure good to go right. Nope. Pull out and go to head to the sitter drops pressure. So against my better judgement I started. And coasted on and off till it got it home.no noise the whole time but now trying to narrow down what it could be. Oil sending unit? Pump? Cam bearing? I've been kicking around the idea of doing a afm delete cam and gears. At this point if I would do that I'd go with a high flow oil pump new timing chain, tensioner the whole thing. At this point I hope it's something simple I don't really want to dump a ton into it I have 2 brand new cars this is the beater but only has 108k on it and I love the thing lol. Any help would be great

 

[Dantheman1540]

If the motor was quiet id bet it's the sensor.

They are cheap enough and easy to replace

 

[drakon543]

could just be as simple as gunk in the sensor port aswell. however 0 oil on the stick is a loss. did you check it shortly before it being parked? anyway aside from the loss of oil you can always stir up extra debris when something is run low. i know alot of gm vehicles had a screen infront of the oil pressure sensor. running it low then refilling could have pushed some stuff into that screen.

 

[wjburken]

Make sure your oil pan is full.

Get an analog pressure gauge on your motor to see what the actual oil pressure is.

Look all around your motor for any leaks.

Hold a white cloth a few inches from your tailpipe and see if you get speckles of oil on it.

As others have mentioned, there is a screen under your oil pressure gauge that can get plugged up. If your analog gauge reads good, then I would pull the oil pressure sensor, throw it away, pull the screen and clean it then put a new OEM oil pressure sensor back in.

If the analog gauge shows low oil pressure, then that is a whole different path. I would try and look under your intake manifold and see if you have a loose VLOM bolt or 5. That could be a source of both low oil pressure and oil loss.

A bad o-ring on the pickup tube would cause low oil pressure as well.

 

[ohio5pt3]

Thanks for all the feedback it may be the weekend before I can dig into it. Hopefully one of the simple things fixes it. If not I'll fix it and add smiles per mile.

 

[CaptainAmerica1]

My 2007 did this to me back in June or July. I was doing WOT pulls for Diablew tuning and I thought welp that’s that I hurt the motor. Pulled over, checked the oil, it was about a quart low so I added that. Started back up, held pressure fine till I got back on the highway. Took about 3 miles and back to zero oil pressure. Rinse repeat and finally called the tow truck. My mechanic fired it up two days later (this happened on a Thursday) and said it’s fine what are you talking about. I had him swap a new screen, replace the sender and all’s been well ever since.

 

[Jason in DLH]

Oil pressure sensor filter was clogged on mine (like others have mentioned) that lead to 0 oil pressure reading. Simple fix. Hopefully it’s the same for you and nothing major!

If it is a plugged sensor filter a bolt this size helps with removal/installation of the filter..

 

[ohio5pt3]

Anyone killed the afm while they were in there? Figure if I haven't had a issue yet avoid it if I can.

 

[wsteele]

Anyone killed the afm while they were in there? Figure if I haven't had a issue yet avoid it if I can.

A lot of people here have turned off their AFM, but what that means goes from pretty simple (plugging a dongle into your ODB port or having a tuner turn it off in the PCM firmware) to fairly involved, with new lifters, cam and lots of gaskets (as a starting point down that path). What did you have in mind?

 

[Jason in DLH]

A lot of people here have turned off their AFM, but what that means goes from pretty simple (plugging a dongle into your ODB port or having a tuner turn it off in the PCM firmware) to fairly involved, with new lifters, cam and lots of gaskets (as a starting point down that path). What did you have in mind?

Is it necessary to do all new lifters, cam, etc for AFM disable or will the Dongle suffice?