I have a 2012 Chevy Suburban LT 5.3L. About a year ago it developed a misfire. Only occasionally would it give me issues like going into limp mode but it just seemed like a spark plug or coil pack, figured I’d get around to it eventually. I know it is not the smartest move but I have had a lot going on and just no time to fix it. In around August the stabilitrak came on saying it needed to be serviced, not really worried about that either. About a little over two months ago I did an oil treatment since the car does burn oil. Two weeks later in November I was driving and lost all oil pressure. Car was low on oil so I did add some no biggie figuring it would solve the issue, or at least I thought, car is still saying no oil pressure.

I went on to replace the oil pump and while doing so I noticed the timing chains were shot, so I replaced that too. I obviously replaced the pick up tube o-ring as well. My Car was still having low oil pressure! I then gave a full oil change with very expensive oil and the best quality oil filter I could find. Oil pressure was perfect! I drove it up the road a few miles, no issues besides a slight mis but nothing like before. I decided the next day to make sure it was fine for my wife to drive if needed and decided I’d take it to town and back. I let the engine warm up, car was fine thus far. I drove about 15-18 miles and the oil pressure dropped to 25 psi and then all the way down to zero once I hit a hill. The oil light came on so I pulled over into a parking lot, shut the engine off, and turned it back on. Said I had oil pressure. I got out of my car and checked the oil. On the dipstick I didn’t see much, of course I was driving so it’s not gonna be accurate but it was like I didn’t change the oil. I opened the oil inlet and there was some white stuff around the inlet. I towed the car home absolutely lost. Next morning I checked the oil and it’s completely full. coolant also looks great so I’m not thinking it’s a head gasket.


it’s not smoking like crazy, has a little white smoke once started but disappears once car is warm. Also besides the misfire I’m not hearing a whole lot of engine noise. One thing I forgot to mention is it does need a rear main seal but was slightly leaking but I didn’t see anything around it
when I checked for oil leaks the other day after driving it half way to town. I really don’t think that has much to do with it. has anyone else had this problem?

 

you may want to verify the oil pressure with a mechanical gauge. And replace your screen.

 

We replaced the oil switch drove it around for a hour. First start up 40 PSI, after warming up at idle it’s 30-35 psi, and driving it’s a little above 40. So far so good. We have a flashing check engine light, stabilitrak is now having issues, interior lights won’t cut off, and battery keeps dying. Also rough idle, could it be a relay and just need a tube up?

 

you need to run a professional diagnostic scan to see what they mean