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Found 3 results

  1. Approximately 2 years ago while driving my CEL came on. The code reader indicated low oil pressure and the oil pressure gauge was around 17-20 at idle. I changed the oil and filter and the pressure returned to normal (oil change #1). On that oil change I did two filter only changes. When due according to the oil life indicator I changed oil and new filter (oil change #2). That oil and filter was changed according to oil life indicator (oil change #3) Today while driving, once the truck warmed up, (15% on oil life monitor) the oil pressure dropped to 0 suddenly and shut engine off light came on. I pulled over shut the truck off and waited, checked oil (plenty of it), and started the truck back up. Oil pressure came back to normal and then dropped back to 0. I was close to home (<1 mile) and was able to limp home with start-stopping multiple times to maintain oil pressure. I changed oil and filter (oil change #4) and oil pressure returned to normal. Can anybody comment on what is happening? I would like to avoid running into an oil pressure issue on a longer trip, if I am only addressing the symptom and not the cause. Could the cause really be the filter getting full, or the oil degrading despite the oil life indicator suggesting there is more life?
  2. Hey everyone. I have a unique one here, 2008 Silverado had a backfire issue. When it would go into 4cyl mode and as soon as it would go back to 8cyl it would backfire. Run great other then that, done all the normal checks, plugs, compression ,fuel pressure and so on. All checked out and no ses light. So I tuned off the AFM with HP tuner and done a VLOM mode consisting of cutting the tower gaskets and blocking the oil feed to the VLOM with a bushing like what crazed performance repair uses . Note I have done this tune and VLOM mode over 30 times with success on many 5.3 engines. This time I lost oil pressure on first start up after the modification. The day before the truck had 40-45 cold 30-35 hot and 30 in gear. Done the VLOM mode and first stat up I noticed it was barely 20psi and at 160 degrees it already dropped to almost 0. No engine noise, drove the truck and it runs fantastic now but has the pressure problem. I checked pressure at the sender location with a manual gauge and it in fact is low, around 5 pounds, 1500 rpm maybe 10. Checked it at the block plug in front close to the oil pump 50 psi on cold start then drops to 30ish when idle goes down to normal, hot idle it is at 12ish but when revved the least bit it will raise quickly to 30-35. I cant get myself to believe this is coincidence of something falling that immediate .Is it possible a lifter is loosing oil pressure at the tower? Thanks for any input and I will post what the problem and not leave a open thread so everyone can benefit.
  3. Preface: 06 Sierra, lq9, 165k Currently showing 40psi at cold start and stays there until coolant reaches operating temp. Hot idle will usually sit around 32psi some times dip down to 25psi. Will not go over 65psi at WOT. It used to never be lower than 40psi at idle and would peg out to 80psi at WOT. I changed the oil pressure sending unit hoping that was it, no change. I have not hooked up a mechanical gauge to check it. Looking for some thoughts. Is my gauge cluster just malfunctioning? Oil pump? Pickup tube o-ring? Engine trash? Let me know what you think. I read once upon a time something about gm saying that the engine is only supposed to produce 10psi for every 1000 rpm. I don’t buy that.
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