Oil Pressure issues
My Tahoe 5.7L engine shows good oil pressure at start up, after driving a little while the pressure will drop to zero when I stop - but will increase steadily as I accelerate. But as I continue my travels the oil gauge will work correctly and show (approx) 35 psi when I come to a stop?? Took it to a dealer and he said I had 6 psi at idle - I am curious as to why the gauge will work properly from time to time? If this is an actual oil pressure issue, can I intermittently have good & bad oil pressure? The truck was in storage for a year and a half and has 136,000 miles on it, I do not know the history as I purchased it at an auction. Also I drove over the Railroad tracks once (very bumpy) and the oil pressure gauge dropped??
first thing i woul do is change the oil and filter and the sending unit...
Kelly is right about the oil, filter and the sender, the sender is a known failed part. The 6 lbs at idle is the bare minimum reading but still a pass, I would try running a little heaver engine oil, try 10W40 first.
The dealer is now changing the oil (using a GM Filter & Heavier oil), not sure if they changed the sender or not. If not I will do it myself. Thanks for the info!
I have a 98 doing the same thing. At a child startup, it has great pressure. Once the engine warms up, it loses oil pressure at idle. I have already replaced the sending unit, gages, filter, and oil. Is there anything else to check before I replace the oil pump.
I had the same issues. My oil pick up tube was clogged. After a full pan removal and deep cleaning it's back to normal
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