Oil Pressure issues

Asked by Oct 06, 2015 at 02:32 PM about the 1999 Chevrolet Tahoe 4 Dr LT 4WD SUV

Question type: General

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??

6 Answers

30,135

first thing i woul do is change the oil and filter and the sending unit...

2 people found this helpful.
113,695

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.

1 people found this helpful.

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

160

Going to save you a lot of headach. 1) change to thicker oil and new oil filter. See if the helps. 2) since you are getting oil pressure when driving fast, it's not the oil pump. Change out the oils sending unit. See if this helps. 3) oil pan area. Change or clean out oil pick up screen. See if this helps. 4) check your oil guage cluster to see if it's working correctly. See if this helps. 5) here's the bad news of all else fails than it's your worn out cam bearings. Meaning engine rebuild. If you know somebody you can get it done cheap like I did or you can spend more than the price of your cars worth. That's all to it. I went through all of them and finally got it fixed. 2005 Tahoe with 200,000 miles on it.

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