Need some help in diagnosing high oil pressure on 2004 Chevy Silverado v8. Here are the numbers. Ignition off oil pressure gauge reads 0, ignition on reads 80, engine running reads 80, turn engine off reads 0. I think the gauge should read 0 at all times when the engine is not running. Am I correct? What parts do I consider replacing. My scan tool shows no codes.
which engine?
[Solved] problem with new Oil pressure sending switch. Thanks
Another idea. Some of those Silverados were famous for the solder joints in the cluster cracking. I remember seeing a video where they removed the cluster, and re-soldered the joints on the back and it worked fine again. Maybe check youtube for videos on Silverado gauges.
I would replace the oil pressure sending unit.
https://www.autozone.com/external-engine/oil-pressure-switch/chevrolet/silverado-1500/2003
When you press and release the accelerator pedal, does the oil pressure needle move up and down?
The actual oil pressure needs to be verified with a gauge to see if the indicated pressure is accurate.
No the needle stays in the same position when racing the engine.
If you have the 6.0L engine. There is a service bulletin for wonky oil pressure indicator due to poor electrical connections.
Its the 4.8. Hope its not the cluster. That might be expensive. All the other gauges in the cluster seem ok. Can I add a stand alone oil pressure gauge rather than replace the cluster. If so any idea about which one and the cost?
1st step is to manually measure oil pressure
Wouldn't hurt to have the pressure manually tested to see where it's actually running.
If your scanner isn't high end, I'd rent one (autozone has the $4-5k models for rent) & go beyond what yours is picking up. You'd be surprised what codes hide on low end ones like mine.
Every instance that happened to me was after I put in a high volume pump & either busted the gauge/line when using old mechanical S-W models or cooked a sender.
If its a 5.3, those things always seem to run on the higher end from what ive experienced (mines between 50-70 depending on the load). The gauge clusters on those cars also go bad often, manually check the oil pressure to see what it really is, then go from there.
