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Q: Chevy 5.3l - Lost oil pressure, why?

asked by on

So I was idling my 01 Tahoe 5.3L down a mountain trail last night and my "check oil pressure" light came on and I checked the pressure gauge and sure enough there was ZERO oil pressure...I immediately stopped the engine and checked my oil level, I still had full oil (I changed my oil and filter 90 miles ago with mobile 1 synthetic) and there was no coolant in the oil, I started the Tahoe back up and heard a loud ticking noise (probably cause no oil pressure for valves/lifters). I noticed there was some oil being pushed out the headers onto the exhaust manifold, and also some underneath that appeared to possibly be coming down from the oil cooler. I checked my coolant and didn't appear to be any oil in the coolant...I was only another mile or two from the trail head, so I cautiously idled back down to the trailhead/highway and shut the truck off, it never overheated or ran hot...ran normal with the acception of no oil pressure and the loud ticking noise. any ideas?

My car has 156000 miles.
My car has an automatic transmission.

A: Hello - since you didn&#39;t appear to be l...

Hello - since you didn't appear to be leaking oil in a significant way (busted oil line, hole in the pan), I suspect that the oil pressure relief valve may have been stuck in the "relief" position. Some of the early 5.3l engines had trouble with this - galling in the pressure relief valve bore. Pull the plug, spring and ball out to be sure the spring hasn't broken. Light tapping on the block may be required to release the stuck valve. Good luck!

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A: Hi there. use a mechanical oil pressure ga...

Hi there. use a mechanical oil pressure gauge and check for oil pressure on the engine with the engine running. If there is oil pressure, then the engine is if but needs to have another oil flush for contaminants in the engine. If the oil pressure is at zero, then the oil pump has failed and needs replaced or the pickup tube has too much buildup and preventing flow to the oil pump, which will damage the oil pump. Even if a bearing failed, there will still be oil pressure. I recommend replacing the oil pump on the engine and cleaning out the pickup tube. The oil pump to your engine will be on the front of the oil pan and right behind the timing chain. You will need to remove the timing chain cover and timing chains to get to the oil pump. Then you will also have to remove the oil pan to remove the bolts that hold the oil pump in place. Then the pump can be taken off and replaced. Once the pump is replaced, the pickup tube is cleaned out, and new oil and filter is in the engine, start the engine and make sure that there is oil pressure. If you need further assistance with your vehicle, then seek out a professional, such as one from Your Mechanic, to help you with the oil light on and engine ticking noise issue.

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