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First, check the oil level. Is it the oil service light? If so have the oil changed and reset the monitor. If it is indicating low oil pressure you will need to put a manual gauge where the pressure sensor is and get a reading. If reading is ok then put in a new sensor. If manual gauge shows low or no pressure the tow to a shop. Better yet , take it to a shop asap.
1. Oil Pressure Gauge Not Working
You will notice this happens when your oil pressure gauge is not reading, whether the engine is turned off, idle or running. Try to step on the gas to rev up the engine. If the oil pressure gauge still doesn't change its reading, your gauge is busted. It's best to replace it as soon as possible because you won't have any idea if your car is already overheating or not.
2. Oil Pressure Gauge Reading Too Low
When your engine is idle, the oil pressure gauge will have a low reading. When the engine starts running or when you're already cruising or on the freeway, your gauge's reading should have increased. If it stays on a low reading, then you now your oil pressure gauge is broken.
3. Oil Pressure Gauge Reading Too High
Another common oil pressure gauge problem is when your oil pressure gauge is reading too high when your engine is idle or when it's turned off. Rep
check the oil pressure first, it should read around 10 to 14 psi. If pressure is inside the range then your pressure sensor is bad. If lower or reads 0 psi your got a engine problem, further diagnosis needed.
Good luck.
If there truly was no oil pressure it would make a horrendous rattle sound from not only the rods but especially the hydraulic valve lifters. It sounds like probably the pressure sensor or the wiring, or both are not reading correctly. The older Chevy V8's had the pressure sensor on the side of the block, under the exhaust manifold where it would just cook it and make it leak and not work right. I always kept a direct reading pressure gauge with hose and adapters in my tool box when I felt I couldn't trust the onboard gauge. Many times it proved the gauges and idiot lights wrong.
the oil sending unit that screws in the block beside the oil filter may be faulty, the worst thing would be the oil pump its self the regulator valve on it
That is probably a defective oil pressure gauge or a broken oil pressure sender, it reads 80 psi just because that is the maximum value allowed.
Pressure can be verified by reading it with a gauge tool.
If you really have pressure over 70 psi when engine is running then start replacing the oil filter, and check that the oil lines from pump are not obstructed, if there is nothing in there then replace oil pump.
If instead the gauge reads 80 with engine off, that is a defective pressure gauge.
Are you referring to the oil pressure gauge on the dash? If so, that is most likely the oil pressure sending unit having gone bad. The sensor runs about $40 - 50 (at least the last time I had to replace one on that engine). They are not terribly difficult to replace and I believe its a three wire sensor located back side of the engine, on the passenger side area. Its in a kind of tight spot and takes a bit to get it completely screwed out, but it can be done.
When they go bad, they typically will cause the gauge on the dash to read maximum oil pressure. You should be okay to run like that until you can get a new sensor as long as it is reading maximum oil pressure on the gauge and not low or no oil pressure on the gauge.
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