Oil pressure fluctuating
Oil pressure fluctuating 2002 C5 - replaced oil pump about 2 months ago after having losing oil pressure one day, which I confirmed with a mechanical gauge. Found the bypass valve on the pump to be stuck and I replaced with a Melling unit. Did not find any metal shavings in the oil or filter at that time.
(https://ls1tech.com/forums/generatio...-pressure.html)
Since then, I've daily driven the car (probably 2000 miles since) and everything has been solid until yesterday I noticed at a redlight that my oil pressure gauge was fluctuating a bit. It would be at 40-45psi like normal then randomly creep down to ~25 psi and after a couple sounds shoot back up to 40 psi. Drove the car today and noticed that even when driving at steady state RPM it would fluctuate as much as 20-30psi in the same manner. Revving the engine did increase oil pressure.
Oil pressure sending unit was last replaced about 6 years ago. I'm planning to start by replacing the sending unit again but given the timing since I last had pressure problems, seems too convenient for it to be a coincidence of a failing pressure sender right after a failed oil pump. What's the best/worst case scenarios? Worst = spun rod bearing maybe?
(https://ls1tech.com/forums/generatio...-pressure.html)
Since then, I've daily driven the car (probably 2000 miles since) and everything has been solid until yesterday I noticed at a redlight that my oil pressure gauge was fluctuating a bit. It would be at 40-45psi like normal then randomly creep down to ~25 psi and after a couple sounds shoot back up to 40 psi. Drove the car today and noticed that even when driving at steady state RPM it would fluctuate as much as 20-30psi in the same manner. Revving the engine did increase oil pressure.
Oil pressure sending unit was last replaced about 6 years ago. I'm planning to start by replacing the sending unit again but given the timing since I last had pressure problems, seems too convenient for it to be a coincidence of a failing pressure sender right after a failed oil pump. What's the best/worst case scenarios? Worst = spun rod bearing maybe?
Only seems to do it when the engine is warm. No easy way to get a mechanical gauge on it while it's warm so I may just replace the sensor and see if there's any change.
Could this possibly be a pinched o-ring on the oil pick up or would that have shown up much sooner after the reassembly?
Could this possibly be a pinched o-ring on the oil pick up or would that have shown up much sooner after the reassembly?
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Joined: Jul 2020
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Same issue help any one Only seems to do it when the engine is warm. No easy way to get a mechanical gauge on it while it's warm so I may just replace the sensor and see if there's any change.
Could this possibly be a pinched o-ring on the oil pick up or would that have shown up much sooner after the reassembly?
Could this possibly be a pinched o-ring on the oil pick up or would that have shown up much sooner after the reassembly?
