C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Oil Pressure erratic. HELP

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Old Jul 27, 2008 | 05:48 AM
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Default Oil Pressure erratic. HELP

Just recently my oil pressure dropped below 7psi and the red light came on. I changed the filter which seamed to be clogged. My pressures are now better but still have me scared. Idling it will usually hop around 15-27 after the engine is warm. 2000 rpm it will hop around from 25-45 when I come to a stop it will hop around the 20's and dropped a few times to 8-11 psi then jumps back to around 45 when accelerating.

This has me extremely worried and I stopped driving the car because of it.
Does it sound like my oil pump going out or maybe a clog of some sort? I recently bead blasted the valve covers and I though I did a good job of removing all the glass beads but i believe that is what was clogged up in the filter when i changed it after this problem started.
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Old Jul 27, 2008 | 08:01 AM
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The most likely culprit would be the Oil Pressure Sending Unit.These do occasionally go bad and sometimes do exactly what yours is doing.Unless you had a great amount of dust and residue left from the bead blasting I wouldn't think it would be enough to clog a filter. Except for the pressures jumping around it sounds like they are plenty high enough. WW

Last edited by WW7; Jul 27, 2008 at 08:05 AM.
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Old Jul 27, 2008 | 10:42 AM
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I agree with WW7, change the sender first. I believe it takes a very deep well 1 1/6" socket, it's by the distributor.
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Old Jul 27, 2008 | 06:47 PM
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Thanks, got a new sender on order. I'll port back when I replace it and let yall know
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Old Jul 27, 2008 | 07:33 PM
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In my case, it was a bearing....

I hope for your sake, it's the sending unit.
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Old Jul 27, 2008 | 09:32 PM
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Originally Posted by James Paradiso
I changed the filter which seamed to be clogged. .
Seemed to be clogged? How do you mean seemed? What came out of the filter when you turned it up? How did the oil look that drained out?
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Old Jul 27, 2008 | 10:01 PM
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Originally Posted by schrade
Seemed to be clogged? How do you mean seemed? What came out of the filter when you turned it up? How did the oil look that drained out?
Why on earth would it seem to be clogged?
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Old Jul 27, 2008 | 11:17 PM
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looked like silvery sludge, figured it was some beed blasting material that got in there.
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Old Jul 28, 2008 | 08:26 AM
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This changes things, If you had silvery residue in the filter and a oil pressure drop at the same time, it sounds like you have a spun bearing or some other internal failure. Especially if it is enough metal to clog a filter.The only other thing I can think of is if the bead blasting material did infact get into your oil and it was silvery in color and your oil pressure sender went out at the same time, then maybe you would be ok,but it sure sounds like a bearing.(Thanks Schrade for asking more questions)..WW

Last edited by WW7; Jul 28, 2008 at 11:23 AM.
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