High Oil Pressure
Thread Starter
Cruising
Joined: Oct 2015
Posts: 11
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High Oil Pressure
Just had the ECM replaced in my 1985 Corvette and now my oil pressure seems to be running really high. It drops to around 43psi at idle, but when running at a steady speed of around 35-40, it jumps up and down between 55psi and over 80psi. If I am idling it and punch the gas, it jumps to over 80psi. Any thoughts?
Team Owner
Joined: Sep 2001
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From: Athens AL
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80psi is the max reading, when I last hit that it was the sending unit that failed. Sounds like yours has a spotty connector.
You should put a mechanical gauge on and read that.
You should put a mechanical gauge on and read that.
Thread Starter
Cruising
Joined: Oct 2015
Posts: 11
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How/where do put a mechanical gauge on? I am a female trying to get info for my son to help me out..THANKS!!
Thread Starter
Cruising
Joined: Oct 2015
Posts: 11
Likes: 0
Thank you!! What does the gauge look like? We have been told different things and do not want to get the wrong gauge. I have spent so much money on this car in the last few months, I certainly do not want to waste money buying the wrong type of gauge.
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Team Owner
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Just had the ECM replaced in my 1985 Corvette and now my oil pressure seems to be running really high. It drops to around 43psi at idle, but when running at a steady speed of around 35-40, it jumps up and down between 55psi and over 80psi. If I am idling it and punch the gas, it jumps to over 80psi. Any thoughts?
I'd think the replacing of the sender less expensive than the ADDING of another and certainly less complicated.
Use the orig GM # as a reference at your local auto parts store for a purchase. GM # 14078954.
Yours should have a single spade connector and be somewhat bell-shaped unless it's been changed. The sender uses I believe resistance of 3 to 90 Ohm. If you've a DVM you could check the sender at idle and appropriate greater RPMs and see what the sender is actually producing before removing to replace.
1st though - the ECM has nothing to do with the oil pressure gauge at the cluster - NOTHING - If the car runs the ECM I guess you could say is doing the greater part of it's job.
Last edited by WVZR-1; Nov 5, 2015 at 07:24 AM.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
For reference purposes, this is what the oil pressure switch and sender look like. Located behind the distributor. The oil pressure sender is the large diameter part with the single wire attached:
Last edited by Cliff Harris; Nov 6, 2015 at 12:49 AM. Reason: Corrected grammatical error.
Burning Brakes
Joined: Jun 2005
Posts: 1,191
Likes: 15
From: Wallingford Vermont
I with Cliff on this. Most likely the sender is going flaky. But I might also ,on an a chance, replace the oil filter. It's unusual, but a blocked filter can cause high pressure (via the bypass). Filter change is very cheap and easy. Although not as cheap as checking the sender with a Digital Volt Meter
Drifting
Joined: Mar 2013
Posts: 1,952
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From: Venice Cali.
A few questions come up
Was it working before ecm switch
Why did you switch ecm
Did you clean EMC connectors with electrical cleaner if they were exposed they could be dirty.
Who changed ecm
Good luck
Was it working before ecm switch
Why did you switch ecm
Did you clean EMC connectors with electrical cleaner if they were exposed they could be dirty.
Who changed ecm
Good luck