carpenter8589
Forum Newbie
Posts: 5
Reg: 06-19-12
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06-19-12 10:06 PM - Post#2239329
I have a 93 Chevy 1 ton dually with a 454, and I noticed a miss after it warmed up. When it misses, the oil pressure gauge spikes. It does this while driving, and also at idle. When idling, it seems like just a slight misfire. The oil pressure gauge normally sits at 30, in the middle of the gauge, but when it misses, it will spike all the way to 60. What is causing this???
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rockfangd
Contributor
Posts: 584
Age: 27
Loc: Utica ny
Reg: 04-13-10
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06-19-12 10:13 PM - Post#2239331
In response to carpenter8589
ground problem? anything else funny when it happens. Look at the ground on the passenger side rear of the engine
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 someotherguy
Moderator
Posts: 23559
Age: 43
Loc: Texas
Reg: 08-01-03
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06-19-12 10:25 PM - Post#2239333
In response to rockfangd
I agree, and welcome to Chevytalk. Sure does sound like a ground issue causing some circuits to try grounding through improper paths. Not only should you check the one from the rear of the block to the firewall, but also the same spot on the firewall runs down to the frame. Also there are going to be several grounds from the harness onto the intake, though I forget on the TBI 454 where they exactly hook up. On the TBI small block they attach at and next to the thermostat housing. Probably in a similar area on the big block.
Richard
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rockfangd
Contributor
Posts: 584
Age: 27
Loc: Utica ny
Reg: 04-13-10
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06-20-12 11:05 AM - Post#2239472
In response to someotherguy
exactly. Yeah the ground from the engine to the frame causes all sorts of issues. and if that one is bad likely the frame to fiewall is just as bad
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carpenter8589
Forum Newbie
Posts: 5
Reg: 06-19-12
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06-20-12 05:00 PM - Post#2239593
In response to rockfangd
Ok sweet thank you, I thought it might be an oil pump or something. As you can see by my site name, I am a carpenter guy, and not much of a muh cannic. See? I can't even spell it right. But I think I could even take care of a corroded ground. Haha. Thanks again.
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jimshoe52
Forum Newbie
Posts: 62
Loc: Texas
Reg: 01-08-12
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 06-21-12 01:36 PM - Post#2239851
In response to someotherguy
I've got a 1990, 5.7L. I think I've seen a couple of those around the engine compartment. I'm thinking that I might have a ground problem since I've been hearing that proverbial high pitch sound (not loud) through my radio. It seems to increase as the engine revs. Would that be a probable cause?
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rockfangd
Contributor
Posts: 584
Age: 27
Loc: Utica ny
Reg: 04-13-10
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06-22-12 09:56 PM - Post#2240377
In response to jimshoe52
very possible
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