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Old 08-30-2012, 12:47 PM
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Unsettled Oil Pressure

I have a 51 Chevy pickup with a new GM 350 crate with only 235 miles on it, a 700R4 tranny. When I start it and run it at about 1500 rpm the oil gauge (new Classic) will bounce as much as 45 lbs. I hold it at 2000 rpm and the pressure sits at about 90 lbs. When I drop it to 1500 rpm the pressure drops to 75 lbs. At that point it will vacillate between 65 and 90. Sometimes the movement is erratic and sometimes it moves around slowly.
I have air but this is when nothing is on. I worry there is something wrong with the oil pump.

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Old 08-30-2012, 01:06 PM
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It's most likely just a bad guage but you'd better find out for sure before you drive it anymore.
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Old 08-30-2012, 01:38 PM
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My Jeep (RV toad) had erratic pressure indicated, I bought a cheapo Autozone mechanical gauge to test, and it was a bad sending unit. Cheap insurance to verify it though.
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Old 08-30-2012, 01:51 PM
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Is it a mechanical gauge if not you might want to just replace it with one.
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Old 08-31-2012, 03:45 PM
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No it's an electric Classic gauge. I think I'll hook up a mechanical like was suggested and see if it's the gauge.
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Old 09-01-2012, 08:49 AM
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X2 on hooking up a mechanical gauge first.



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