Low PSI @ idle - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-09-2004, 07:55 PM   #11
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ever think it might just be a bad sending unit? Mine used to do the same, until i bought a new one for 35 bucks and installed it.
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Old 06-09-2004, 10:01 PM   #12
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Quote:
Originally Posted by SSEimatt93
ever think it might just be a bad sending unit? Mine used to do the same, until i bought a new one for 35 bucks and installed it.

yea i did think bout that actully
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Old 06-09-2004, 10:28 PM   #13
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hmm, id have it hooked up to an actual pressure tester, just to verify it all.
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Old 06-10-2004, 01:06 AM   #14
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How many miles are on your engine? It is pretty much normal for oil pressure to very slowly drop over time as clearance increases on all the bearing surfaces under pressure. For cars over 100K mi., I have always used higher viscosity oils to maintain a better film when the car is hot and working. Oil pressure will increase with higher viscosity oils also. For cars that I know are pretty well worn, I have run Valvoline straight 50 weight racing oil. It is in my VW vanagon right now. When I purchased this van, it was ringing a low oil pressure alarm at idle when hot. Changed to 50WT, 8000 miles ago. So far, no light, no alarm, no knock, runs fine.

For tighter engines, you might consider Shell Rotella T 15W-40. This is an excellent oil with a superior additive package, that will provide better protection for a worn engine than 10W-30.

BTW, many years ago, I read in a Mercedes Benz owners manual that their engine (2.2l gasoline) needed a minimum of 7 pounds of oil pressure for each 1000 rpm (!)

Also, when you start your car, never rev it up or drive it until the oil pressure is up. I think more bearings are damaged by this than any other cause.

Just my $.02
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Old 06-10-2004, 04:21 AM   #15
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thanks.. the motor has 97,000 on it, one service writer suggested 15/40 or 10/40
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Old 06-11-2004, 03:30 AM   #16
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thjis is a recent issue, however i think the fact that the warm weather has come back might have somethin to do w/ it....
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Old 06-11-2004, 09:07 AM   #17
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Don't mean to steal thread.. but wat does a high pressure mean?
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Old 06-11-2004, 10:13 AM   #18
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my oil psi was low due to the lower oil cooler line after i replace that and the radiator with another oil cooler, trans cooler then i will be the coolest
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