oil pressure dropping - 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 11-26-2006, 05:27 PM   #1
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Default oil pressure dropping

i have looked through past topics on this issue, and have found different answers, so i'm not sure what to do. I just changed the oil about 2 weeks and 200 miles ago. i put in 10W-30 valvoline high mileage and a fram filter (i know someone'* gonna rape me for using fram). About 2 days ago, the oil pressure dropped while i was idling and the car started beeping. i pulled over and checked the oil after letting it sit for a minute, and the oil level seemed fine. it only does this after i drive for about 15-20 mintues after the engine warms up, it doesn't do it right after i start it. this also only happens when i'm idling, if the car is above 2 grand RPM, it doesn't beep, and the pressure fluctuates as i drive. i added a little bit of oil and the problem lessened for a short while, but came back the next day. my research seems to tell me it would be the oil pressure sending unit. any thoughts?
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Old 11-26-2006, 06:32 PM   #2
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i am having the EXACT same problem! today i changed the sending unit today still does the exact same thing i hope someone can help us, i was allso told to try changing the oil pump? or it could be a berring or seal? so someone PLEASE help us, thanks
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Old 11-26-2006, 06:40 PM   #3
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Optimistically, the best idea is to check the real oil pressure with an oil pressure tester. If the low oil pressure is consistent, odds are it is not the oil pressure sender unit. The other option, if it is consistently low during idle it the pressure relief spring may be to blame. If you want to get the spring alone, you will probably have to order it from the dealer. I believe it is only a few dollars though. Not berating Fram, but they are one of the most restrictive filters on the market and as such can lower oil pressure. Let us know what you find.
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Old 11-26-2006, 08:19 PM   #4
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I checked into it today, Advaced Auto Parts sells a Oil Pump rebuild kit for $25.00 comes with spring and pressure reliefe valve.
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Old 11-26-2006, 08:44 PM   #5
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Fram filters are notorious for putting out low iol pressure.....

take the filter off, put on a AC Delco PF47, preferred or a Purlator and see if the OP is still low...im betting that it comes up alot
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Old 11-26-2006, 09:38 PM   #6
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im running a MOBILE oil filter but my problem occured befor i changed oil filters
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Old 11-26-2006, 10:01 PM   #7
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Quote:
Originally Posted by anotherbonneville
im running a MOBILE oil filter but my problem occured befor i changed oil filters
please start a new thread for your problems

the info i posted was for the orignal poster in this thread
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Old 11-26-2006, 10:19 PM   #8
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Low oil pressure is typically a symptom of a high mileage with worn rod bearings.

As far as rebuilding the oil pump, my opinion is to suggest against it. Our pumps are not the typical type that start to fail over time. Ours are a gyrating type that have no real moving parts to wear or break down and allow pressure to fall off.

My suggestion to both of you is to have your pressures tested with a mechanical gauge. If you don't, then you will not be able to confirm what is going on.

Fram or not.. it sounds like you both may be getting worn out bearings and after a mechanical gauge check will know more and we can suggest better from there.
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Old 11-27-2006, 02:28 PM   #9
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Found a picture of the oil pump

It'* built into the timing cover and driven off the crank shaft.

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Old 11-27-2006, 02:29 PM   #10
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Quote:
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Found a picture of the oil pump

It'* built into the timing cover and driven off the crank shaft. yes..that'* it under the 5 bolts.

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