Really Low Oil Pressure and Overheating - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-15-2005, 09:57 PM   #1
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Default Really Low Oil Pressure and Overheating



but why!!!???

I just got done changing both trans cooler lines and valve cover gaskets. Still runs at that temp or above and at WOT never gets near the halfway for the oil pressure.
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Old 07-15-2005, 11:54 PM   #2
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is it steady or jumpy? if jumpy, it might be the board.
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Old 07-16-2005, 12:05 AM   #3
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Jesus... That'* low pressure. Get a mechanical guage on there.

You know... Melling makes replacement oil pumps, You could do the timing chain while you're in there too.
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Old 07-16-2005, 12:09 PM   #4
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I agree get a mechanical gage on that car and see if the Pressure gage on the dash is telling the truth....

And at 240F things are cooking pretty good in there..... Thats toooo hot

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Old 07-16-2005, 01:20 PM   #5
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Absent the overheating, I'd say the gauge was faulty. Concur with getting a mechanical gauge on there to see if it'* accurate.

If it is, you've all ready toasted the bottom end, and possibly the entire engine. Is it making any "no oil" noises-clicking, like that?

I'd pull the pan and see if the oil inlet is clogged. Oil pumps seldom fail.
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Old 07-16-2005, 01:26 PM   #6
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Quote:
Originally Posted by Bob Dillon

Absent the overheating, I'd say the gauge was faulty. Concur with getting a mechanical gauge on there to see if it'* accurate.

If it is, you've all ready toasted the bottom end, and possibly the entire engine. Is it making any "no oil" noises-clicking, like that?

I'd pull the pan and see if the oil inlet is clogged. Oil pumps seldom fail.
I have to agree with you on the Oil Pumps hardly ever failing... I have not seen 1 3800 oil pump fail.... Usually if the oil pressure is truely low, the bottom end is history...

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Old 07-16-2005, 01:45 PM   #7
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Quote:
Originally Posted by jr's3800
I agree get a mechanical gage on that car and see if the Pressure gage on the dash is telling the truth....

And at 240F things are cooking pretty good in there..... Thats toooo hot
Doing that today.
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Old 07-16-2005, 01:48 PM   #8
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Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by Bob Dillon

Absent the overheating, I'd say the gauge was faulty. Concur with getting a mechanical gauge on there to see if it'* accurate.

If it is, you've all ready toasted the bottom end, and possibly the entire engine. Is it making any "no oil" noises-clicking, like that?

I'd pull the pan and see if the oil inlet is clogged. Oil pumps seldom fail.
I have to agree with you on the Oil Pumps hardly ever failing... I have not seen 1 3800 oil pump fail.... Usually if the oil pressure is truely low, the bottom end is history...
thats always true if u can get a gauge on it or drop the oil pan and see if u see any metal shavings u might have spun a bearing
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Old 07-17-2005, 01:20 AM   #9
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My grandfather has a 1995 bonneville that has the same problem with oil pressure. The guage is in an identical position as yours when idling, but does go up some while accelerating. I suspected sludge blocking oil passages and poured 1/2 can of seafoam into the crank. It seems to have helped some, but I don't think it did much. Oil psi went up to about 30 or so. If i'm not mistaken, it should be at around 70, right? So, what can cause this. You all said that it is most likely not the oil pump, and I don't see how a worn out bottom end can cause low pressure. His car runs fine btw, no "low oil" noises, no knocking or anything. It has about 120,000 miles on the engine, but it does burn quite a bit of oil.
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Old 07-17-2005, 01:26 AM   #10
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i think 70 is a bit high actually, we are talking about idle right? i know once mine gets warmed up the oil pressure settles down to about 40 at idle, and i think thats where it supposed to be
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