Question about 2002 Oldsmobile Bravada

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Oil pressure gauge, warning

I have a 2002 Olds Bravada w/120,000 miles on it. I've taken care of this car very well and have had only minor problems. But here's an issue I cannot solve. After running my Bravada on the highway (higher speeds) or around town for a while I stop at a light and when the RPM's go to idle (600) the gauge reads 40 but suddenly drops off dramatically. Then the ''check gauges'' light comes on followed by the text LOW OIL PRESSURE & then STOP ENGINE. However, if I give it only 100 more RPM (700) the gauge returns to 40+ and the warning goes away. I've replaced the oil pressure switch and added STP. No evidence of main bearing problems. Mechanic supposedly checked the pressure manually but it was not acting up for him so he did not check it when it drops off. I've read it can be the oil sump tube clogging or a bad oil pump (not easy or cheap to replace or check) but it seems wierd that it acts up randomly. Oftentimes I run the SUV for long periods with no problem so it is not beacuse the oil ''thins''. Lastly, if the pressure drops off and I give it 100 more RPM (making the warnings go away) the RPM's seem to fluctuate slightly between 700-800 making me suspect an ignition or electrical problem. When I shut off the SUV after it has the oil pressure warnings, it shuts off hard. Like it's still getting some fuel. Short of taking it to a dealer to get my face ripped off in fees I'd like to know what it is. I cannot afford for a dealer to experiment with the vehicle at my expense. Does anybody know what this problem is?

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  • Samuel Charles Spriggs May 11, 2010

    This is a tough one.



    I speculate that the eingine running after you shut it off means it is dieseling. Common caues for dieseling are low octane fuel, ignition timing off, or carbon buildup on the pistons/valves.



    Not familiar with the oil pressure sending unit on this vehicle -- is it electrical, i.e., does it have a wire connected to it?

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I also have an 2002 Oldsmobile Bravada with 123K miles on it. I have the exact same problem that just started, did you ever figure out what to do to correct it? Someone told me to check the idle flow valve but this part is expensive and they werent sure if it would correct the problem.

Thanks

Posted on Aug 09, 2011

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DUE TO NORMAL WEAR THE SMALL SPACES BETWEEN THE MOVING PARTS IN THE ENGINE MAY HAVE INCREASED IN SIZE AND MAY REQIRE A HIGH MILEAGE OIL OF THICKER WEIGHT. IF YOU ARE CURRENTLY USING A 10W-30. TRY A 15W-40 TO COMPENSATE FOR LARGER GAPS WITHIN THE LUBRICATED PARTS. THIS SHOULD HELP TO SOLVE THE LOW OIL PRESSURE PROBLEM. IF 5W-30 IS WHAT YOU'RE USING, THEN GO TO A 10W-40. HOPE THIS HELPS. BEST OF LUCK. THANKS FOR AN HONEST RATING AND FOR USING FIX-YA.

Posted on May 11, 2009

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