oil pressure drops when sitting with foot on brake - 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 04-09-2005, 09:29 PM   #11
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Bet you a $5 that the sensor had some crap on the end of it...

Another thing I found out last night/today is not only are my gauges off for temp, oil and boost (new dash on way). But my rpm is off by about 200. Cfoote started honkin at me in the middle of traffic ...guess he spotted the Bonnie. So we hooked the Scanner up to his car as well... his rpm is off by 2-300....temp is off by close to 15-20 degrees.

Only way to check oil pressure would be a mechanical gauge. Given the new round of information I'd be inclined to wonder more about the gauges then the motor as long as the motor felt strong. But don't quote me on that. I've seen the other to be true more often.....and I like to believe gauges....
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Old 04-10-2005, 12:21 PM   #12
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Originally Posted by BillBost37
Bet you a $5 that the sensor had some crap on the end of it...

Another thing I found out last night/today is not only are my gauges off for temp, oil and boost (new dash on way). But my rpm is off by about 200. Cfoote started honkin at me in the middle of traffic ...guess he spotted the Bonnie. So we hooked the Scanner up to his car as well... his rpm is off by 2-300....temp is off by close to 15-20 degrees.

Only way to check oil pressure would be a mechanical gauge. Given the new round of information I'd be inclined to wonder more about the gauges then the motor as long as the motor felt strong. But don't quote me on that. I've seen the other to be true more often.....and I like to believe gauges....
Yes most ebery gage cluster will be a couple hundred RPM'* off, a few ticks shy on the speedo, a few tick off on the temp as well.... I so far have found that majority of them this way....

And I wouldn't have bought either one of my bonnevilles if they didn't have the gages

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Old 04-10-2005, 12:26 PM   #13
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I've got a new cluster on the way...I'm happy as long as I have a decent reference. But when your temp and oil gauges go into the red for 5 minutes then back to what looks like normal for the next 5 and back again... you tend to think you can't trust them.

Checked Dad'* 97 Grand Am last night (I'm a scanning fool!!!) His rpm was on the nose...but temp gauge is off.

Damn...none of these are accurate...GM is only giving us reasonable references...
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Old 04-10-2005, 12:45 PM   #14
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Quote:
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Damn...none of these are accurate...GM is only giving us reasonable references...
Exactly right. The point is to notice when a gauge is reading something _different_ than usual, not necessarily whether its reading ever represents the gospel truth...
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Old 04-10-2005, 04:01 PM   #15
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Most stock guages on average cars are a bit inaccurate. For example, my toyota does not have a tach, but people that installed an aftermarket tach on their identical truck, and compared it to an identical truck that had a factory tach they found that the factory tach is abut 200 rpms off. With our trucks, its simply a different guage cluster, the cheaper one with no tach, and one with a tach as part of the SR5 package.
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