Oil Pressure Drops to Zero in Park - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-04-2005, 08:57 PM   #11
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Default Re: Oil Pressure Drops to Zero in Park

Quote:
Originally Posted by Garb


B) Oil guage (It also displays "Check Oil Level" for a minute or two when i frist start driving, but it goes away)
I have been geting that message when I first got my Bonne. It stays on for about 20-30 sec then goes out. They put a new oil sending unit in whan I got the car but i still get the caution light. I have been told that there is another oil sending unit inside the oil pan. Maybe that one is the culprit.
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Old 08-04-2005, 09:00 PM   #12
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Quote:
Originally Posted by BillBoost37
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Couldn't it mount to the fuel pressure test port on the fuel rail?
Uh..... I believe you are thinking we have a fuel issue....not an oil pressure issue.


There is no oil sending unit in the oil pan. There is an oil level sensor mounted to the front side of the pan. Maybe they meant that.
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Old 08-04-2005, 09:23 PM   #13
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Would doing a scan read accurately? Doesn't it use a different sensor when doing diagnostics? Or am I thinking of a different sensor?
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Old 08-05-2005, 09:52 AM   #14
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:[/quote]



There is no oil sending unit in the oil pan. There is an oil level sensor mounted to the front side of the pan. Maybe they meant that.[/quote]

The guy that told me that is a GM mechanic where I get my oil changes done. When I got my first oilchange after I got the car he did say that the oil sending unit appeared to look new.I told him about the "Check oil level" light kept coming on and that'* when he told me there was another sending unit inside the oil pan. Could you verify that there is no sending unit inside the oil pan. Maybe the one that was replaced is defective. Would appreciate it. Thanks.
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Old 08-05-2005, 10:03 AM   #15
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I'm pretty sure that'* only an oil level sensor is in the pan. Only sender is that one by the filter. The pcm sees the same as the gauge because it uses the same sensor. Which gives us the reason for needing the mechanical gauge.
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Old 08-05-2005, 10:11 AM   #16
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Quote:
Originally Posted by BillBoost37
I'm pretty sure that'* only an oil level sensor is in the pan. Only sender is that one by the filter. The pcm sees the same as the gauge because it uses the same sensor. Which gives us the reason for needing the mechanical gauge.
Thanks for replying. The sending unit was "replaced" at the Sabb dealership where I got the car. I reckon the next time I have an oil change I will have them put in a new GM sending unit. I have been looking at that caution light coming on for the past two years. Thanks again.
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Old 08-05-2005, 10:24 AM   #17
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Mmm I believe they were fairly different from certain year groupings. Maybe they put the wrong one in.
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Old 08-05-2005, 10:32 AM   #18
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The oil pressure sending unit is on the lower portion of the timing cover. The oil level sensor is an on/off type. It sees enough oil or not enough oil. The is an oil pickup in the pan, just like any other car, but it is purely a tube with a flare and a screen on the end. If the screen gets clogged, there is a valve that will open due to pressure difference and allow oil flow, and not likely to fail.
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Old 08-05-2005, 04:55 PM   #19
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Quote:
Originally Posted by BillBoost37
Mmm I believe they were fairly different from certain year groupings. Maybe they put the wrong one in.
That'* what I am beginning to think. When I test drove the car I tole the salesman about the light and he said that would be fixed. No telling what kind of oil sending unit was put in. On the next oil change I will make sure I get a genuine GM part.
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Old 08-05-2005, 06:41 PM   #20
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Alright, I havent been responding butIve been reading. So it comes down to me probably not needing a mechanical gauge in there? Like I said my oil is old and I'm going to put some stabilizer in there too. Just to clairify so this isnt a really stupid issue, we should have 5 qts of oil right?
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