how much vacum is normal? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-16-2010, 04:32 AM   #1
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Default how much vacum is normal?

I had uim and lim gaskets changed on my 95 bonne w 3800 series 2 after I hydrolocked motor. Now I'm burning alot of oil and I just noticed that when motor is running and you open oil filler cap there seems to be alot of vacum and engine begins to sputter. I was thinking I fried rings when uim let go but I don't know if that much vacum is normal? Could someone let me know when they open there oil filler cap when motor is running does there seem to be alot of vacum.
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Old 06-16-2010, 07:01 AM   #2
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Check your PCV valve on your UIM. Seems like it might be stuck closed.
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Old 06-16-2010, 07:09 AM   #3
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Actually ... most likely it'* missing the lower o-ring. Did one a couple weeks back.

You should not have excessive vacuum at the cap.
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Old 06-16-2010, 09:45 AM   #4
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Yep, PCV valve. I'm thinking it'* stuck open or missing the O ring.
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Old 06-16-2010, 07:37 PM   #5
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You guys are good! Checked PVC and it was missing lower O ring. Replaced it and vacum went away. Now hoping oil consumption goes down. Thanks guys
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Old 06-17-2010, 07:23 AM   #6
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There'* a little saying that the buddies and I toss around "It'* my first time" Glad it was a quick easy fix.
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