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Vacuum leak and low compression; If you have a vacuum leak can it lead to low compression in one or more cylinders?
Topic Started: Sep 6 2011, 11:01 PM (3,584 Views)
vikasintl
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I am trying to understand if there is any relation between vacuum leak and low compression?

lets say you have a vacuum leak somewhere ...and you don't know about that and you check the compression
can it show low compression like 80,120,140 on respective cylinders? or there should be other reason for this type of compression?
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Coche Blanco
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Troll Certified

bad valves cause that
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allmountain40
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Bad compression can cause low vacuum, not vice versa. Low compression on one cylinder is typically caused by a bad exhaust valve on that cylinder in these engines. A vacuum "leak" will only cause high idle and backfiring. :thumb
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Stiffchezze
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Sir Metrologist

Nope. The things that can cause bad compression:

1) Bad valve/broken valve
2) Bad piston rings
3) Bad Head Gasket
4) Bad/Broken Piston
5) Broken Rod
6) Misaligned/Broken timing belt. Causes the valves not to close.
7) Cracked block

Your numbers indicate either 1,2,or 3.

Anyone else want to chime in? Am I missing anything? :hmm
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starscream5000
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Got 70 MPG?

I'd say a combination of 1 & 2.
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vikasintl
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starscream5000
Sep 7 2011, 08:14 AM
I'd say a combination of 1 & 2.
You are so right ...
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