compression test - one low cylinder

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Old 07-01-2005, 06:01 PM
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Default compression test - one low cylinder

Hoping to get some help. I am looking at a used 4000kq and the compression test was:

#1 172
#2 175
#3 170
#4 135
#5 168

From reading previous posts it seems like these are within factory limits, but what could the low compression reading on #4 mean. Seller indicated it could be valve seal?

The car is out-of-state so I have not seen it personally, but it appears in great shape and the seller seems straight up about everything.

Any thoughts? Thanks
Old 07-01-2005, 06:16 PM
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Default not a valve seal.

the valve seat, though, could be damaged. the rings could be worn a bit, or the head gasket might have a small leak.
Old 07-01-2005, 06:18 PM
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Default Re: not a valve seal.

Is it something to be overly concerned about in buying the car? I have just enough knowledge to know it might be a problem, but not enough to know about the solution! Thanks again
Old 07-01-2005, 06:21 PM
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Default as long as it's within spec, it should be okay.

strange that the one is so much lower than the others. i'd have the guy do a leakdown test; i have a feeling the rings in that cylinder might not seal as tightly as the others.
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