View single post by Greg Fletcher
 Posted: 01-05-2011 09:40 pm
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Greg Fletcher

Joined: 03-11-2005
Location: Lake Nacimiento, California USA
Posts: 421
This problem has nothing to do with altitude. Black, wet plugs do not bode well. That indicates that fuel is not being burned in the combustion chamber as it should. There could be several causes. If this were my car, the first thing I would do is a compression check on each cylinder as this will tell you immediately what's going on. If compression is down considerably or even nil in at least one cylinder, that points to worn valves, rings or both.