Join Date: Nov 2000
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Re: compression test?
I know this isn't exactly what you asked, but do you get a lot of blowby? As in the crankcase spewing out exhaust gas under pressure from seals and pcv filter at the air filter, covering the air filter with oil? This is also an indication of poor sealing rings, as the pressure from above the pistons is leaking into the crankcase and escaping from the crank everywhich way it can, usually carrying oil with it.
Definately do the compression test on each cylinder. Also consider a leakdown test, which involves pressuring each cylinder one at a time with compressed air and seeing how well it seals. You will hear where the air is leaking out, intake, exhaust, etc if it's a bad valve.
It's not that time consuming to remove the head to remedy the problem if it is a valve or a head swap. You can do it in an afternoon.