Posted by casebro on Monday, March 01, 2004 at 12:57PM :
In Reply to: #2 piston, low comp. posted by Bill Gibson on Monday, March 01, 2004 at 11:51AM :
Even 1 bad cyl could be headgasket, if the 'blown' part acts as a reed valve allowing flow in one direction. It's only bad if less than 80% of the good ones. What do the good cyls show? Could also be carbon, stuck or tight valve. Check valve lash first. If it's rings in one cylinder, you'll have lots of blowby puffing out of vent.Wet/dry test is pretty useless and erratic, it will give different results depending on amount of oil squirted in, and timing of cylinder when oil is injected. Blowby= bad, low cyl w/out blowby= something besides rings.
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