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Old 07-19-2019, 08:22 PM   #7
RustyPile
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Join Date: Dec 2017
Location: Elkhart, Texas
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Re: Correct Spark plugs?

Quote:
Originally Posted by Freddo View Post
..........<snip>..... I have been wanting to do a compression test on this motor for a while. I did the test while I had the plugs out and most of the plugs Landed in the 140 to 155 psi range which I thought was excellent except for cylinder number seven which came out at zero. (Ouch!) That was a surprise because it is a very smooth running engine....<snip>....... Thanks!
Those two statements contradict each other.. Either your compression test is flawed, or your perception of a "smooth running engine" is flawed.. With zero compression that cylinder is completely dead, leaving a "gap" in the firing cycles.. The miss is most evident at curb idle.. I suggest you either conduct another accurate compression test or have an experienced person take a look/listen to the engine...
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