How do you do Compression checks?
How do you do Compression checks?
How to? I'm used to the old car motors were we would ground out the coil wire so you didn't damage anything. Do ya'll disconnect anything or ground out anything to prevent damage on the newer computers? Is there a How To thread? Thanks
Road Captain
Joined: Mar 2008
Posts: 712
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From: Punta Gorda, Florida
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
Remember if the # is low squirt some light oil in there and if the # comes up then the rings are the culprit. A leak down tester is another great tool for diagnosing compression issues.
HDF Community Team
Joined: Jun 2006
Posts: 12,776
Likes: 2,607
From: san antonio
Pull plugs and ground them; make sure the battery is fully charged; connect the tester, hold throttle wide open and crank the engine through enough cycles, say 5-6, but crank until the needle stops. A weak battery will produce inaccurate results. Plus what the others have said. You can test hot or cold; in my experience there won't be much difference if the top end is tight; a little but not much.
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