should you remove all the spark plugs do get an accurate result from a compression test, or is 1 at time ok?
compression test
Oct 26, 2003
2 Replies
If you're doing a cranking compresion test, all of the sparkplugs would be removed, throttle wide open and fuel and spark delivery disabled. If you're doing a running compression test, only the sparkplug for the cylinder being tested would be removed. If you're doing it electronically, no sparkplugs need to be removed.
It's best to test hot, one at a time. If plug access is tough, than test all cylinders cold, and realize readings could be bogus.
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