Phzr499
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question on how to do a leak down test on 2007 phazer any suggestion would much aperciate the help thanks
With the compression readings you posted there is no need. You have a issue with the engine. But if you insist you would use a adapter of the same size and thread as the sparkplug apply air with a guage in between and see if it holds it. Would have to ensure decomp is not engaging the valve of 1. Have you check your valve clearance and timing yet?