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Tom Wesenberg · 05-25-2012, 02:17 AM

A slow to close valve will show up on a vacuum guage with the engine running, but won't show up on a compression guage at cranking speed. Ethanol gas can cause sticking valves, and Sea-Foam will help to correct that.

05-25-2012, 02:17 AM	#12
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: #2 missing A slow to close valve will show up on a vacuum guage with the engine running, but won't show up on a compression guage at cranking speed. Ethanol gas can cause sticking valves, and Sea-Foam will help to correct that.