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FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitFlowmaster's Force II Axle-back exhaust system for the 201FS: Wranger BRIGHT License Plate LED! Just $3! Great value

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Unread 07-13-2013, 10:11 AM   #16
pete1991YJ
Registered User
1991 YJ Wrangler 
 
Join Date: Mar 2012
Location: Niagara Falls, NY
Posts: 1,623
Its totally possible a burnt exhaust valve would do that. Or a cam thats slightly out of time relative to the crank. I would suspect the valve first. You can test it with the engine off, blow some compressed air into each cylinder one at a time thru the spark plug hole. Listen for any hissing in the manifold. See how long the cylinders hold pressure with a leakdown tester, available at summit racing.

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