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  1. R

    98 XJ Tap/Knock at Idle - goes away at throttle

    98 XJ, 4.0, AW4, 139,000 miles I have a pronounced Tap/knock at idle that can be heard from several feet away and even in the cabin if you turn off the radio. I changed the oil and added 15w40 Rotella (Ive heard good things about the ZDDP, etc)and a quart of lucas to hopefully quiet it down...
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