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I have a 2003 Sorento with a 3.5 engine. When it is shifting between 1st and 2nd I hear a knock in my engine. At idle the knock is not there. If I rev it a little I hear the knock but if I rev it while in gear and foot on the brake it is quiet. I am ruling out a rod knock because it is not always there. Could it be a collapsed lifter? Has anyone else had this problem? it will not knock under load.
 

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2009 Sportage, 98 Sportage, 2012 Tata Xenon, 1944 Jeep
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Check the pulley / balancer on the front of the engine for tightness. A lifter is normally a "tic" ot "tap" sound rather than a knock. And yes a rod knock shouldn't come and go, it would normally always be there.
 
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