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Old 08-26-2012, 10:05 PM   #1
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Slight knock or Tap at startup

Well, to be honest, this board and the pentastar engine head problem has made me a bit paranoid. However , when my new 2012 JKU sits for several days, I get about 3-5 seconds of a tap at start up. It's only at start up and goes away quick . Everything else runs quiet. (for now) I have heard its the oil just coming up thru the engine a well as some "other reasons". For those who really know on this forum, can I have your advice on this . ?? Would appreciate your mechanical honesty.

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Old 08-26-2012, 10:22 PM   #2
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we're told it's normal. just a few seconds for the oil to get on the valvetrain. don't worry about it. this is different from the idle ticking noise that's being reported.

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Old 08-26-2012, 11:02 PM   #3
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I get it too.. less since I switched to synthetic.. but that could be an anomaly..
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