Quick Question - Mid to High RPM "Slapping" Sound

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04-17-2014, 09:10 AM

John2001XJ

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Year: 2001

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Engine: 4.0

Quick Question - Mid to High RPM "Slapping" Sound

Ok, since I now have a good head on the Jeep, I've finally been able to use it as my daily driver.

I noticed what can best be described as a "slapping" sound when the engine gets to 2300/3000 rpm range before shifting to 2nd gear (and again when going to 3rd.) I haven't noticed it between any other gears. It is not present in lower rpm ranges.

It's definitely coming from the motor, so I am looking for thoughts on what I may want to look at it.

thanks, all!

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04-17-2014, 10:38 AM

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Year: 1996

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Engine: 4.Slow

Slapping or more of a knocking?

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04-17-2014, 02:13 PM

John2001XJ

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Year: 2001

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I would describe as a slap - it doesn't sound like anything I would consider a knock, and it only happens during higher rpms. I would think something like a knock could be heard regardless of engine speed.

It almost sounds as if the valves are slapping against the valve cover (but I know that is not the case, just trying to describe the sound).

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