Crackling when engine is revved 2500-3000 rpms? -
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post #1 of 2 Old 03-05-2006, 11:57 PM Thread Starter
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1999 WJ 
Join Date: Jan 2005
Location: Sandpoint, Idaho
Posts: 265
Crackling when engine is revved 2500-3000 rpms?

When I rev my engine up to around 3000 rpms in neutral, I hear a very noticeable cracking/backfiring noise. This "crackling" occurs when the rpms have peaked and are dropping back down to idle.

What could this be? Is this normal?

It's just been bugging me for quite some time now.


2012 WK2 :: V6
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post #2 of 2 Old 03-06-2006, 05:53 AM
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1996 ZJ 
Join Date: Apr 2003
Location: Belle, WV
Posts: 4,930
It could be caused by just about anything.
Assuming the noise you describe has a combustion source, you may be hearing unburned fuel igniting as it is evacuated from the cylinders.
To help ensure your combustion system is working properly, clean the throttle body and combustion chamber, run some fuel injector cleaner through the tank, replace your O2 sensors, and do a compression test.
If the noise continues after that, check the timing to ensure your timing chain hasn't stretched too much.

Black 1996 5.2L ZJ Limited
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