Need Help With Sound

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05-21-2019, 10:41 PM

burkett.j

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Join Date: Sep 2013

Location: Boise, ID

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Year: 1999

Engine: 4.0L l6

Need Help With Sound

Hey guys, I have a '99 Xj that is making a sound when I idle. The sound is a sort of popping rattle coming from the lower portion of the engine (maybe rearward?). You can also feel it in the floorboard.

I want to mention that the exhaust pipe right after the manifold is crushed and restricting flow. I don't know if the back pressure would create this sound?

Any help would be appreciated!

P.s. Sorry for the poor quality video. The rattly Boise is what I'm hearing. I have my phone placed up against the transmission hump near the gas pedal.

https://youtu.be/juV8hP5wYmU

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05-22-2019, 05:57 AM

dave1123

Old fart with a wrench

Join Date: Nov 2010

Location: Manlius, east of Syracuse, NY

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Year: 2000 XJ Sport & WJ Laredo

Model: Grand Cherokee (WJ)

Engine: 4.0L

Check the flexplate for cracks near the hub or loose torque converter drive bolts.

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05-22-2019, 08:56 AM

jordan96xj

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Join Date: Dec 2015

Location: Syracuse, NY

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Year: 1996

Model: Cherokee (XJ)

Engine: 4.0L

Quote:

Originally Posted by burkett.j

I want to mention that the exhaust pipe right after the manifold is crushed and restricting flow. I don't know if the back pressure would create this sound?

Believe it or not, it came that way from the factory and is normal. It won't cause any problems.