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Old 05-23-2012, 07:48 PM   #1
borntorun4's Avatar
Join Date: May 2012
Location: Denver
Posts: 10
Exclamation Backfiring Badly

Newbie to all of it...

I've owned my '98 TJ for about a year, approaching 140K miles. 4.0L, 5-Speed. Recently, she's begun to backfire on me regardless of the weather or length of time I've driven her.

The backfires almost exclusively occur when I engage the clutch to change gears and allow the RPMs to drop from about 3000 to 2000. It sounds like the backfire is coming from underneath or near the rear of the vehicle, but, since I'm deaf in one ear, I'm not completely certain.

I'd appreciate some ideas before I deal with my first mechanic. And if you know of a good Jeep mechanic in the DTC, that would be great, too.


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Old 05-24-2012, 09:04 AM   #2
jgorm's Avatar
Join Date: May 2010
Location: San Diego
Posts: 1,876
Backfires are almost always a timing issue. I'm not sure if the 98's have adjustable timing on the dizzy, but I would start there. If not then look at crank/cam sensors.

my 06 LJ rubicon
2.5" SL, 1" BL, DIY highline, 35s with double beadlocks.
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Old 05-24-2012, 11:36 AM   #3
borntorun4's Avatar
Join Date: May 2012
Location: Denver
Posts: 10
Thanks for that piece of information. I will begin there!
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