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Unread 02-23-2013, 06:52 PM   #1
xjberto
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Join Date: Feb 2013
Location: Maywood, nj
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diagnose my backfiring

Hello guys. Im new here and pretty new to jeeps in general. I recently picked up a 98 xj with 166k miles. When I first got it it would do the studdering acceleration and backfire. I did a tune up (oil change, air filter, spark plugs, distributor cap and rotor) also changed the tps and the car was running nice and smooth.

Now im starting to get the studdering backfire problems again. Some other issues I noticed that might help narrow this down are two check engine codes. One for evap system and the other for fuel sending unit. Another thing I noticed is when I cold start the car it idles low like the car has been warmed up already.

Any advice is appreciated

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Unread 02-23-2013, 07:03 PM   #2
CJ7-Tim
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Fix the issues shown by the Check Engine Light trouble codes.

Bucking, stalling, or backfiring is usually caused by O2 sensor issues. O2 sensor life is about 100-150,000 miles. You can test the O2 sensors, but one might correctly assume that they are overdue for changing.
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Unread 02-27-2013, 11:23 AM   #3
xjberto
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Can a faulty alternator cause these issues?
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Unread 02-27-2013, 11:28 AM   #4
CJ7-Tim
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Yes. The Jeep ECU and sensors are very sensitive to voltage problems, and poor quality ground connections.
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Unread 02-27-2013, 07:15 PM   #5
xjberto
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I think thats my issues. I did get an o2 sensor that I can hopefully get in tomorrow. Seems to be getting worse. Today as I was driving I was getting a lot of popping sounds from the exhaust manifold. Also while accelerating it would stop accelerating and the rpms would drop and then it would surge back up. Two times today while on the brakes to slow down the car completely shut off. Im getting some squeeky sounds from the alternator area. The sound comes and goes.
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Unread 02-28-2013, 09:26 PM   #6
xjberto
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Finally got my o2 sensor swapped out. Also went ahead and cleaned my throttle body, it had a lot of carbon build up inside. And I cleaned up some of the grounds. The jeep is running so much smoother. Thanks Tim.

Now I can focus on getting lifted.
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