89 Wrangler 2.5l backfiring after it gets warm - JeepForum.com
 
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post #1 of 4 Old 09-20-2017, 02:01 PM Thread Starter
Madatjeep
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I need help! I have a 89 wrangler 2.5l 44 that will start backfiring after it gets warm. It also loses fire. I've replaced spark plugs, wires, ignition coil, ignition control module, crank sensor, dist cap, rotary button & had the ecm rebuilt.


Last edited by Madatjeep; 09-21-2017 at 01:44 PM.
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post #2 of 4 Old 09-20-2017, 02:34 PM
mike134
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Location: Cleveland
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Is it actually backfiring through the intake? Or is just a popping sound from the exhaust?

If popping from the exhaust, the first thing to do is check the exhaust manifold bolts. Take special care to tighten the ones in the very far back of the engine compartment at least once per year. After that, look for leaks in the rest of the exhaust pipe.


Pull your engine codes, you may be running rich for some reason.

If it is actually backfiring through the intake, then the jeep should be running really poorly and your timing is off. Most likely due to a timing chain that has stretched and skipped a tooth or two.
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post #3 of 4 Old 09-21-2017, 08:45 AM Thread Starter
Madatjeep
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It's backfiring through the exhaust. But it is also losing firing.

Last edited by Madatjeep; 09-21-2017 at 01:42 PM.
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post #4 of 4 Old 09-22-2017, 10:36 AM
mike134
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Sorry, I missed a couple things in your original post. There are no codes available on the 89.Also, the popping makes sense if you don't ignite the gasoline in the cylinders, all of that fuel goes into the exhaust and combusts on the catalytic converter instead.

Another thing I would try is cleaning up the battery terminals and the ground connection to the engine block. Maybe even consider changing the 29 year old main battery cables. Since you've already done a tune up, the only thing I can think of is that it is not getting enough voltage for a proper spark.

Also, did you use copper spark plugs? The jeep doesn't like irridium or platinum.
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