post #1 of Old 05-29-2009, 07:24 PM Thread Starter
Bojeepus
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1995 YJ Wrangler 
 
Join Date: Jan 2009
Location: Chattanooga Tn
Posts: 495
Help needed 2.5L stumbling and back fireing with surging, INTERMITTENT PROBLEM

OK I have a problem but I have no clue were to start, its one of those intermittent problem, sensor maybe?? Any way its a 2.5L 1995 190,00 miles, as IM driving it will start surging and then stumbling and backfiring over and over, I can throttle through it but as soon as I let off it starts again, and then after I stop and start going again, it may not do it, could it be the fuel filter, fuel pump, sensor, I just did a tune up a few months ago and I have only put a few thousand on it and yes I used quality parts, IM just not sure were to start or what it could be any ideas on were to start and what it could be would be greatly appreciated and again its a problem that comes and goes

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post #2 of Old 05-29-2009, 08:02 PM
Carolinarednek
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1978 CJ7 
 
Join Date: Apr 2009
Location: Liberty SC
Posts: 100
Mine was doing the same thing. I dropped the fuel tank and cleaned it out and replaced the fuel pump sock. Hasn't acted up since. That was 3 weeks ago.

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post #3 of Old 05-29-2009, 09:02 PM Thread Starter
Bojeepus
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thanks i was thinking fuel pump or stoped up fuel filter but wasn't sure as it was comeing and going
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post #4 of Old 05-30-2009, 04:45 AM
rykerjenbob
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1995 YJ Wrangler 
 
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Location: maine
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How about the catalytic converter?
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post #5 of Old 05-31-2009, 08:21 AM Thread Starter
Bojeepus
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1995 YJ Wrangler 
 
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the cats in good shape i replaced that not so long ago when the factory one blew apart
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post #6 of Old 05-31-2009, 05:30 PM
Bigboyky
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1995 YJ Wrangler 
 
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Location: Northern Kentucky
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Mine did that but only when raining ir water on the road. Ended up being the O2 sensor. My son's was doing it all the time after warmed up.... That was the fuel line, where it goes from steel to rubber. The rubber was rotten and soft. Hope this helps some.

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post #7 of Old 05-31-2009, 08:11 PM Thread Starter
Bojeepus
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1995 YJ Wrangler 
 
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thanks i'll keep that in mind
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post #8 of Old 06-02-2009, 01:22 PM Thread Starter
Bojeepus
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1995 YJ Wrangler 
 
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ok i droped the tank and after i the sending unit/fuel pump, i found metal shavings under it, so i guess its the pump for sure
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post #9 of Old 06-15-2009, 11:01 PM Thread Starter
Bojeepus
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1995 YJ Wrangler 
 
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Location: Chattanooga Tn
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so now that i got every thing back in and have been running around for 2 weeks all is well it was the fuel pump, my jeep seems to be running better all the way around thanks for the help
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post #10 of Old 06-16-2009, 04:27 AM
YJInterceptor
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1996 ZJ 
 
Join Date: Apr 2009
Location: Charlotte nc
Posts: 125
I just replaced my fuel pump and fuel pressure reg as well, and I can't help but keep thinking that it feels differently for some reason. Felt like it had more power before the swap, well, before the death of the old pump anyway. I think its just me though, or that hole in the muffler that I found.
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post #11 of Old 06-17-2009, 08:08 PM Thread Starter
Bojeepus
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Location: Chattanooga Tn
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ya im feeling the same way now thats its done ive cherped the the 33s a few times
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