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Old 07-07-2013, 02:31 PM   #1
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jeep losing power and backfiring intake side

jeep starts fine drive for about 5 min and loses power and starts to back fire thru intake for about 1 min and then run ok , some time it will idle a little rough but will not stall and then starts idling ok again have check fuel pump 32pound and 39 pounds with vacum line unhooked replace about a year ago replace cat and muffler about 3 week ago o-2 4 week ago and water temp this week I first thought I had water in gas have added additive to fuel running out of idea any idea would help thanks

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Old 07-07-2013, 02:44 PM   #2
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Year and engine?

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Old 07-07-2013, 08:05 PM   #3
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1991 2.5 4cyl
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Old 07-07-2013, 08:20 PM   #4
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Have you pulled the codes to see what it's throwing? Is the Check Engine light on?
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Old 07-07-2013, 09:34 PM   #5
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crank position sensor
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...huh?...
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Old 07-07-2013, 10:26 PM   #6
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Quote:
Originally Posted by jfbilbro View Post
crank position sensor
I would think this would make it not start. He is having trouble with it running with loss of power.
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Old 07-07-2013, 10:44 PM   #7
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code 12,33,52,55 code 33 ac relay no ac code 52 rich ,
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Old 07-07-2013, 10:46 PM   #8
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Fuel pump? Something to do with fuel delivery would be my guess
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Old 07-07-2013, 10:57 PM   #9
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Could be a couple things. I would start with the heap stuff. Clean all contacts and rotor on he distributor cap. Also pull all your plugs and make sure they have strong spark and are free of debris. Then if you still have the problem with the 52 code try replacing your O2 sensor it may be throwing your ECM for a loop while its running.

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