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Old 04-10-2011, 09:05 PM   #1
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loss of power

Please help! I have a 4.0 with a automatic I am having problems with loss of power and bad miles per gal went from 15 to 12. I have changed spark plugs I went to the E3's helped for a little bit but back to the same. any help on this would be great I'm at a loss
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Old 04-10-2011, 09:22 PM   #2
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have u added larger tires recently without regearing? thats all i can think of :/

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Old 04-10-2011, 09:44 PM   #3
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What year? How many miles?
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Old 04-10-2011, 09:47 PM   #4
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Get rid of the E3's for a start. There are bunches of threads here that dicusses their weaknesses. What year jeep do you have? After 99 they went to a distributorless system so your needs depend on year model. Search the threads for power loss or spark plugs and you'll get a lot of info. Let us know.
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Old 04-10-2011, 10:19 PM   #5
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With this being such a sudden change ide put money of a sensor especially and O2 sensor going bad.
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Old 04-10-2011, 10:46 PM   #7
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Yeah, I'd be leaning toward a lazy O2 sensor that just hasn't gone out completely (thus not throwing a code)
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Old 04-10-2011, 10:56 PM   #8
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It's a 2005 with 84000 on it.
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Old 04-10-2011, 11:00 PM   #9
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Before I put the E3 spark plugs in I had one cylinder that the gap would increase on its own I was hoping the E3's were a easy fix for that
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Old 04-10-2011, 11:05 PM   #10
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Without much info, I'd say swap ur coil pack for a known good one. Also, stick with the OE Champion spark plugs and watch out for snake oil in a can.
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Old 04-25-2011, 11:45 PM   #11
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So I put the or plugs back in and gained some of my power back and fuel mileage back also thanks for the help everone

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