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Old 08-18-2009, 12:31 AM   #1
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Get up and go issue....help???

I have a 4X4 2006 Jeep Wrangler 4.0. I have done a complete tuneup and have developed this issue with power loss now. I have changed the spark plugs twice (once Autolite and then went back to NGK) thinking that was the problem but it didn't fix it. The Jeep has power to accelerate but when I hit about 45MHP the engine bogs down and acts like it doesn't want to go. If you press the gas and accelerate it gains back the power but it feels like it comes out of overdrive to do it. Could it be a transmission issue (overdrive) or something else...I am clueless...HELP??

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Old 08-18-2009, 01:33 AM   #2
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having power to 45 means your motor is fine. sounds like transmission issues. how many miles and when was the last time it was serviced? how is the tranny shifting?

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Old 08-18-2009, 11:29 AM   #3
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We just bought the Jeep in May of this year with 35,000 miles on it so it has never been serviced since we have had it. Come to think of it, it is shifting kinda hard and hesitant, especially when I put it in drive from park....hmmm?? Thanks for the info, we have an extended warranty so I will definitely have that checked out!!
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Old 08-18-2009, 11:57 AM   #4
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Have the catalytic converter checked for excessive back pressure too. When they break up inside, the ceramic pieces can clog it up enough so the engine can barely run. Any muffler shop can perform easily/inexpensively a pressure check on it in just a few minutes.
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Old 08-18-2009, 12:34 PM   #5
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Thanks Jerry...will do! I didn't think of that but makes sense!! That's why I love this forum...great info!
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Old 08-18-2009, 12:37 PM   #6
Really?

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Sorry for the hijack! Yeah, like Jerry said, have the converter checked out.
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Old 08-18-2009, 12:43 PM   #7
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I have the 06, 4.0, I-6, auto Unlimited and have noticed the same thing. Mine has an overdrive off switch. If I am driving around town, I just switch the overdrive off and don't have any problems at all. After driving standards for so long, to me it feels like it shifts into overdrive at too low an rpm. If you use that switch and turn it off in city driving you shouldn't have that problem. Just switch it back on when on the highway or are sustaining high speeds. Might not be the answer that you are looking for, but it works for me.

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