Question about 1997 Jeep Wrangler

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Lacks power in highway hills

Background: Bought this jeep it had a nuked engine. #1 Piston exploded, 10 qts of fluid...water and oil (guess he kept trying to keep the heat down). When I pulled the intake and exhaust manifold...oil ran out...So, oil in exhaust...looked like a fogger for about 30 min-1 hr when I first started the new engine. Replaced the head, block, exhaust man and intake manifold with a 2.5 L from a Jeep Cherokee. Runs pretty good as I have worked out a few bugs. When running down the highway at 55+ in 5th gear and hit a hill, the engine can't keep up the speed...not even down-shifting to 4th...it is pretty bad. I have checked the firing order and vac lines. Like I said, it runs great at lower speeds or on flat terrain.  Thanks

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  • isleys May 25, 2008

    Thanks. Actually mounted the Wrangler Flywheel on the cher engine. It was identical to the Wranglers. Thanks. I will check the gear ratio. Thanks.

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Hi,

I am assuming that you have no issues with the engine whatsoever, then the only possible areas to check would be:
1. axle gear ratio - to my knowledge a Wrangler would be 4.11 while some Cherokees could be anywhere from 3.54-4.88;
2. flywheel - a lighter flywheel could cause the engine to loose easily its momentum hence difficulty on an a rise.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on May 25, 2008

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