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post #1 of 5 Old 04-28-2011, 01:15 PM Thread Starter
KENNYB91YJ
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1991 YJ Wrangler 
 
Join Date: Apr 2011
Location: Martinsville
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91 Yj

Does anybody know why I lose ten mph when going up hill on the highway? It can be a very small incline and I still lose that much. Any suggestions on what I can do to fix it. Thanks

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post #2 of 5 Old 04-28-2011, 03:10 PM
Buddha
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1993 YJ Wrangler 
 
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Location: Austin
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Quote:
Originally Posted by KENNYB91YJ View Post
Does anybody know why I lose ten mph when going up hill on the highway? It can be a very small incline and I still lose that much. Any suggestions on what I can do to fix it. Thanks
Folks are probably going to need more info about your Jeep and the situation for you to get a good answer. Did this just start or is it something it has always done?

Prevailing wisdom from other posts I've read on here related to this problem seems to be that this is either a poorly tuned engine (plugs, wires, etc.), dirty/clogged fuel system, or the result of putting bigger tires on without re-gearing.

My 93 YJ 4.0 does the same thing, and I'm pretty sure it's the tire/gearing issue so I'm just living with it for the time being.

I have read hundreds, if not thousands, of threads on here and it's amazing the percentage of problems that wind up being caused by something the owner has accidentally done to the Jeep while working on it.

Moral to the story: If you moved it, unscrewed it, unbolted it, hammered on it, wiped it off, re-wired or replaced it - Check there first!
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post #3 of 5 Old 04-28-2011, 03:55 PM Thread Starter
KENNYB91YJ
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1991 YJ Wrangler 
 
Join Date: Apr 2011
Location: Martinsville
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Yea that's what I was thinking too. I do have 31/10.50s and I have no clue on what my gears are. This is my first jeep ever. Thanks for the advice.
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post #4 of 5 Old 04-28-2011, 05:19 PM
5cents
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You might ask over here. http://www.jeepforum.com/forum/f12/ The YJ guys talk tech there.
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post #5 of 5 Old 04-28-2011, 08:29 PM Thread Starter
KENNYB91YJ
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1991 YJ Wrangler 
 
Join Date: Apr 2011
Location: Martinsville
Posts: 59
Thanks for the site it has helped. I'm going to try some things tomorrow that they have said to do. Thanks again.
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