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Unread 04-28-2011, 02:15 PM   #1
KENNYB91YJ
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1991 YJ Wrangler 
 
Join Date: Apr 2011
Location: Martinsville, Indiana
Posts: 59
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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Unread 04-28-2011, 04:10 PM   #2
Buddha
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1993 YJ Wrangler 
 
Join Date: Mar 2011
Location: Austin, AR
Posts: 191
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.
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Unread 04-28-2011, 04:55 PM   #3
KENNYB91YJ
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1991 YJ Wrangler 
 
Join Date: Apr 2011
Location: Martinsville, Indiana
Posts: 59
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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Unread 04-28-2011, 06:19 PM   #4
5cents
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2008 JK Wrangler 
 
Join Date: Oct 2008
Location: robinson, il
Posts: 359
You might ask over here. http://www.jeepforum.com/forum/f12/ The YJ guys talk tech there.
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Unread 04-28-2011, 09:29 PM   #5
KENNYB91YJ
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1991 YJ Wrangler 
 
Join Date: Apr 2011
Location: Martinsville, Indiana
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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