95 yj 4.0L losing power - JeepForum.com
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post #1 of 4 Old 06-14-2013, 11:29 AM Thread Starter
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1995 YJ Wrangler 
Join Date: Aug 2010
Location: California
Posts: 2
95 yj 4.0L losing power

Ok so i am working with a 95 yj with the 4.0L high output. and it is really losing power. it seems fine if your just cruising at slow speeds but if you come to any size of a hill the power just drops. you need to have the petal to the floor just to maintain speed and even then you are not seeing anymore the 2000 rpm. so far we have replaced the air filter, the fuel filter, and all spark plugs. what could be the cause of this issue.

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post #2 of 4 Old 06-14-2013, 11:48 AM
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Location: corpus christi
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clogged exhaust?

I don't feel like working on anything at this time so i sold my yj.
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post #3 of 4 Old 06-14-2013, 02:22 PM
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1995 YJ Wrangler 
Join Date: May 2011
Location: Baltimore
Posts: 3,776
Were the diffs regeared for the 33's? If not that could explain it.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #4 of 4 Old 06-14-2013, 02:49 PM
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1991 YJ Wrangler 
Join Date: Apr 2008
Location: Meridian
Posts: 2,565
Has your rig run fine in the past and this issue is new and not related to any other mods? Sounds like a clogged catalytic or fuel delivery issue if this just showed up on it's own.
Check for codes, check fuel pressure at the fuel rail, and then thump the cat and listen for a rattle (when cold of course).
idaholtby is offline  

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