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
Devo04
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1995 YJ Wrangler 
 
Join Date: Aug 2010
Location: California
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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
superj
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Join Date: Mar 2008
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
Siva283
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1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters
Posts: 3,750
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.

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diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

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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
idaholtby
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1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian
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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).
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