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Unread 06-14-2013, 11:29 AM   #1
Devo04
Registered User
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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Unread 06-14-2013, 11:48 AM   #2
superj
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1987 YJ Wrangler 
 
Join Date: Mar 2008
Location: corpus christi, texas
Posts: 6,498
clogged exhaust?
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Slow ride, take it easy
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Unread 06-14-2013, 02:22 PM   #3
Siva283
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1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters, WV
Posts: 3,698
Were the diffs regeared for the 33's? If not that could explain it.
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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.

[QUOTE=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]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...[/QUOTE]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
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Unread 06-14-2013, 02:49 PM   #4
idaholtby
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1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian, Idaho
Posts: 2,554
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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