cherokee running rough/misfire.help!!!

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Oct 21, 2011 | 06:48 PM

#16

96whitexj

Thread Starter

Newbie

Joined: Feb 2011

Posts: 12

Likes: 0

From: vernon ct

Year: 1996

Model: Cherokee

Engine: 4.0

anybody have any suggestions to this i still cant figure it out im leaning towards fuel pump but i dont wanna buy one for nothing

Oct 21, 2011 | 07:29 PM

#17

tjwalker

CF Veteran

Joined: Nov 2010

Posts: 5,840

Likes: 117

From: In the middle of Minnesota!

Year: 1999

Model: Cherokee

Engine: 4.0

If the spec for your 96 is 49 psi and you have 35, you have a fuel delivery problem.

Feb 12, 2012 | 12:13 PM

#18

michaelbgone

Newbie

Joined: Nov 2011

Posts: 11

Likes: 0

From: Powhatan, Va.

Year: 1996

Model: Cherokee

Engine: 4.0L

Did you ever find the source of your problem. I'm very curious because as of today I have a similar issue with my 96. PO171 code, rough run at idle and steady state, still peppy when I put my foot in it. Tune-up 10k ago, visual check is good. O2's less than 10k miles. I have no idea what my FP is.

Feb 16, 2012 | 10:43 PM

#19

96whitexj

Thread Starter

Newbie

Joined: Feb 2011

Posts: 12

Likes: 0

From: vernon ct

Year: 1996

Model: Cherokee

Engine: 4.0

fuel pump

Feb 17, 2012 | 07:45 AM

#20

michaelbgone

Newbie

Joined: Nov 2011

Posts: 11

Likes: 0

From: Powhatan, Va.

Year: 1996

Model: Cherokee

Engine: 4.0L

Thank you

Feb 17, 2012 | 08:40 AM

#21

michaelbgone

Newbie

Joined: Nov 2011

Posts: 11

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From: Powhatan, Va.

Year: 1996

Model: Cherokee

Engine: 4.0L

Quote:

Originally Posted by 96whitexj

i dont even know where my regulator is on this thing. i seen people say they are right on the fuel rail but not on mine. is it on the pump in the tank or something or does mine not even have one. maybe i do have a fuel pump issue because also when i nail the thing goin down the road its like sluggish at wide open then if you back off the gas a hair it gains a lot more power

The pump/regulator is in the tank. The Haynes manual agrees, 46-51 psi at idle. I'm having a problem with my 96 also, so if I get time today I will be checking my FP and will then have first hand/recent hands on knowledge to possibly help you further.