Misfire

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Aug 8, 2013 | 01:00 PM

xjcruiser1664

Thread Starter

Newbie

Joined: Apr 2012

Posts: 23

Likes: 0

Model: Cherokee

Engine: 4.0

Misfire

Hey my friend changed his valve cover gasket and now his jeep runs terrible ran perfect before do you know what could have happened

Aug 8, 2013 | 03:33 PM

Muaddib420

Seasoned Member

Joined: Jun 2012

Posts: 485

Likes: 3

Model: Cherokee

Something wasn't plugged back in probably. Rear PCV valve into throttle body possibly? Or the ground that goes to the rear driver side valve cover bolt.

Aug 8, 2013 | 05:02 PM

belvedere

CF Veteran

Joined: Jul 2012

Posts: 1,395

Likes: 1

From: SD

Year: 1998

Model: Cherokee

Engine: 4.0

Maybe a plug wire got bumped.

Aug 8, 2013 | 10:00 PM

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,578

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by xjcruiser1664

Hey my friend changed his valve cover gasket and now his jeep runs terrible ran perfect before do you know what could have happened

Does anyone besides your friend know the year, engine size etc of said Jeep?

Aug 9, 2013 | 12:57 AM

xjcruiser1664

Thread Starter

Newbie

Joined: Apr 2012

Posts: 23

Likes: 0

Model: Cherokee

Engine: 4.0

91 cherokee 4.0

Aug 9, 2013 | 12:59 AM

xjcruiser1664

Thread Starter

Newbie

Joined: Apr 2012

Posts: 23

Likes: 0

Model: Cherokee

Engine: 4.0

We checked all the wires the PVC valve egr valve all working right and on right

Aug 9, 2013 | 01:08 AM

OleBlue

CF Veteran

Joined: Oct 2011

Posts: 1,339

Likes: 0

From: Yakima

Year: 1990

Model: Cherokee

Engine: 4.0 I6

Howd u check the egr valve on a 91 with no egr valve. lol

Check the vac hose to the map sensor, could have gotten pulled off when trying to get to rear most bolts of the valve cover. The map sensor is on the firewall kind of behind the valve cover.