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XJ Ask the Question Thread
CF Veteran
Join Date: Aug 2012
Location: Bentonville, AR
Posts: 1,281
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Year: 1990
Model: Cherokee
Engine: I6 4.0
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,971
Received 1,550 Likes
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
CF Veteran
Join Date: Aug 2012
Location: ks
Posts: 1,539
Likes: 0
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Year: 1998
Model: Cherokee
Engine: 4.0
Seasoned Member
Join Date: Jun 2012
Location: Hartland Michigan
Posts: 261
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Year: 1999
Model: Cherokee
Engine: 4.0L I6
I own a 1997 Jeep grand Cherokee with a 4.0 L and at random times it will go down to about 250 rpms, just enough to still have power steering and then it will come back to normal rpms and it will back fire and blow of the muffler completely. I have replaced the pickup and the crankshaft positioner. I've checked the fuel pressure at the fuel rail and it is 46 psi. Anyone have any idea what might be wrong?
Junior Member
CF Veteran
Join Date: Sep 2012
Location: Springfield Virginia
Posts: 1,289
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Year: 1998
Model: Cherokee
Engine: 4.0