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XJ Ask the Question Thread
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
Joined: May 2008
Posts: 15,016
Likes: 11
From: +34° 25' 35.67", -81° 21' 12.04"
Year: 1993
Engine: 4.0
CF Veteran
Joined: Sep 2012
Posts: 1,289
Likes: 0
From: Springfield Virginia
Year: 1998
Model: Cherokee
Engine: 4.0




