Help! Intermittent Misfire above 2000 RPM
#1
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Year: 1991
Model: Cherokee (XJ)
Engine: 4.0
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Hi everyone! I'm at the tail end of the engine rebuild process with the 4.0 back in my 91 jeep cherokee XJ and I've run into a bit of a misfire problem. I managed to break the cam in, but not without an intermittent misfire above 2000 rpm. It idles fine without any misfires and has good oil pressure but as soon as i rev it, it starts to misfire. I've been battling it since, just trying to get it running right. I've replaced the ignition coil and CPS and looked at the forums to see if I could find my same problem, but I just haven't quite found the solution. Any help would be greatly appreciated. I've included a video as reference. Thanks!
Last edited by Cheap Jerokee; 10-03-2023 at 11:33 PM.
#4
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Are you sure it's a mis? Doesn't sound like a misfire, which would be more of an irregular rpm
Yours seems to be more than that, almost like an intermittent brief loss or reduction of power.
Yours seems to be more than that, almost like an intermittent brief loss or reduction of power.
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