96 vs 98 idle Smoothness
CF Veteran
Joined: Jan 2010
Posts: 1,456
Likes: 74
From: North Riding of Yorkshire, UK
Year: 1997
Model: Cherokee
Engine: 4.0
Anything is possible from a plug wire shorting up to lack of compression in one cylinder.
I'd start with disconnecting one spark plug wire at a time and see if one of them doesn't make a difference.
You might be able to isolate the fault to one cylinder, or you might have a problem that affects the whole engine like a vacuum leak or a dirty IAC.
I'd start with disconnecting one spark plug wire at a time and see if one of them doesn't make a difference.
You might be able to isolate the fault to one cylinder, or you might have a problem that affects the whole engine like a vacuum leak or a dirty IAC.
Thread Starter
Seasoned Member
Joined: Jul 2018
Posts: 419
Likes: 59
Model: Cherokee (XJ)
The IAC, front O2, plugs and wires are 1 year old. The stumble I'm experiencing isn't the dramatic misfire a bad plug would cause. I'm trying to get the 98 to idle as smoothly as the 96, which might be impossible.
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