Running lean
CF Veteran
Joined: Feb 2010
Posts: 12,367
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From: Oroville, CA
Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
Just drive it. If it's running good and there is no check engine light, leave it alone. The ECM adjusts the air/fuel mixture, there is nothing you can adjust to richen it up.
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Model: Cherokee
CF Veteran
Joined: Feb 2010
Posts: 12,367
Likes: 23
From: Oroville, CA
Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
The only thing that you can do is make sure the MAP sensor is functioning, the O2 sensor is sweeping up and down, and the TPS is working. Those three sensors are the ones that dictate the fuel strategy the most.
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Member
Joined: Jan 2013
Posts: 146
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From: Edmonton,Canada
Model: Cherokee
Engine: 4.0 H.O
Post a picture of the plug. White on the tip is fine, it's when the ring at the top of the threads (flat surface) or down the walls of where the porcelain is white it is lean. Or if it's melting
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