Cherokee Misfire
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Joined: Aug 2009
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Model: Cherokee
Cherokee Misfire
My 1999 6 Cyl. Jeep Cherokee is missing on Cyl 2. I have replaced the Plugs, Plug caps and no change. I replaced the coil bar and then it would not start at all. I bought another Coil bar and tried it. It still wouldn't start. I put the old one back on and it started but is still missing. The code is P0302 showing misfire in cly 2. I’ve replaced the fuel injector for #2 and it made no difference. I pulled the spark plug for #2 and it looked like a brand new one out of the box. Does anyone know what’s going on or can guide me?
CF Veteran
Joined: Feb 2009
Posts: 2,203
Likes: 3
From: Houston Tx.
Year: 1995
Model: Cherokee
Engine: 4.0
P200 series codes cover injectors, since you have a P300 series, it's not the injector.
P300 points to something that upsets the engine's air/fuel mixture such as a EGR valvle or vacuum leak
or low fuel pressure (weak pump or faulty pressure regulator).
Check all your vacuum lines, then check your fuel pressure, the vid in the link shows how.
http://www.2carpros.com/how_to/how_t...l_pressure.htm
P300 points to something that upsets the engine's air/fuel mixture such as a EGR valvle or vacuum leak
or low fuel pressure (weak pump or faulty pressure regulator).
Check all your vacuum lines, then check your fuel pressure, the vid in the link shows how.
http://www.2carpros.com/how_to/how_t...l_pressure.htm
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