New Plugs New Bugs
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Newbie
Joined: Sep 2010
Posts: 9
Likes: 0
Model: Cherokee
New Plugs New Bugs
Greetings,
This is my first post but I have gained a wealth of information by searching here many times before--thanks to all for your generous sharing of invaluable contributions.
Here's the problem: I have a 1997 with a 4.0L which was running fine but I decided to change the wires and plugs as they had not been changed in 70000 miles. I changed the plugs, first with Autolite platinums then with Champions same type as the old plugs. Gapped .035. With new plugs, the Jeep idles and runs rough--seems like a CPM issue. Old plugs, runs fine. I didn't replace the cap or rotor. Would a hotter spark from the new plugs cause more efficent firing thus causing the CPM to regulate differently? Should I replace cap and rotor also? Thanks in advance for any help given!
This is my first post but I have gained a wealth of information by searching here many times before--thanks to all for your generous sharing of invaluable contributions.
Here's the problem: I have a 1997 with a 4.0L which was running fine but I decided to change the wires and plugs as they had not been changed in 70000 miles. I changed the plugs, first with Autolite platinums then with Champions same type as the old plugs. Gapped .035. With new plugs, the Jeep idles and runs rough--seems like a CPM issue. Old plugs, runs fine. I didn't replace the cap or rotor. Would a hotter spark from the new plugs cause more efficent firing thus causing the CPM to regulate differently? Should I replace cap and rotor also? Thanks in advance for any help given!
CF Veteran
Joined: Oct 2009
Posts: 5,390
Likes: 3
From: Chicago IL
Year: 1997
Model: Cherokee
Engine: 4.0 Straigh 6
Greetings,
This is my first post but I have gained a wealth of information by searching here many times before--thanks to all for your generous sharing of invaluable contributions.
Here's the problem: I have a 1997 with a 4.0L which was running fine but I decided to change the wires and plugs as they had not been changed in 70000 miles. I changed the plugs, first with Autolite platinums then with Champions same type as the old plugs. Gapped .035. With new plugs, the Jeep idles and runs rough--seems like a CPM issue. Old plugs, runs fine. I didn't replace the cap or rotor. Would a hotter spark from the new plugs cause more efficent firing thus causing the CPM to regulate differently? Should I replace cap and rotor also? Thanks in advance for any help given!
This is my first post but I have gained a wealth of information by searching here many times before--thanks to all for your generous sharing of invaluable contributions.
Here's the problem: I have a 1997 with a 4.0L which was running fine but I decided to change the wires and plugs as they had not been changed in 70000 miles. I changed the plugs, first with Autolite platinums then with Champions same type as the old plugs. Gapped .035. With new plugs, the Jeep idles and runs rough--seems like a CPM issue. Old plugs, runs fine. I didn't replace the cap or rotor. Would a hotter spark from the new plugs cause more efficent firing thus causing the CPM to regulate differently? Should I replace cap and rotor also? Thanks in advance for any help given!
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