Hi,
I have a 1991 Jeep Cherokee with 4.0L straight six engine. I am using Autolite Platinum plugs and when I changed them recently I noticed soot on the plug rim. Also the exhaust pipe shows soot. Any idea what would cause this?
Hi,
I have a 1991 Jeep Cherokee with 4.0L straight six engine. I am using Autolite Platinum plugs and when I changed them recently I noticed soot on the plug rim. Also the exhaust pipe shows soot. Any idea what would cause this?