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husker boxster · 05-20-2020, 08:58 AM

Pull the #4 plug and check its condition. If it's fouled, clean it up and replace. Swap the coil to another cyl. Clear the codes. Start it up and see if the misfire is still there. Check the codes. If the misfire code has moved to the cyl with the #4 coil now on it, you've got a coil issue. If the misfire is still on cyl #4, you've got either a bad plug or bigger issues.

05-20-2020, 08:58 AM	#3
husker boxster Registered User Join Date: Sep 2006 Location: Omaha Posts: 2,866	Pull the #4 plug and check its condition. If it's fouled, clean it up and replace. Swap the coil to another cyl. Clear the codes. Start it up and see if the misfire is still there. Check the codes. If the misfire code has moved to the cyl with the #4 coil now on it, you've got a coil issue. If the misfire is still on cyl #4, you've got either a bad plug or bigger issues. __________________ GPRPCA Chief Driving Instructor 2008 Boxster S Limited Edition #005 2008 Cayman S Sport - Signal Green 1989 928 S4 5 spd - black 1987 928 S4 - Granite Green Metallic (Felsengrun)