Help with tracking down misfire
03-03-2004, 01:44 AM
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Help with tracking down misfire I recently bought a 98 Formula M6 with ~83k miles on it. Soon after I bough it the SES light started flashing. I plugged in my code scanner and it indicated a misifre on cylinder 5. The engine was completely stock when I bought it, including plugs and wires, so those were the first things I replaced. I put NGK TR-55s and MSD wires. Drove it around for a while after. Misfire still showed up. So I switched the coil between cylinder 1 and 5. It still misfired on cylinder 5. It only seems to happen after the car has warmed up for about half an hour, and I am cruising at 40+ mph. It has never happened under idle, low speed, or acceleration. It also doesn't feel any different when it happens. The only reason I can tell it's misfiring is because it's throwing the code. What else should I be checking to see what might be causing it?
03-03-2004, 08:48 AM
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Originally Posted by blademan83
I recently bought a 98 Formula M6 with ~83k miles on it. Soon after I bough it the SES light started flashing. I plugged in my code scanner and it indicated a misifre on cylinder 5. The engine was completely stock when I bought it, including plugs and wires, so those were the first things I replaced. I put NGK TR-55s and MSD wires. Drove it around for a while after. Misfire still showed up. So I switched the coil between cylinder 1 and 5. It still misfired on cylinder 5. It only seems to happen after the car has warmed up for about half an hour, and I am cruising at 40+ mph. It has never happened under idle, low speed, or acceleration. It also doesn't feel any different when it happens. The only reason I can tell it's misfiring is because it's throwing the code. What else should I be checking to see what might be causing it?
03-03-2004, 09:41 AM
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Originally Posted by blademan83
I recently bought a 98 Formula M6 with ~83k miles on it. Soon after I bough it the SES light started flashing. I plugged in my code scanner and it indicated a misifre on cylinder 5. The engine was completely stock when I bought it, including plugs and wires, so those were the first things I replaced. I put NGK TR-55s and MSD wires. Drove it around for a while after. Misfire still showed up. So I switched the coil between cylinder 1 and 5. It still misfired on cylinder 5. It only seems to happen after the car has warmed up for about half an hour, and I am cruising at 40+ mph. It has never happened under idle, low speed, or acceleration. It also doesn't feel any different when it happens. The only reason I can tell it's misfiring is because it's throwing the code. What else should I be checking to see what might be causing it?
