Misfire in the #8 cylinder


Asked by Oct 27, 2013 at 12:29 PM about the 2006 Cadillac STS V8 RWD

Question type: Maintenance & Repair

I have a misfire in the #8 cylinder. I changed the sparkplugs and the ignition coil and I
have the misfire. I checked the compression in the cylinder and it is up to par.
Checked to
ensure that there is 12v going to the injector that's fine. I also have a code for the
converter. Two questions: Could the catalytic converter cause the misfire and if not,

3 Answers


No, but the catalytic converter probably failed because of the misfire. When an engine misfires raw fuel is dumped into the exhaust system. The raw fuel gets burned up in the hot catalytic converter and ruins the catalyst. Since everything on #8 checks out you most likely have a bad fuel injector on cylinder #8. It's most likely not spraying fuel. No fuel = misfire. HTH. -Jim

3 of 3 people found this helpful.

I have the same problem mis fire#8.switched coils still there. No other lights on. Do.

3 of 3 people found this helpful.

05 sts v8

1 of 1 people found this helpful.

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