Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, misfire on #1 in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; I just changed all the coil packs (I've gotten codes on 2 of them in the past and now a ...
I just changed all the coil packs (I've gotten codes on 2 of them in the past and now a misfire on #1, I got a deal for all 6 so I changed them all) and was going to replace the plugs but I was mailed the wrong ones. So I WILL be changing the plugs. I did re-gap the ones that were in there.
But anyway, what else could cause a misfire?
It seems to be running fine. My code reader says it's resetting the code, but as soon as I start the car the engine light is on and stays on. Prior to changing the coil packs we would get a brief flashing engine light (not even a minute) and then it would turn off all together. This would be right after a hard start or running a little rough, but then it smooths out and runs fine for a few days before it starts up again.
I thought maybe one of the new coil packs was bad so I swapped in the one that the dealer changed last year. Still getting a misfire on #1 (That's the front passenger side BTW)