I just started getting some misfires over the weekend, and a bunch, like 255/cycle showing on my interceptor. Misfires are on cyl 1 and 2 both. I switched the coils to a different set I had, same, then switched 1 and 4, same, then added in a different plug in cyl 1, same results. I then pulled a coil off on 1 then 2 and grounded it and ran the engine briefly. Spark looked good and consistent and engine did sound different when I unplugged it. , and I compared it to cyl 4 and they looked the same. I just changed the clutch ten days ago, so I am thinking perhaps a wire got chaffed. I cant think of what would effect just two cylinders though. I guess I will next start looking for chaffed wires. Any ideas would be appreciated.

 

Following just for updates. Only thing i could think is injector seals but the other two cylinders should join in

 

I thought of that as well. I cant hear it, but I haven't been driving spirited at all either due to clutch break in. Might do some new seals and a quick valve clean, if nothing else then to rule that out. Couldn't hurt.

 

What you are thinking about doing sounds good.

 

Stock flywheel or aluminum?

 

It is aluminum, its what comes with the Spec kit from OTTP. I thought of this too, its an F40, so the flywheel isnt a whole lot lighter then a stock F35 steel flywheel. Also I have used the chromoly flywheel from ACT before on the F35, and it weighed about ten pounds, never had any misfire issues with that. I do have some new Opels on order from Mongo and I will clean my valves while I am in there. It will also rule out a bit of wire and connections I would of had to trace, so although it may be just throwing parts at it, it seems a logical step at this point.