frazierfreud Posted January 19, 2014 Report Share Posted January 19, 2014 Well I thought I fixed the misfire issue when I changed the plugs after finding the #8 plug electrode bent to the point of not having a gap anymore. Well, within minutes of starting a hot lap the same issue began happening. Engine missing and erratic power. I pitted and heard a tapping sound out of the engine on the driver side (just as before when I had the #8 plug issue). I pulled the #6-8 plugs and they looked fine. I did notice that when pressing the coils on the driver side, they were all firmly seated, except on cylinder 8. I could push it down 1/4" and it would push back. I looked at the end of the boot and the spring seemed a little further out compared to the other boots. I then started the car and it sounded smooth again. I took it out in the next session and same issue started again. However, the engine ran smoothly upon pitting. But, had engine code cylinder 7 misfire. I left and went home. Drove smoothly even when getting on it. At this point, I was disgusted messing with it. Took out the race pads up front and back in with the hawks and street tire/ wheel setup. Bedded in brakes and all was smith as can be with repeated boost including some third gear pulls. Thought maybe I would change the #7 coil. A few weeks ago it was cylinder 3 misfire, then cylinder 8 misfire (understandable with bent plug), and now cylinder 7. I'm not sure what to do at this point. On a lighter note, I put the race pads and Nitto nt01 on the wife's otherwise stock Boss 302 and drove it to the track today. I shaved 2 seconds off my best time in my gt500 after my second session! Feels much lighter on its feet. More balanced. Not as stiff as my gt500 ( more roll in boss). Ass end wants to come out a little more easily. Shifter sucks in the boss. Overall smoother car though. Link to comment Share on other sites More sharing options...
Kevin Patten Posted January 20, 2014 Report Share Posted January 20, 2014 JMO - like I said before - you might have a cat breaking down/apart or an electrical problem . I would suggest dropping the cats and check them to see if they are still solid peices. I refer to this because something had to close that gap on the #8 plug so if for not anything else at least you check to make sure your not getting chunks of the cat material getting into the motor (I've seen this on a car-passenger side was in pieces while drivers side was solid) . It's the only thing that I'd suggest at this time as a starting point. Link to comment Share on other sites More sharing options...
frazierfreud Posted January 20, 2014 Author Report Share Posted January 20, 2014 I'll check the cats out. Thanks Link to comment Share on other sites More sharing options...
headliner53 Posted April 8, 2014 Report Share Posted April 8, 2014 Install new plugs. Stop using fuel additives. Just Name brand high octane fuel. Quality octane booster, depending on your tune. Link to comment Share on other sites More sharing options...
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