2jdeemo

Hello gents don't post much but as of right now I'm completely stumped. My car has been running on 5 cylinders and cant figure out why. I figured out it was cylinder 3. So my next step was trying to figure out why. The coilpack has power going to it but I'm not sure where the other wire goes to. I'm assuming its a signal wire of some kind but where does it go? I tried using Google but I couldn't find a diagram that would be any help. any help would be greatly appreciated. I also have a map sensor problem but lets save that for another topic.