That is a wiring order. Your firing order will be something like this - 1, 3, 7, 2, 6, 5, 8. (Give me the make, model, year and engine size of your car and I will let you know what it is). If all the wires are in the correct places as indicated on the coil pack then that is the best you can do really since the computer controls the firing order. You can loosen all of the connectors at the coil packs and one by one remove them and see if the engine shudders. Use insulated pliers or rubber gloves so you don't get shocked. If you come across one that makes no effect then that cylinder is a potential problem. You can get an OBD II code reader to do this for you as well. If the blue one does not have a metal contact that is your problem and you need to find out whether the contact is supposed to be a part of your coil or spark plug wire. My guess is the one missing the terminal connector is causing the engine to misfire. If you could pull back the rubber boot and take a good picture of that wire.
Tuesday, June 17th, 2008 AT 10:33 PM