1998 Mustang GT, automatic, approx. 75k miles. Only modifications are 3.73’s, and a PI intake manifold. When I had the intake manifold put on I forgot to specify that I wanted copper plugs so the mechanic put on some platinum plugs with new wires, which was around 5,000 miles ago. Anyways, about 2 weeks ago during a very rainy day, my car threw the CEL. So I pulled over to the nearest AutoZone and had them pull the codes immediately. Cylinder 6 misfire. So I basically just said screw it until today, the only day I had time to look into possible solutions to the problem.
So today I went out to the car and pulled out the cylinder 6 spark plug and replaced with a new Autolite copper one to see if I could get it to fire correctly. Well, this didn’t correct any problems. So since the problem wasn’t with the spark plug I moved on. While the car was running (and missing…) I pulled the cylinder 6 ignition wire from the coil pack and saw no difference in the motor movement, as in no more shaking, nothing changed it was still missing although from the wire to the coil pack it was throwing a good spark (which knocked the **** out of me). So, I then decided to swap the wires from cylinder 6 and 5 to see if it was a bad ignition wire, tested this and the wire seems to be fine, when I used the cylinder 5 wire it still missed on cylinder 6. So it’s not the wire or the plugs as far as I can see. I was told if the problem with coil pack related I would have multiple misfires, but this isn’t the case, so is it possible to have a bad coil pack causing the problem with only a single cylinder misfiring?
If it isn’t the coil pack (haven’t tested it), and it isn’t the wire or plug, what it the problem? Possibly fuel related.
Basically where do I go from here…? Anyt help, thanks.
So today I went out to the car and pulled out the cylinder 6 spark plug and replaced with a new Autolite copper one to see if I could get it to fire correctly. Well, this didn’t correct any problems. So since the problem wasn’t with the spark plug I moved on. While the car was running (and missing…) I pulled the cylinder 6 ignition wire from the coil pack and saw no difference in the motor movement, as in no more shaking, nothing changed it was still missing although from the wire to the coil pack it was throwing a good spark (which knocked the **** out of me). So, I then decided to swap the wires from cylinder 6 and 5 to see if it was a bad ignition wire, tested this and the wire seems to be fine, when I used the cylinder 5 wire it still missed on cylinder 6. So it’s not the wire or the plugs as far as I can see. I was told if the problem with coil pack related I would have multiple misfires, but this isn’t the case, so is it possible to have a bad coil pack causing the problem with only a single cylinder misfiring?
If it isn’t the coil pack (haven’t tested it), and it isn’t the wire or plug, what it the problem? Possibly fuel related.
Basically where do I go from here…? Anyt help, thanks.