2012 Mustang GT Misfire
- Thread starter 2012GTCS
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When you say that you checked the coils, what does that mean exactly?
How about the plug wires? Have you opened the hood in the dark with the engine running? Do you notice any arcing anywhere?
Codes: What codes do you have?
How about the plug wires? Have you opened the hood in the dark with the engine running? Do you notice any arcing anywhere?
Codes: What codes do you have?
Ok good. It's a running joke around here about the number of coil-pack that are purchased [new] and do not work.
Try swapping your old coil packs into the positions of the misfiring cylinders and let us know what you find.
- Determine 1 good coil pack hence NOT the ones that are listed as a misfire.
- Clear the Codes
- Move the 1 good coil around to where the misfire is at. (ONE at a time)
- Start the car and wait for the CEL to pop up again.
- Replace the coil (remove the test coil and put in a new coil.)
- Clear the codes
- Wash- Rinse - Repeat
As a side note: The majority of aftermarket coil-packs are junk:
Stick with the OEM units. All but one in my Suburban have lasted 250,000 miles.
Stick with the OEM units. All but one in my Suburban have lasted 250,000 miles.
So I went down this road with my truck (2V 4.6) thought I had a coil that went bad and changed them all only to discover that I had a coolant leak that was causing the issue. The plastic intakes are prone to blowing the gasket and the coolant gets into the plug hole and shorts out the spark. Check the coil boots for moisture when cool. Mine also had an internal leak that put coolant into the intake furthering the misfire but the external was the root of the misfire.
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