2012 Mustang GT Misfire

2012GTCS

New Member
Oct 4, 2020
3
0
1
23
New York
Looking for help on my misfire issue i've been having on my 2012 GTCS. I am getting misfires on cylinders 2,4,7 and 8. I have checked spark plugs coil packs and fuel injectors already. Have no idea what is causing it. Any help is appreciated.
 
  • Sponsors(?)


Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
29,356
11,123
234
Box behind Walmart
www.stangnet.com
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?
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
29,356
11,123
234
Box behind Walmart
www.stangnet.com
replaced all the coil packs with new ones
havent checked plug wires
codes: po302 po304 po307 and po308

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.
 

kiddiccarus

The first widely accepted Tranny
15 Year Member
Dec 24, 2003
1,560
937
143
30 Mins from a Ragged GT
www.angelfire.com
  1. Determine 1 good coil pack hence NOT the ones that are listed as a misfire.
  2. Clear the Codes
  3. Move the 1 good coil around to where the misfire is at. (ONE at a time)
  4. Start the car and wait for the CEL to pop up again.
  5. Replace the coil (remove the test coil and put in a new coil.)
  6. Clear the codes
  7. Wash- Rinse - Repeat
 
  • Like
Reactions: Noobz347

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
29,356
11,123
234
Box behind Walmart
www.stangnet.com
As a side note: The majority of aftermarket coil-packs are junk:
Nd9GcSK-vTm_wGkdptq8jX9q7RVqiDtWhiw7TCSpw&usqp=CAU.jpg


Nd9GcQuzv09ylXVOG1NesjUN1a4AnfirAfppuejaA&usqp=CAU.jpg


Stick with the OEM units. All but one in my Suburban have lasted 250,000 miles. :shrug:
 
  • Agree
Reactions: kiddiccarus