Q: Cylinder #2 Not Firing (1997 Ford Mustang, V6, 3.8L)

Discussion in 'SN95 V6 Mustang Tech' started by Tony360, Jan 20, 2008.

  1. Hello Folks,

    I need some help diagnosing a rough engine problem, any input would be very much appreciated.

    1997 Ford Mustang, V6, 3.8L
    - Car has lost power and engine is running rougher.
    - Autozone diagnosed that cylinder 2 wasn't firing.
    - Removed #2 spark plug wire from ignition module, held close to
    module and no spark.
    - Swapped #2 & #6 wires and #2 wire was okay.
    - Cleaned and regapped #2 spark plug - didn't fix problem.
    - Tested #2 plug by swapping #2 & #6 wires at ignition module and saw
    a spark from #2 engine cylinder to #6 ignition module.
    - Measured primary & secondary resistance on ignition module and they
    were within specificaiton.

    Question: what are possible causes of no spark from ignition coil
    for cylinder #2 and how can I troubleshoot? Ignition coil pack? Ignition Control Module? Crankshaft sensor?

    Note: some friends have told me that it's likely to be the coil pack (sealed module located on the top front of the engine). My hesitation to agree is that the coil resistance checked out okay.

    Thanks for your help,
  2. Replace the plug. It may have failed internally, and for $2 it's worth replacing to see if that fixes the problem.

    If that doesn't do it, your coil pack is probably defective. I can't think of how the failure could be anywhere else.
  3. Could be a bad injector test it with a noid light.
  4. when i had the issue my injector was not firing. i replaced the injector still nothing, i had to replace the computer.

    to check to see if your injector is firing....hold a screwdriver to the injector whle the car is running and touch the other end of the screw driver to your head near your ear....listen for a ticking/knocking noise and compare that to another injector.