petrock

Bad coil pack or the coil pack not getting power/ground due to a wiring issue.

Dooney

This is definitely going to be some kind of wiring issue if you are loosing spark in all cylinders. You do not have a coil pack because you have coil on plug. I would get a wiring diagram and see what your main power / grounds are that control all of the coils and start there.

Jardine

yea, i printed a bunch of wiring diagrams. this is exactly what im looking into.

Jardine

Found all the wiring diagrams, and just trying to make sense of everything now. I plan to use my multimeter to check voltage at fuse F2.2 and see if it drops off when the car decides to sputter or die off.

The car used to have an AutoMeter tach in it (before I owned it) but the adapter and wiring is all still there which I plan to remove today. I read somewhere, that another guy had one of these and one of the wires was grounding out and causing the car to die.

petrock

If your planning on putting one lead of the multimeter on the fuse and the other on the negative battery post, you will only see a voltage change if the problem is between the fuse and the battery.

Since your ride is Coil-Over-Plug, I would do a voltage drop test on one of the coils. Don’t back-probe both wires going into the coil at the same time. You could easily short it out and fry something if the probes touch. So do a voltage drop test on the power wire and then the ground wire. A drop of more then .5 volts is excessive and indicates resistance on which ever side has the drop, or a bad coil.

While testing a coil can be done with a multi-meter, it is not easy. The refresh rate on DVM’s is not that great. You’ll see the numbers jump all over the place as the signal is turned off/on at a high rate. An oscilloscope is much better suited for the job.

Check out my write up on testing a MAF sensor with a multi-meter/volt-meter: https://mustangforums.com/forum/8109469-post5.html. It is for a V6, but should be the same for any 4 wire MAF. The colors of the wires, however, may be different.

Jardine

hey, appreciate the help but i found out the issue was in the installation of the tach. the gauge was removed without the wiring being removed. power wire was grounding out and causing the intermitten spark. problem solved!