coil signal issues

[mattycee]

hey all, got a mk1 fg xr6t. got tuned to 390rwkw on 98, all the supporting mods for it. car was running nicely right up until a week and a bit later, the pcm stopped sending signal to coil 5. swapped coils around and the coil from cylinder 5 worked in other cylinders.

new ecu and new coils (genuine ford not aftermarket junk), ecu calibration from ford and some $$$ later, it's still misfiring. ran vac tests, checked injectors and adaptors. only thing that remains the same is harness, which hasn't been touched in any way so unsure of how it could have made the first pcm driver fail.

fingers crossed the second computer isn't f#@ked. 

has anyone else had these issues and if so how were they resolved?

my tuner isn't a ford specialist but has tuned a good handful of high power barras without fault. my fg and another customers (his is mk 2) got pretty well all the same parts and got work done at the same time have the same fault. (both copped code p1358) but my car was perfect for a week and his car didn't even make it to final stages of the tune.
my tuner and another local-ish tuner have beef which I don't want to become a part of so no jumping ship or naming them.

any help would be appreciated because it's been near a month and I miss driving my car and feeding commodores 

[k31th]

On 10/25/2018 at 10:35 PM, k31th said:

Get an entirely new loom put in place for that section that caused an issue. Replace all of the parts in the pipeline of potential failure, basically, is how I'd attack it.

^^ as per your other thread on this same topic.

[mattycee]

yeah we jumped the gun and wen't to test after new ecu and coils. the other dude I spoke of with the same issues is getting a whole new harness put in, I'll let him be test dummy and see how it goes

[k31th]

yeah; fail in testing the loom there... oh well, cost you an ecu, potentially.

[mattycee]

hopefully not, tuner will be paying for it haha