Breaking up while I’m fully throttle

[Sean32]

So I have a fair amount of mods done. But my car just recently started breaking up if I do a WOT log. Only when I start from lower RPMs though. Any one have any ideas or similar issues?? Thanks

 

[SrsBsns]

What do you mean, "breaking up?"

What mods do you have done? Are you datalogging?

 

[Sean32]

It like sputters and cuts power in and out. I have an intake, catless dp, full exhaust, turbo smart bov, and ngk one step colder plugs. And I’m currently being custom tuned by Dizzy tuning


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[TyphoonFiST]

Check the battery and its connections.

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[draxxus131]

How many miles are on the step colder plugs? How far do you drive on a daily basis since you installed the plugs? Is the sputtering/breaking up happening in other gears besides 6th gear?

If you answer in this order:

More than 8k miles

Less than 10 miles daily

Does not happen in 6th gear, but all others

Then check your spark plugs for fouling or coated with dark carbon build up. Most likely the two closest plugs to the driver side will have nasty build-up.

 

[CSM]

How many miles are on the step colder plugs? How far do you drive on a daily basis since you installed the plugs? Is the sputtering/breaking up happening in other gears besides 6th gear?

If you answer in this order:

More than 8k miles

Less than 10 miles daily

Does not happen in 6th gear, but all others

Then check your spark plugs for fouling or coated with dark carbon build up. Most likely the two closest plugs to the driver side will have nasty build-up.

Sounds a bit like plugs to me too. I was at a dyno day once and a local FiST was stuttering under WOT at higher RPMs. Swapped in fresh plugs with proper gap and issue went away

 

[draxxus131]

Exact same thing happened to me a month ago while data logging. It was breaking up in the low-mid range during wot. Forgot to change my soak plugs after 10k miles.

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[GreyfiST]

Yeah my car started sputtering under WOT the last two weeks. 2 months before it started I switched to iridium spark plugs (1 step colder). I checked all my battery connections and I changed the plugs back to OEM ones but the sill issue is still happening. If anyone has any pointers they’d be greatly appreciated I’m completely stumped atm

 

[GreyfiST]

https://www.fiestastforum.com/threads/coil-pack-upgrades.20555/page-2
In case anyone is having this breaking up issue here is another forum suggesting switching the coils. My car did the EXACT thing as this guy (70K miles, upgrades spark plugs, and bigger turbo) I’ll let the forum know if it works!

 

[GreyfiST]

Yeah my car started sputtering under WOT the last two weeks. 2 months before it started I switched to iridium spark plugs (1 step colder). I checked all my battery connections and I changed the plugs back to OEM ones but the sill issue is still happening. If anyone has any pointers they’d be greatly appreciated I’m completely stumped atm

New coil packs came in and the sputtering issue was resolved

 

[HBEcoBeaST]

What's funny is everyone I know with spark plug/coil pack issues is running colder plugs. I have run OEM and 1 step colder on a E30 tune by stratified. The colder plugs started looking bad about 10k in and the OEM plugs at 50k (20k tuned E30) looked in great shape

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[GreyfiST]

Believe it or not I actually changed the plugs back to OEM from 1 step colder plugs gapped to .027 and the colder plugs were significantly more dark due to carbon build up. I think I will be running the stock plugs until I can go get another set of them.

 

[TyphoonFiST]

So what were you seeing for data on the ap3? negative corrections? what cylinders seemed to have the issue? Was there a check engine light? Did you ohm out the Coils to see what they were at? Does anyone know the spec for doing that?

 

[GreyfiST]

So what were you seeing for data on the ap3? negative corrections? what cylinders seemed to have the issue? Was there a check engine light? Did you ohm out the Coils to see what they were at? Does anyone know the spec for doing that?

Unfortunately I just didn’t drive the car once it started breaking up. The only time I drove it after it started breaking up was when I was swapping out parts. Maybe the post starter has his log.

 

[Clint Beastwood]

Anyone know if stock coils from any other ford cars count as "upgrades" for the FiST? When I had my Abarth and upgraded the coils on my wife's alfa for a remap, the stock Alfa coils were a drop-in upgrade for the Abarth that made a huge difference. Direct fit!