Misfire count and should i be worried??

Hello everybody,

I was bored and decided to mess with the AP a little and changed some parameters to display up on the AP. So I found the setting for Misfire Count and thought hey what the heck it may be worth it to keep tabs on this. In the old days misfires meant something was not good/right. After doing a 90 mile round trip yesterday on my 91 stage 2 tune it started bugging me seeing well over 100 misfires for the entire trip. This morning did the same route dropping the wife early on for her shift and I decided to change the maps back to my E30 tune and loaded in the e85 to proper mixture, I still got quite of few misfires as show in the picture it was quite a few but roughly half as many as I had with the 91 tune.

Now the big question is this of any concern, should I be worried or should I be looking to change out some things??
I am running the step colder plugs that came pregapped by whoosh. Tunes are by dizzy as well.

anybody else getting misfires like this??

anybody out there have any input on the misfire in the ap I still get shitloads of misfire counts but do they mean anything serious? I replaced plugs with pregapped ones just in case and it made no diff so far still get up to 100 misfire counts driving 60 miles. even tried switching maps to cobb stage 2, dizzy e30 and 91 really made no diff still just racks up counts like in the pic.

Hopefully this helps a bit, not sure if you've read it already though http://www.stratifiedauto.com/blog/misfires-and-the-ecoboost-when-should-you-worry/

I think the big point is that even just lugging your engine in first/second gear could cause those knock corrections. It's my understanding that it's better to pay attention to ignition corrections ("Ign. Corr Cyl1" for example) because any negative corrections seen on that parameter means it's pulling timing due to the detected knocking. Positive corrections are fine as far as I know. Might be best to watch those parameters for a while along with the misfire count to see if your timing is being pulled due to the detected knock. If everything looks good with that you should be alright

definitely helps great info I only got one negative correction on cyl #4 during a 60 mile drive I did today

don't really know how bad that correction is but I suppose I can pull the plug tomm and double check it its pretty new though only been in there 2 months and I replaced the last set after 10k just because I didn't know better.

Maybe someone else can chime in on this, here's what else I could find:
"Multiple drops in ignition correction at the same RPM and across multiple cylinders likely mean that you may need the tune touched up or need to use better quality fuel". This, again, was information from Stratified (they've got a cool blog, lol).

Since you're not seeing any multiple-cylinder negative corrections, and with you being in Colorado I imagine they've switched to winter-blend fuel it could just be lower quality fuel. If it was me, I'd keep monitoring to see if it's consistently having high knock count with negative corrections and if so, go ahead and talk with Dizzy about having them look at some datalogs

ok so the pattern is becoming clear it only does negative corrections on cylinder #4 every time I drive it is the only one that gets the - correction/ 1-3 never gets a - correction. now to find what is actually causing it. If it was bad gasoline wouldn't I be seeing - corrections across all cylinders??? either way seems like the issue is with #4

As long as you don't have negative corrections on wide-open throttle you should be fine. And as long as the missfires aren't climbing rapidly in a short period of time I feel that you should be alright too. Still couldn't hurt to take some datalogs tho.

It wasn't on a Fiesta, but my experience with that kind of anomaly is that it ended up being a bad coil pack. It wouldn't fire every time, so it had to be fired repeatedly. Eventually it died, disabling the car completely.

I was wondering about that I might try and switch the coilpacks around and see if the corrections change cylinders then just to rule out the coilpack thanks again.

it is normal to see some negative corrections or not at all?

Negative corrections can occur from time to time. Happens on my car sometimes too. That's not much of a concern. It IS a concern on wot.

that's what worries me I got them going from 30 to 85mph merging onto a highway yesterday. this time I got -1.5 on several cylinders. not a big fan of cars that are problematic and this car seems to be loaded with them already at 58k. thanks for the input fellas I think ill just go back to stock instead and save myself the headache the meager gains don't seem to be worth the hassle for me.

Put 1 gallon of e85 in for your 91 tune.

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interesting I did not know u can do that but heck ill give it a shot if it helps.

I live in NC we have 93. The guys out in California have crap 91 gas, so the 1 gallon of e85 helps. Depending on how low you are when you fill up every other time may be enough.
@Clint Beastwood does this. You could ask him about it.

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Where is Alex@stratified? He can help explain this better...Maybe he will see this.....

I did the gallon of E85 to avoid the negative corrections in the summer time. Now that it’s a frosty 55 degrees my car seems to do better on the straight 91.

Another way to not worry about it is to drive without your AP hooked up (if everything seems to be running fine).

Do you have stock spark plugs? My car was showing a decent amount of misfires as well but I know what a stage 2 tune on stock spark plugs isn’t good. I have my #6510’s coming is asap.
I also run a gallon of e85 and run a ots 93 map and that helped a bit with the misfires