I am running a V1 on my 2003 Evo 8 (settings should be similar for a DSM). The car has 4 AEM smart coils that are fired directly from the AEM sequentially using coil outputs 1-4.

The car has a misifire and sounds like a subaru. I have verified all four coils are activated and firing. Since setting up the ignition, we have not been able to get it to run properly. The coils are ran to the correct cylinders (ie, coil output 1 > cylinder 1)

The car also utilizes a 12-1 trigger setup (12 tooth crank trigger and 1 tooth cam trigger)My previous tuner was unable to get it figured out. I believe the coil and or injector phasing may be off. Any help would be appreciated. I would be happy to email someone the .cal to look into it.

Here's the phasing now. It runs but sounds like it doesn't run on all cylinders.
IGNITION PHASING OPTIONS
Igniton sync - 1.17 teeth
pickup delay comp - 112.00us
Ign Tooth #01 - 18 teeth
Ign Tooth #02 - 12 teeth
Ign Tooth #03 - 0 teeth
Ign Tooth #04 - 18 teeth

INJECTOR PHASING OPTIONS
Injector phase - 13.80 teeth
Inject Tooth #01 - 0 teeth
Inject Tooth #02 - 18 teeth
Inject Tooth #03 - 6 teeth
Inject Tooth #04 - 12 teeth


I then changed it and tried this, but resulted in no fire.
IGNITION PHASING OPTIONS
Igniton sync - 1.17 teeth
pickup delay comp - 112.00us
Ign Tooth #01 - 0 teeth
Ign Tooth #02 - 6 teeth
Ign Tooth #03 - 12 teeth
Ign Tooth #04 - 18 teeth

INJECTOR PHASING OPTIONS
Injector phase - 13.80 teeth
Inject Tooth #01 - 0 teeth
Inject Tooth #02 - 18 teeth
Inject Tooth #03 - 6 teeth
Inject Tooth #04 - 12 teeth


I then swapped ignition tooth 1&2 then swapped 3&4. No fire again.
IGNITION PHASING OPTIONS
Igniton sync - 1.17 teeth
pickup delay comp - 112.00us
Ign Tooth #01 - 6 teeth
Ign Tooth #02 - 0 teeth
Ign Tooth #03 - 18 teeth
Ign Tooth #04 - 12 teeth

INJECTOR PHASING OPTIONS
Injector phase - 13.80 teeth
Inject Tooth #01 - 0 teeth
Inject Tooth #02 - 18 teeth
Inject Tooth #03 - 6 teeth
Inject Tooth #04 - 12 teeth

Have you looked at your dwell time? Going sequential lets the coils have more time to charge & you should be able to increase this & get more spark energy. My first thought from your observations is possible spark blow-out. You can also tighten up your plug gaps and see if you notice an improvement. If you do, this would help support possible blow-out. Lastly take care with dwell times & try not to over charge which cause extra heat and can burnout the coil(s).

Thank you for the advice. I will try to tighten the gap to see if there's improvement. Right now they are at .021" (brand new copper ngk br8es')

I have looked over the dwell time but i'm not too familiar with it.

Here's a screenshot of what I have:



And here's the AEM specs for these particular coils:

I'm sorry to litter the bandwith. I have no experience with aem. To my knowledge some of the aftermarket systems number the cylinders by order of injection/ignition so:

(EFI) Logical
firing order Physical cylinder (firing order)
1 1
2 3
3 4
4 2

If above is correct then your logical cylinder phasing would be (0, 6, 12 and 18) or (6, 12, 18 and 0) teeth. Look at your physical connections for coils and cylinders. I would also read the manual.

Good luck.

from the first setup change ignition tooth 3 to the same as 2, 12 teeth, as far as i know this should work. i could be wrong but its worth a try

MIdsm said:

I'm sorry to litter the bandwith. I have no experience with aem. To my knowledge some of the aftermarket systems number the cylinders by order of injection/ignition so:

(EFI) Logical
firing order Physical cylinder (firing order)
1 1
2 3
3 4
4 2

If above is correct then your logical cylinder phasing would be (0, 6, 12 and 18) or (6, 12, 18 and 0) teeth. Look at your physical connections for coils and cylinders. I would also read the manual.

Good luck.

Click to expand...

Thanks for your input.

I definitely can try hooking up the coils physically that way and see if there's any change (IE; coil output 2 to cylinder 3). I have a few things to test first.

I believe the ignition needs to fire 180* from the injectors. Based on the phasing I have tried so far that hasn't been the case.

98MitzuGST said:

from the first setup change ignition tooth 3 to the same as 2, 12 teeth, as far as i know this should work. i could be wrong but its worth a try

Click to expand...

I'll give it a shot and let you know what happens!

UPDATE: I tried to do what you mentioned but it would not fire.

I have also tried to make the ignition 180* off from the fuel like below but no luck.

IGNITION PHASING OPTIONS
Igniton sync - 1.17 teeth
pickup delay comp - 112.00us
Ign Tooth #01 - 12 teeth
Ign Tooth #02 - 6 teeth
Ign Tooth #03 - 18 teeth
Ign Tooth #04 - 0 teeth

INJECTOR PHASING OPTIONS
Injector phase - 13.80 teeth
Inject Tooth #01 - 0 teeth
Inject Tooth #02 - 18 teeth
Inject Tooth #03 - 6 teeth
Inject Tooth #04 - 12 teeth

Did you get the smart coil settings figured out? I would like to see your .cal if you wouldn't mind.

Tried to setup sequential ignition with aem coils about a year ago without much luck. Nobody at aem was able to help me get this going. Eventually, after backfiring hard enough for my intake to come loose and frying the heck out of my starter and battery i said screw with it and set it up for wasted spark. Car started and ran great on the first try. Lol

The downside is i can't run a high enough dwell with wasted spark without overworking coils. I would love to hear of any dsm running sequential ignition. As far as i know, i have not seen or heard of one yet.

Trying to bring this thread back from the dead. I am having some similar issues with my AEM EMS-4 setup. Did we ever find a solution to this issue?

I am also interested. I am at the point of figuring out which coils I need for sequential spark for the AEM EMS v2. I want them to run directly from the EMS. Even to be pointed in the right direction would be greatly appreciated.

I was able to get everything running smoothly and figured out the ignition issues> I will go back and look at the cal file. As far as the actual coils I am running 300m coils and using a aem coil driver. I don't think the ems can fire the coils directly without damaging the ecu.