RAIN H8R

I have an issue with my car right now. Its been running great the past year or so on AEM EMS without any hiccups. But now I have no spark on 3 and 4. I took the coil pack and spark plug from cyl 1 and tried to see if I had spark on 3 and I had nothing. I think its a computer issue. I couldn't data log my car as I didn't have my laptop. Ill do some more research tonight, and to make matters slightly worse my car is 45 minutes away.

Also, I forgot to mention that earlier in the day the car missed, so i pulled over to check it out and thought it was a coil pack that went out, so I limped it to a nearby friends house and as soon as I pulled onto his road everything went back to normal. Then, as posted in the first post, after a car show that evening I had misfires when I started the car.

Does anyone have an idea of what it could be?

tuner

It would be extremely rare to loose two coil outputs at the exact same time, but you could send the EMS to AEM for a quick diagnostic check just in case. The turnaround at AEM should be quick so your car isn't down for very long.

ap1tuner

deff call AEM and tell them your situation. i gurantee they will have either a solution or a route to follow to get it fixed fast. every time i have called them, they have had the best and most knowledgeable customer service of anywhere.

camuman

check fuses/relays under hood and under dash. verify in aem ems software that cyl 3 and 4 are not turned off for ignition <prolly not cause though>

otherwise, x3, send it back to aem for check up.

babyrosta

if you have taken your coils out right before this started happening... take them back out and look at the harness clips that plug into the coils, make sure all 3 prongs are straight and not bent. happend to me once on one coil and when I looked at aem and noticed it was reading okay I checked the clip and sure enough somehow one prong got bent

Ben-NSI

AEM coil drivers fail all the time, it's a pretty common problem. I would send the ecu back to AEM and I'm sure they will take care of it, they always do.

CourageOO7

Even with the 1052? I haven't heard of this on our platform (at least I don't recall hearing about this).

RAIN H8R

Thank you for all the replies. Is there a good number to call or just the AEM general number? Who/what department should I ask for?

I was thinking of gathering info/doing research tonight then going to the car tomorrow after work.

The only thing I can think of that I changed recently was I changed my battery tray to a different one, perhaps my battery cable is loose...

While I goto the car tomorrow should I datalog the car?

Also, I forgot to mention that yesterday, earlier in the day the car missed, so i pulled over to check it out and thought it was a coil pack that went out, so I limped it to a nearby friends house and as soon as I pulled onto his road everything went back to normal. Then, as posted in the first post, after a car show that evening I had misfires when I started the car.

(I will update the first post right now)

Spoolin

Did you swap the coils around to see if the mis-firing cylinders follow those coils? It could just be bad coils?

I diagnosed bad coils on a buddies S last week and it was doing the same thing.

ArchAngel2K

Something like this happened on my sr20 I know its a different engine and all but it also uses coil on plug coil packs. I don't know if it works the same way but the ignitor pack went bad and cooked off COP's 3&4