Misfiring problem..

[Adriano]

As most of you know, I drive a 95 talon with a full 6-bolt swap. When I did the swap, I already had the AEM ems and never had any misfiring problem. Anyways, my AEM box burned up and I put the stock ecu with all the sensor back on. I swapped the injector pins and plug wires. But the car misfires and sounds like a subaru motor. It starts, revs, but barely makes any power to drive the car around. What could it be? The motor sounds like a subaru motor once I rev it. The car ran perfect before the AEM went bad. Thanks

Adriano

[gtluke]

sounds like you have an injector or coil not firing

[atc250r]

I'd do a compression test just for the hell of it. Next I'd try pulling plug wires until you can narrow it down to one particular cylinder and if the spark looked OK I'd swap the injector on the bad cylinder with another cylinder and see if the miss followed the injector or not.

John

[Adriano]

I did pull the plug wires one by one and the motor idled the same no matter what plug wire was pulled. I was cruising around 60mph and the AEM just gave out and cause the car to stall. What's the best way to check if an injector is not working/firing? Thanks

Adriano

[atc250r]

If an injector isn't working you'll first need to narrow it down to what cylinder is giving you trouble. Then, once you know that it's cylinder "X" you switch the injector from cylinder "X" to another cylinder. If the miss follows the injector then you know the injector is the problem. Before you do the test of pulling the plug wires to narrow it down you need to unplug the IAC or it will compensate for the problem cylinder and kick the idle back up before you can figure out if that's the cylinder in question. Personally, I'd do a quick compression check before I started moving injectors all around. It also could be that you've just got a bad ignitor, when the one in my one GVR4 went I had a similar problem.

John

[Adriano]

Thanks. If the CAS is reversed/180 out, could that be causing this also? Becuase with the AEM, it does'nt matter what position it was in, the car always ran the same. I might have that out of wack also.

Adriano

[atc250r]

It doesn't matter since these cars use a waste-spark set up. If it were 180 it would still fire both cylinders at the same time. What are you up to with that thing? Are you digging out the old AWD DSM for the winter?

John

[Adriano]

It's always been my DD and the car always ran solid except for little things. I'm really selling it this time around, I need something more comfy and quieter to drive around. I will be picking up a 1g to mess around after I sell it.

Adriano

[Adriano]

BTW, where in OC do you live? My GF lives in Pine Island and I'm always up there.

Adriano

[atc250r]

I'm over in Greenwood Lake. PM me next time your around and I'll give you my number.

John

[Adriano]

Ok, injectors 4 and 3 arent firing. Swapped injectors around and the injectors are fine. What could cause that?

Adriano

[gtluke]

bad wiring

[Adriano]

When I swapped pins for the injectors at the ecu plug, I didnt push the pins all the way in. The car runs like champ now. Thanks for the help guys.

Adriano

[T_K]

hehe I did something like that when I first ran my car after all the summer work. I didn't push the power trans. connector good enough and it came loose; I found that out after having the car towed. Oh well.