[GOTMH8N]

I have been driving with JB4 in Map 5 but have been getting the warning light when I go WOT. I also am having a soft sputter at idle and from the research I have done it sounds like a bad coil. To check I need to clear codes, switch the coil, and drive until the code pops again correct? The plugs were just changed before I bought the car, which is leading me to believe it may be a bad coil. The idle engine sputter isn't bad but it's there so something is up. So, I have changed to the stock map in the meantime.

I tried using the steering wheel controls to "read codes" but I couldn't figure it out lol Do I need to download some sort of JB4 computer software to read codes/ data log on the laptop? Also, I do have the USB/OBD II cable.

Thanks!

[JStang]

Originally Posted by GOTMH8N

I have been driving with JB4 in Map 5 but have been getting the warning light when I go WOT. I also am having a soft sputter at idle and from the research I have done it sounds like a bad coil. To check I need to clear codes, switch the coil, and drive until the code pops again correct? The plugs were just changed before I bought the car, which is leading me to believe it may be a bad coil. The idle engine sputter isn't bad but it's there so something is up. So, I have changed to the stock map in the meantime.

I tried using the steering wheel controls to "read codes" but I couldn't figure it out lol Do I need to download some sort of JB4 computer software to read codes/ data log on the laptop? Also, I do have the USB/OBD II cable.

Thanks!

Figure out which cylinder is giving you the misfire and swap that coil with the coil from another cylinder. If the code follows the coil, you've got a bad coil.

Pretty simple solution and good luck!

[GOTMH8N]

I want to get this figured out asap because there is a $25 dyno special going on at a local performance shop that I am trying to hit up but clearly don't want to do it with a possible bad coil

[benzy89]

If you go to COBB's blog, in the BMW section there is a video for "Diagnosing Misfires". Part of the video specificially references ignition coils & moving them aroudn