How to use JB4 to identify possible bad coil pack?

[ghodge]

My car currently has an issue with stuttering under load and I suspect either a bad plug or coil pack. I will be pulling plugs tomorrow and replacing if necessary but if the plugs look fine, is there a way to use a JB4 to identify a bad coil pack?

Thanks,

George

 

[cLaw]

My car currently has an issue with stuttering under load and I suspect either a bad plug or coil pack. I will be pulling plugs tomorrow and replacing if necessary but if the plugs look fine, is there a way to use a JB4 to identify a bad coil pack?

Thanks,

George

If you're not throwing a code you can do a pull and check the log. If you see a lot of timing on a certain cylinder you know where the issue is. From there you can replace that plug/coil/do what you please

 

[Gkatehis]

How can you tell if the issue is with cylinder 1. Isn't the timing on that higher, between like 30 and 50. I can't remember where but I've seen that somewhere on the forums