Cylinder 4/random missfire

[Hydr0]

Check engine light on, loss of power, etc. codes: p0304, p0301, p0300 and p1364. Swapped coils from 4 to 5, coil works on cyl 5, nothing works on 4, checked three wires at connecter-left wire- 13.8v center-0 right wire-13.8. Still new to diagnosing these things and a little confused why I'm not getting spark. Replaced plugs as well.

[vavJETTAw36]

You're getting voltage at the pins? Then how are you "not getting spark"?


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[Hydr0]

Got the voltage at the plugs yes. Swapped coils, cyl 4 is not firing, pulled both 5 and 4 coils while running as well and 5 was sparking, 4-nothing.

[vavJETTAw36]

Got the voltage at the plugs yes. Swapped coils, cyl 4 is not firing, pulled both 5 and 4 coils while running as well and 5 was sparking, 4-nothing.

What's the voltage on a known working plug? Can you test ground continuity?


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[Hydr0]

Same voltage as a working coil. I noticed cyl 5 has two wires for ground which 4 and 6 have one. I really need a wiring diagram of the ignition system.

[vavJETTAw36]

Cyl 4,5,6 are on same bank. I suggest swapping the icms. I believe you can simply unclip connector and swap them. Maybe not. Maybe you got to unbolt the icms from the intake and swap positions. See if the misfire moves to cyl 1


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[Hydr0]

I swapped the icms. It moved to cyl 1. Still has a steady missfire but is running better for some reason haha. Gonna order one and see if that works. Thanks for your help

[vavJETTAw36]

I swapped the icms. It moved to cyl 1. Still has a steady missfire but is running better for some reason haha. Gonna order one and see if that works. Thanks for your help

Glad you got it worked out. Make sure you reapply thermal paste to the mating surfaces of the ICM and heat sink. Youll want to clean it first with rubbing alcohol or another cleaning solvent. Same paste you'd use on computer processor chips.