GTR plugs - missing on trailing throttle at 3000RPM

[Ronin 09]

Hey guys,

I've been having issues with missing at 3000rpm on a trailing throttle, then reapplying partial throttle in my GTR.

At 50% and WOT throttle it is fine. So I'm guessing it is a spark related issue.

I've got splitfire coils and replaced the igniter, so it rules them out.

I changed the plugs today, hoping that it would solve the problem, but found actually that plug no. 2 was quite 'wet' around the thread (the electrode was clean though) compared to all the other plugs (see pics below). This is almost definitely unburnt fuel - plug smells like petrol, not oil.

So, my questions are

1. why is it missing? deteriorated wiring loom (loom from igniter to plugs?

2. i assume the missing is from cylinder 2 then?

3. wouldn't be rings on #2 would it? like i said smells like petrol not oil...

Thanks in advance

[Ronin 09]

serious - no takers?

[blind_elk]

I don't necessarily know the answer, but I would sufggest you do a bit of investigation with plugs and coil packs.

Try swapping the suspect plug to another cylinder - this will indicate if it is a fault in the original cylinder or with the plug itself. If the problem remains at #2 cylinder, then swap the coil pack with another cylinder. This way you will be able to narrow down which component is actually causing, or contributing the most, to the problem.

[brad_gtr]

Hey guys,

I've been having issues with missing at 3000rpm on a trailing throttle, then reapplying partial throttle in my GTR.

At 50% and WOT throttle it is fine. So I'm guessing it is a spark related issue.

I've got splitfire coils and replaced the igniter, so it rules them out.

I changed the plugs today, hoping that it would solve the problem, but found actually that plug no. 2 was quite 'wet' around the thread (the electrode was clean though) compared to all the other plugs (see pics below). This is almost definitely unburnt fuel - plug smells like petrol, not oil.

So, my questions are

1. why is it missing? deteriorated wiring loom (loom from igniter to plugs?

2. i assume the missing is from cylinder 2 then?

3. wouldn't be rings on #2 would it? like i said smells like petrol not oil...

Thanks in advance

I know this is an old post , but did you find out what was wrong , as I've just got the same problem .

Regards Brad