Missfire with new plugs

[NoGasNoGo]

I just I stalled the IE recommended plugs in my 15 GTI running stage 2 IE. It now has missfies on 3 cylinders, ran fine before. All connectors secure, any ideas?

 

[JerseyDrew77]

Which plugs are they and did you gap them properly?

 

[NoGasNoGo]

NGK R7437-9 gapped to .026 per IE recommendations.

 

[dtfd]

Did you remember to get the recommended coil grounding kit?

But in all seriousness what drew said..also what did you torque the sparkplugs at?

 

[NoGasNoGo]

Just stock grounding. Didn't torque them, just tightened them up good. Swapped the stock plugs back in and have same problem with them now. I'm assuming I damaged the coil pack boots. They were really stuck in there and took alot of force to pull out.

 

[CaptainRatty]

Just stock grounding. Didn't torque them, just tightened them up good. Swapped the stock plugs back in and have same problem with them now. I'm assuming I damaged the coil pack boots. They were really stuck in there and took alot of force to pull out.

Easy enough to swap a coil and find out. If you did it on a cold engine, that's probable.

 

[NoGasNoGo]

I swapped the stock plugs back in and still have missfires on the same ones. Ordered coils.... We shall see.

 

[JerseyDrew77]

I swapped the stock plugs back in and still have missfires on the same ones. Ordered coils.... We shall see.

I don't care what IE says, try gapping your plugs to .024 and torque your plugs to 22 ft-lbs. Also, remove your coils ONLY when the engine is warm!

 

[avenali312]

I don't care what IE says, try gapping your plugs to .024 and torque your plugs to 22 ft-lbs. Also, remove your coils ONLY when the engine is warm!

This. I also bought the (probably unnecessary) tool, but of all the times I've had to pull VW coils, this most recent was the easiest.

 

[NoGasNoGo]

Pulled coils cold. Probably caused damage.

 

[Diggs24]

Doubtful you caused damage.

Let's go back to the start. Your car has always been stage 2 IE and you are just now swapping in plugs for no good reason?

 

[NoGasNoGo]

Basically. I was feeling what I assumed were some slight misfires occasionally. Nothing major, and not bad enough to store a code. It was time to do an oil change so I went ahead and ordered the plugs with it. Now I have hard missfires with either set of plugs. The boots did stick on the plugs and took quite a bit of force to remove, so I can see that being the cause...I don't know ow for sure.

 

[Daks]

Basically. I was feeling what I assumed were some slight misfires occasionally. Nothing major, and not bad enough to store a code. It was time to do an oil change so I went ahead and ordered the plugs with it. Now I have hard missfires with either set of plugs. The boots did stick on the plugs and took quite a bit of force to remove, so I can see that being the cause...I don't know ow for sure.

Probably not, that's just pressure from the rubber.

 

[NoGasNoGo]

Put the new coils in, runs perfect. Not sure what caused the failure.

 

[Diggs24]

Wild. Must have done something to the spring inside. Perhaps sacrifice one to see what happened?