Misfire and spark plug gap

[AquaS2]

Gents, yesterday I got around to servicing my s2 along with a set of fresh NGK BKR7EIX spark plugs.

Took the car for a spin later and everything seemed fine, pulled a tad cleaner than before but this was WOT in just 2nd and 3rd.
So I thought nothing more... fast forward to today I went for a 60 mile drive. Everything was as normal except the one occasion in 6th at 60mph I put my foot to the floor, and that's when I nearly head butted the windscreen.

It then occurred to me I hadn't gapped the spark plugs. Now can I gap them after I've used them for a few miles?

Also what's the best method to reduce the gap on the iridium plugs without damaging the electrode?

Thanks

[SteveH]

They should be gapped near enough from new, but worth checking. 0.6mm from memory. I doubt it's the plugs causing the issue. ECU has cut due to an issue. Probably a boost leak.

[macspring]

imho.

Doubt a gap 'issue' would cause that, would tend to agree that it is a boost leak issue.

Presumably the timing of the leak is just a 'confusing' coincidence.

[Vorsprung durch Technik]

Agree with the other 2,there's no way your plugs are doing this,it's down to a boost issue. Whats probably happened,when you changed your plugs and enjoyed the new friskiness of your engine with WOT you probably opened up,with a split,in what was an already dodgy hose. The exact same thing happened to me May this year.

[AquaS2]

Ah quite possibly!
From new them plugs are 0.7mm and yes I was advised to bring it down to 0.6mm, that's why I assumed that could be the culprit.
ABY with homefries and TFSI coils if it makes a difference..

[mike74]

I ran 0.7mm gap with those same plugs without issue mate. All the small pipes are silicone too so maybe a larger hose has split?

[AquaS2]

I ran 0.7mm gap with those same plugs without issue mate. All the small pipes are silicone too so maybe a larger hose has split?

They all seemed to be it 0.6mm in comparison
Fresh set of silicon boost pipes to go on this week anyway. So let's see...

[Vorsprung durch Technik]

They all seemed to be it 0.6mm in comparison
Fresh set of silicon boost pipes to go on this week anyway. So let's see...

Problem solved then!

[AquaS2]

Problem solved then!

I hope so...

Also I just took it for a quick spin and it seems perfectly normal at WOT in 1st and 2nd.
If there was a leak should it not affect every gear when hitting boost?

[newsh]

Misfire and spark plug gap

Always more likely to cut in the higher gears with more load.

Just a thought, pull the MAF connector on and off a few times and see if it's different.
A poor connection at the MAF has the same symptoms as a boost leak.

[AquaS2]

Always more likely to cut in the higher gears with more load.

Just a thought, pull the MAF connector on and off a few times and see if it's different.
A poor connection at the MAF has the same symptoms as a boost leak.

Come to think of it I did indeed pull the maf to give it a quick clean, and did notice the connector had a tiny bit of play in it when I re connected it.
Ran out of day light today to fit the new hoses, but hopefully all shall be back to normal... well here's hoping..

[AquaS2]

And to conclude this thread, it was down to a poor ignition coil.
After inspecting the plugs there seemed to be one odd one out with regards to the markings on them. So I took a shot in the dark and ordered 5 new ignition coils from Audi, ever since there's been no misfire or hesitation.

Thanks for all the input gents