Has anybody come across this problem?
whilst drivin in 2nd or 3rd as i hit 4.5k ocasionally there is what i think is a missfire, this hardly ever happens apart from when you wanna kick the arse of a scooby or generally on cooler days, but you can trake it back down to 2nd and launch it as hard as you like and it will be fine.

 

plug gaps, get them gapped down to about 0.6 mm

 

right i have tried that, and the problem is still there

 

could be the plugs failing anyway, fit some new ones, motorcraft 071c's about 12 quid a set from msd

 

sounds like the prob i had with my old s2,it kept blowing out the spark on the plug cos the gap was too large! then found out two of the plugs were fooked,so went and got some new ones( N.G.Ks BCR8ESs) and that cured it fine! that was three years ago,now ive bin told to use cossie plugs( platinum tip style)!

 

i think it is aronic, that rs turbos are using cossie plugs with good results and the cossies are using rs turbo plugs with good results,

 

i think it is aronic, that rs turbos are using cossie plugs with good results and the cossies are using rs turbo plugs with good results, [/quote]

cossies using RST plugs?

 

yep, the 071C's that im using as are many other are rst plugs

 

so what do recommend for a s2 200bhp or more to use?

 

About 10 to the gallon...

 

I have the same problem on my 2i and i have'nt managed to solve it.