over fuelling??

[chris999]

hi there just a quick one.... changed my spark plugs around about 2000 miles ago then i was having quite severe intermittent misfires when the turbo was at about 5psi+,i took them out out and the tips were rather black, so i cleaned them up with a wire brush then all misfires go and runs fine now. I was just thinking that after only 2000 miles they shouldnt look that bad, although i don't hang about and do give it some beef!!
is something up?

 

[pdcupra]

were the plugs dry? if theyre black it normally means the air/fuel mixture too rich and can sometimes be caused lots of low speed driving, but that one sounds like its not the problem! is your air filter clean also?

 

[ibizacupra]

was the engine fully warmed up and driven up to temp when you viewed the plugs or was it cold start (hence sooty)

i have had misfire under boost and it turned out to be coil packs going weak.

 

[chris999]

well i dont do lots of slow driving thats for sure! and when i put the new spark plugs on i also put 4 new coilpacks on, yeah i viewed the plugs when the engine was cold. i will take a look at the filter. cheers gents.