Originally Posted by
mgtkr1
ive got the rec'd ngk. 20 notes for x4. i think iridium plugs would be a good investment. it happened again today. ive noticed a pattern here though, its only when you ask a lot of the ignition in 4th gear. with sensible use ie plenty of revs through the gears it doesnt happen. only when sat behind driving miss daisy and going for a lazy overtake (in 4th) im gonna investigate the plugs/gap em as appropiate in the morning. could overfuelling cause this. i know the on boost fuelling been correct has a detrimental effect off boost in terms of a/f.
Do you have a boost gauge in the car? Have you looked at it and checked what's happening to the boost when you accelerate in 4th from low rpm? Sounds to me as though it's cutting the ignition as boost is going over it's limit preset in the chip (as said earlier, if it has one), as there is more load when you accelerate like this rather than accelerating using revs in lower gears.
When I've had issues with cars 'blowing spark out' it is usually in any gear/ hard acceleration it happens.
Also, thinking out of the box, is there a fault in the coil wiring causing this fault, and your failing rev counter?
We never used iridium plugs in the 90s....