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V7 Sti coughing and sputtering on WOT


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The car has developed a sputtering effect on WOT from what I tested out on open roads its more likely to happen when plating my foot down in fifth or 6th gear to overtake or even if i chop down to 4th to pass from 80kmh to 110kph.

Now if I just give the car some boot through the gears once its warm and up to temp it can be fine some times not playing up at all but after a little while of driving on the motorway it will start sputtering under load.

It seems like a miss but its only intermittent and only on WOT in higher gears

Research from Nasioc suggested AFR sensor troubles but I wouldn't have a clue I might just order and change it to be safe soon but your guys thoughts would be great Im also leaning towards new coil packs maybe .

The Plugs are about 3000kms old I went with BKR7EIX this time around

Front cam sensor has been changed 1000kms ago

no CEL's have flashed while this has happened but I will be pulling codes and doing logs this Saturday with Pappu

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 Zenki said:
Coils don't light CEL that frequently for some reason. Dunno about Subies specifically, but on some cars (yes, OBDII equipped) you can completely disconnect the coil and not cause a CEL.

I'll test this tomorrow I have pulled them to do a test before but can't remember

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 johnny5 said:
The car has developed a sputtering effect on WOT from what I tested out on open roads its more likely to happen when plating my foot down in fifth or 6th gear to overtake or even if i chop down to 4th to pass from 80kmh to 110kph.

Now if I just give the car some boot through the gears once its warm and up to temp it can be fine some times not playing up at all but after a little while of driving on the motorway it will start sputtering under load.

It seems like a miss but its only intermittent and only on WOT in higher gears

Research from Nasioc suggested AFR sensor troubles but I wouldn't have a clue I might just order and change it to be safe soon but your guys thoughts would be great Im also leaning towards new coil packs maybe .

The Plugs are about 3000kms old I went with BKR7EIX this time around

Front cam sensor has been changed 1000kms ago

no CEL's have flashed while this has happened but I will be pulling codes and doing logs this Saturday with Pappu

What boost control system you running ? standard oem solenoid or aftermarket ?

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