hello friends i have a noggy blue audi s3, 2000 plate, revo'd and forge dv007p (or something)....
my car started misfiring whilst i was driving on the motorway, no engine management light, misfire only under load... when accelerating hard. anyways took it to a local garage.... said it could be spark plugs replaced with ngk platinum - drove perfect for 5 minutes and started misfiring again....
did a bit of research, so unplugged the MAF, made no difference. took it back to the garage 3 errors on VAG-com - MAF, Secondary Air Injection Incorrect Flow (P0411), Boost Pressure Control Valve (N249): Open Circuit.... anyways garage fixed all these errors (replaced MAF) and cleared on VAG-com... drove home again started driving ok for 2minutes but under load started misfiring....
took it back to garage, NO errors on VAG now, looked at coil packs - cylinder 3 small crack, 3rd cylinder (new) spark plug - carbon fouled (dry, soot, black), replace spark plug - worked perfect for 5 mins but started misfiring again.
1. if the coil pack was faulty it would have shown on vag or engine management light would be on? (i have none) (yes engine management light works)
2. spark plug keeps fouling only on cylinder 3? (my car does need a service, what else could i check for this - fuel filter, air filter, o2 sensor etc please help)
thankyou
my car started misfiring whilst i was driving on the motorway, no engine management light, misfire only under load... when accelerating hard. anyways took it to a local garage.... said it could be spark plugs replaced with ngk platinum - drove perfect for 5 minutes and started misfiring again....
did a bit of research, so unplugged the MAF, made no difference. took it back to the garage 3 errors on VAG-com - MAF, Secondary Air Injection Incorrect Flow (P0411), Boost Pressure Control Valve (N249): Open Circuit.... anyways garage fixed all these errors (replaced MAF) and cleared on VAG-com... drove home again started driving ok for 2minutes but under load started misfiring....
took it back to garage, NO errors on VAG now, looked at coil packs - cylinder 3 small crack, 3rd cylinder (new) spark plug - carbon fouled (dry, soot, black), replace spark plug - worked perfect for 5 mins but started misfiring again.
1. if the coil pack was faulty it would have shown on vag or engine management light would be on? (i have none) (yes engine management light works)
2. spark plug keeps fouling only on cylinder 3? (my car does need a service, what else could i check for this - fuel filter, air filter, o2 sensor etc please help)
thankyou