As post says really.
My cupra was missfiring on tickover (standard car) sounded like exhaust blowing and popping.
Dealers didnt really take it seriously and just changed the exhaust which didnt fix it.
So then over a matter of 4 weeks decided to change random parts , maf, injectors, coil packs oh and a new cat , all of which didnt do a thing.
In the end i phoned SEAT customer care and my car was booked to go back in.
SEAT technical told the garage to carry out a few tests and found the compression ratio on cylinder 3 to be very high , which lends itself to a valve problem.
cylinder number 3 sticks out because there have been a few S3 boys having missfiring with cylinder number 3 as well.
any way the dealers were told to remove the head and strip it down and inspect it and report their findings.
Basiclly the exhaust valves on cylinder number 3 were siezed , SEAT instructed a new head to be fitted , oh and new cat and a new ecu , but its still in the garage and wont be ready until the end of next week
so if anyone else gets the same symptoms dont rely on the garage telling you there is nothing wrong , mine had no fault codes but needed old school diagnostics to find the fault.
The whole process has taken 4 months to get resolved , with the car effectivly running on 3 cylinders for the last 7,000 miles , the garage didnt take it seriously at all , but i have requested that the garages MD be present when i collect my car.
to say i was fumming would be an understatement
My cupra was missfiring on tickover (standard car) sounded like exhaust blowing and popping.
Dealers didnt really take it seriously and just changed the exhaust which didnt fix it.
So then over a matter of 4 weeks decided to change random parts , maf, injectors, coil packs oh and a new cat , all of which didnt do a thing.
In the end i phoned SEAT customer care and my car was booked to go back in.
SEAT technical told the garage to carry out a few tests and found the compression ratio on cylinder 3 to be very high , which lends itself to a valve problem.
cylinder number 3 sticks out because there have been a few S3 boys having missfiring with cylinder number 3 as well.
any way the dealers were told to remove the head and strip it down and inspect it and report their findings.
Basiclly the exhaust valves on cylinder number 3 were siezed , SEAT instructed a new head to be fitted , oh and new cat and a new ecu , but its still in the garage and wont be ready until the end of next week
so if anyone else gets the same symptoms dont rely on the garage telling you there is nothing wrong , mine had no fault codes but needed old school diagnostics to find the fault.
The whole process has taken 4 months to get resolved , with the car effectivly running on 3 cylinders for the last 7,000 miles , the garage didnt take it seriously at all , but i have requested that the garages MD be present when i collect my car.
to say i was fumming would be an understatement