Hello there I have recently purchased a lovely 2008 Cupra with the BWJ engine code!
I noticed at idle when the car is warm it will randomly pop out the exhaust whilst misfiring and you can feel these jerks in the car!
I have been to the garage and vcds said cylinder 2 misfiring and bank1 too lean which is the first exhaust sensor, this was broken by the mechanic when I got a custom downpipe installed as it was so stuck.
Have a new one on order.
Changed plugs and coils. Still doing it.
New thermostat as it needed one and new camshaft sensor.
Compression test was also done, this resulted in the same compression on all 4 cylinders.
(Suspected leaking injector)
Got the injectors cleaned and tested they was fine still almost flowing like new and all seals replaced, also had a carbon clean!
STILL DOING IT!
Oh and i removed the metal inserts from inside the head as one of them had snapped in half from excessive carbon build up!
Must of been very lucky tbh!
Left the manifold flap in so I don’t get a code pop up! So no worries there.
I have heard the horror stories of people’s engines failing due to a dodgy injector with the same symptoms as what I have now!
Also I would like to add if I rev the engine with the clutch in whilst driving (rolling) the revs don’t seem to drop instantly,
this also happens when changing gear sometimes so it bites on the clutch in the next gear harder than it should as the revs are not falling as fast as they should whilst shifting. (Feels that way to me) (Very annoying)
Am hoping there is an air leak but I can’t see anything visually.
Thinking pvc valve or dump valve now I don’t know
Tried to give as much information as possible as I know this has been discussed a few times before and can become old very fast.
About to give up on the car but I don’t want to as it’s just had a new gearbox just before I bought it and drives lovely tbh it’s just the idle issue.
If anyone knows something that could help then I will hear from you
Thanks allot........ Dan
I noticed at idle when the car is warm it will randomly pop out the exhaust whilst misfiring and you can feel these jerks in the car!
I have been to the garage and vcds said cylinder 2 misfiring and bank1 too lean which is the first exhaust sensor, this was broken by the mechanic when I got a custom downpipe installed as it was so stuck.
Have a new one on order.
Changed plugs and coils. Still doing it.
New thermostat as it needed one and new camshaft sensor.
Compression test was also done, this resulted in the same compression on all 4 cylinders.
(Suspected leaking injector)
Got the injectors cleaned and tested they was fine still almost flowing like new and all seals replaced, also had a carbon clean!
STILL DOING IT!
Oh and i removed the metal inserts from inside the head as one of them had snapped in half from excessive carbon build up!
Must of been very lucky tbh!
Left the manifold flap in so I don’t get a code pop up! So no worries there.
I have heard the horror stories of people’s engines failing due to a dodgy injector with the same symptoms as what I have now!
Also I would like to add if I rev the engine with the clutch in whilst driving (rolling) the revs don’t seem to drop instantly,
this also happens when changing gear sometimes so it bites on the clutch in the next gear harder than it should as the revs are not falling as fast as they should whilst shifting. (Feels that way to me) (Very annoying)
Am hoping there is an air leak but I can’t see anything visually.
Thinking pvc valve or dump valve now I don’t know
Tried to give as much information as possible as I know this has been discussed a few times before and can become old very fast.
About to give up on the car but I don’t want to as it’s just had a new gearbox just before I bought it and drives lovely tbh it’s just the idle issue.
If anyone knows something that could help then I will hear from you
Thanks allot........ Dan