Hi,
I own a 290 cupra DSG 2016 with 86000km.
I noticed 2 days ago that on starts a puff of white smoke comes out of the exhaust immediately after the engine start.
I’ve never noticed it before but it could have been mixed with condensation since I bought this car on November and the days are juste becoming hotter.
The car is under warranty so I’m waiting Seat dealer to get back to me to book an appointment and as it will probably take at least 3 weeks before I get one I started digging by myself.
So :
- only one puff at start
- nothing if I start again after driving a bit (happens again after 15min or more.. the longer the bigger cloud)
- nothing on heavy acceleration
- idle steady
- no error code (except a catalyst one few hundred kilometers ago)
- no noticeable loss of power even if when I drove hard the car this morning it seemed to be less « kick in the ass » when accelerating as it uses to be when I think about it
- the cloud smells like gas (I think it is similar to the smell of when your start your car in the garage). Even though I’ve never smelled burnt oil I think it is recognizable.
- the car is not mapped, I only did a resonator delete and I have r600 intake + inlet + outlet.
- no oil consumption
- no coolant consumption
After reading some similar thread (a lot) :
Can’t seem to find a 100% cause of this.
1) Valve stem seals
It doesn’t smell like oil, it’s only at startup, no ticking noises, seems odd for a « young car » ?
Checked the spark plugs nothing to report, except one was smelling petrol and thus the thread was greasy with petrol.
2) PCV
Seems to work but don’t know for sure as I don’t know how to test it.
I did took off the r600 kit because I’ll go to the dealer and I noticed some oil in the inlet. Is it normal / noticeable ? I don’t know. I started the engine without the plug on the admission to see if the PCV valve might be opened and thus leaking some oil in the intake which burns at each start up.. but I felt no air coming from that pipe.
3) head gasket or other related coolant issue
No coolant consumption, no sweaty smell, no mustard in the oil
4) failing injector
Was thinking about an injector that would stay opened when engine is off and leaking a bit of petrol into the combustion chambers..
+ the petrol smell ?
Don’t know if it’s possible
5) last time I brought the car to Seat (December) they did mentioned they added 1L of oil (even though I think it wasn’t necessary). Didn’t check the level afterwards (I know I should have).
I did check it today and it still at max.
Maybe too much oil leading to burning oil ?
but why not before few days ago..
Maybe it will go away, if not I’d like to direct the seat tech on the right way when I’ll bring the car next month for servicing..
Hope some of you have some ideas !
Here is a video : How it looks like after a night
I own a 290 cupra DSG 2016 with 86000km.
I noticed 2 days ago that on starts a puff of white smoke comes out of the exhaust immediately after the engine start.
I’ve never noticed it before but it could have been mixed with condensation since I bought this car on November and the days are juste becoming hotter.
The car is under warranty so I’m waiting Seat dealer to get back to me to book an appointment and as it will probably take at least 3 weeks before I get one I started digging by myself.
So :
- only one puff at start
- nothing if I start again after driving a bit (happens again after 15min or more.. the longer the bigger cloud)
- nothing on heavy acceleration
- idle steady
- no error code (except a catalyst one few hundred kilometers ago)
- no noticeable loss of power even if when I drove hard the car this morning it seemed to be less « kick in the ass » when accelerating as it uses to be when I think about it
- the cloud smells like gas (I think it is similar to the smell of when your start your car in the garage). Even though I’ve never smelled burnt oil I think it is recognizable.
- the car is not mapped, I only did a resonator delete and I have r600 intake + inlet + outlet.
- no oil consumption
- no coolant consumption
After reading some similar thread (a lot) :
Can’t seem to find a 100% cause of this.
1) Valve stem seals
It doesn’t smell like oil, it’s only at startup, no ticking noises, seems odd for a « young car » ?
Checked the spark plugs nothing to report, except one was smelling petrol and thus the thread was greasy with petrol.
2) PCV
Seems to work but don’t know for sure as I don’t know how to test it.
I did took off the r600 kit because I’ll go to the dealer and I noticed some oil in the inlet. Is it normal / noticeable ? I don’t know. I started the engine without the plug on the admission to see if the PCV valve might be opened and thus leaking some oil in the intake which burns at each start up.. but I felt no air coming from that pipe.
3) head gasket or other related coolant issue
No coolant consumption, no sweaty smell, no mustard in the oil
4) failing injector
Was thinking about an injector that would stay opened when engine is off and leaking a bit of petrol into the combustion chambers..
+ the petrol smell ?
Don’t know if it’s possible
5) last time I brought the car to Seat (December) they did mentioned they added 1L of oil (even though I think it wasn’t necessary). Didn’t check the level afterwards (I know I should have).
I did check it today and it still at max.
Maybe too much oil leading to burning oil ?
but why not before few days ago..
Maybe it will go away, if not I’d like to direct the seat tech on the right way when I’ll bring the car next month for servicing..
Hope some of you have some ideas !
Here is a video : How it looks like after a night