Octavia 2018 SE 1.6TDI

Comes with no codes

runs rough from start up

smokey obviously missfiring on a cylinder

smoke clears after 5 minutes and runs fine

on live data injector number 4 is over fuelling we have replaced number 4 injector and still have the same issue also replaced the heater plugs

totally baffled

Edited 10 January10 Jan by tony1973

Was the new injector coded? Sorry if its a daft question

Alasdair

Edited 10 January10 Jan by Alasdair1

2 minutes ago, Alasdair1 said:

Was the new injector coded? Sorry if its a daft question

Alasdair

yeah all coded in

Thanks

Thats a weird one. Its a long shot but maybe a sticky/bad exhaust valve? Leaks when cold seals when hot?

Alasdair

40 minutes ago, Alasdair1 said:

Thats a weird one. Its a long shot but maybe a sticky/bad exhaust valve? Leaks when cold seals when hot?

Alasdair

Possibly Ill ask mechanic thanks

You need a leak down test on the injectors. But as with most MK3's they are all getting to an age where ALL FOUR INJECTORS need to be replaced. Don't replace just one.... because you will get failures on others very shortly afterwards. I know it's expensive but it will keep the car running for another 100k miles.

6 hours ago, varaderoguy said:

You need a leak down test on the injectors. But as with most MK3's they are all getting to an age where ALL FOUR INJECTORS need to be replaced. Don't replace just one.... because you will get failures on others very shortly afterwards. I know it's expensive but it will keep the car running for another 100k miles.

thanks for reply