corsa 1.2 53 reg we had a fuel problem before found out it was knock sensor any its all ok now but the black soot is not as bad as before it wont go away oh yes when i done head gasket the egr body was blocked up with black soot cleaned all out but we havnt got a egr valve on ours only body just done a service as well also used fuel cleaner once it helped alot thanks

ali, September 2010

the soot may take a long time to go away,do you do a lot of town driving?maybe a good run down the motorway may help,a good indication if your mixture is set ok is to remove a plug and have a look at the colouration on it,a nice light brown should do the trick

wickham, September 2010