Hello everyone, new here so hope you can help.
I have a Seat Leon Cupra R MK1.
I noticed that the car has been back firing now and again. It tends to do it between gear changes when cold and warm. Say once or twice every 10 minutes.
I've also started getting a lot of smoke on start up, that appears to stop when the engine has warmed up. I've checked for fault codes using VAG-COM and no faults are found.
I checked the spark plugs and found:
Cylinder 1 - Red/Tan coloured - I used octane booster recently, so likely to be this by the look of it?
Cylinder 2 - Wet and sooty.
Cylinder 3 & 4 - Unsure. Started to rain and they're awkward to get to.
Maybe related, but the PCV valve has been plugged up by a previous owner.
Any ideas?
I have a Seat Leon Cupra R MK1.
I noticed that the car has been back firing now and again. It tends to do it between gear changes when cold and warm. Say once or twice every 10 minutes.
I've also started getting a lot of smoke on start up, that appears to stop when the engine has warmed up. I've checked for fault codes using VAG-COM and no faults are found.
I checked the spark plugs and found:
Cylinder 1 - Red/Tan coloured - I used octane booster recently, so likely to be this by the look of it?
Cylinder 2 - Wet and sooty.
Cylinder 3 & 4 - Unsure. Started to rain and they're awkward to get to.
Maybe related, but the PCV valve has been plugged up by a previous owner.
Any ideas?