D
Deleted member 12080
Guest
Hello, I have a 2006 Audi A4 2.0T FWD with the CVT transmission. It has 131,000 miles.
I have VCDS and it is pulling two codes
16684/P0300/000768 - Random/Multiple Cylinder Misfire Detected
16685/P0301/000769 - Cylinder 1 Misfire Detected
Symtoms:
The car starts without too much hesitation, but when cold the whole car shakes pretty hard. I believe it is definitely running on 3 cylinders when cold. But once the car warms up, it doesn't shake anywhere near as bad and drives okay. There is still hesitation but the vibration is reduced greatly, and I was able to drive it 30 miles home without much of an issue. I've drove a Toyota Camry before with only 3 of 4 cylinders running and it barely had enough power to do the speed limit.
The CEL flashes when the car is first started and the engine is cold, but once it warms up the CEL becomes solid and stays lit.
Things I have done trying to solve the problem:
I switched cylinder 1 and 4 coils, cleared the codes, and started the engine again. Eventually the same codes came back on. To me this rules out the coil, but I might change them all just to be safe. At least one of them has been changed before as it does not have numbers written on the top like the other 3 do. I pulled all the spark plugs and they all look rather similar. Light brown color on all of them. They are Autolite plugs (im not a fan) and will be changing those too, but I don't believe they are the problem.
The previous owner took it to a mechanic and he said it was carbon buildup on the valves. I haven't looked into this much yet but I do know that carbon buildup is a common problem on cars with direct injection, but I am unsure if that could cause this misfire. I will look more into that and how hard it is to clean them. I don't want to pull the whole head off if I don't have to.
Looking at Ross-Tech Wiki, it could be a lot of things causing this but I was hoping someone would have some input.
Thanks for your help!
-Derek
I have VCDS and it is pulling two codes
16684/P0300/000768 - Random/Multiple Cylinder Misfire Detected
16685/P0301/000769 - Cylinder 1 Misfire Detected
Symtoms:
The car starts without too much hesitation, but when cold the whole car shakes pretty hard. I believe it is definitely running on 3 cylinders when cold. But once the car warms up, it doesn't shake anywhere near as bad and drives okay. There is still hesitation but the vibration is reduced greatly, and I was able to drive it 30 miles home without much of an issue. I've drove a Toyota Camry before with only 3 of 4 cylinders running and it barely had enough power to do the speed limit.
The CEL flashes when the car is first started and the engine is cold, but once it warms up the CEL becomes solid and stays lit.
Things I have done trying to solve the problem:
I switched cylinder 1 and 4 coils, cleared the codes, and started the engine again. Eventually the same codes came back on. To me this rules out the coil, but I might change them all just to be safe. At least one of them has been changed before as it does not have numbers written on the top like the other 3 do. I pulled all the spark plugs and they all look rather similar. Light brown color on all of them. They are Autolite plugs (im not a fan) and will be changing those too, but I don't believe they are the problem.
The previous owner took it to a mechanic and he said it was carbon buildup on the valves. I haven't looked into this much yet but I do know that carbon buildup is a common problem on cars with direct injection, but I am unsure if that could cause this misfire. I will look more into that and how hard it is to clean them. I don't want to pull the whole head off if I don't have to.
Looking at Ross-Tech Wiki, it could be a lot of things causing this but I was hoping someone would have some input.
Thanks for your help!
-Derek