I am in the middle of a engine build. I am using the 2.0 bottom from a passat (ADY). and will be using the head from my 1,8. Complete with k-jet. Will also install knocksensor, just to be safe. And have converted to serpentine belt.

And also a good idea is to check the fuel pressure. Mine where sputtering and didnt idle well when cold. Then i checked the pressure. almost 0 when cold. Made the wur adjustable and raised the cold pressure to 1,5 bar. Then it starts just fine and the idle is stable.

Hello
I hope that i can write so you understand me( Iam from Sweden)
I have a problem with my car. During warm-up the idle is really bad, and the throttle response as well.
The problem starts about after 1 minute after start of the car. And is like that about 3-5 minutes.
And if the car have been ...