First message on this forum. Sorry about my English.
I have an A3 (8V) 1.4 TFSI 140 bhp Cylinder-on-Demand (COD). I've noticed some rattle or vibration from the engine when running on 2-cylinder mode and stepping lightly on the throttle in the 1500-2000 rpm regime. If you increase pressure on the throttle the engine engages all 4 cylinders and the vibration disappears. Also, above 2000 rpm the vibration is not noticeable even in 2-cylinder mode.
I'm pretty sure this is common to all units of this engine in the A3 or in the Golf VII (the engine is called there ACT - Active Cylinder Techonology, but it's the same as COD) . Some examples of people reporting this:
- Rumble and Vibrations, Golf7 TSI 140 DSG Seite 3 : I'm just interested if I should contact my dealer about the up... This link talks about a software update that reduces the problem
- (In Spanish. Refers to Golf VII with the same engine) Crítica personal 1.4 TSI ACT [Archivo] - Club VW Golf España
- (In French) Que pensez vous que l'Audi A3 1.4 TFSI CoD - A3 - Audi - FORUM Marques
How do you get by with these vibrations? Do you find them annoying? They are moderately annoying for me. Do you try to always run the engine above 2000 rpm to avoid them? Has anyone had a software update that solves or reduces this issue?