idle troubleshooting on 1,8T Audi engine (part2)

[s.roul]

Hello ,

  thanks for your answers. I forgot to tell I have already cleaned the
  throttle body with no result. Yhe idle after cleaning is still
  unstable.

-- 
Best regards,
 s.roul                          mailto:s.roul at free.fr

> Hello
> 
> my 1,8T engine (code name AMK) has now got a unstable idle (changing
> between 720 and 760 rpm) instead of a rock stable idle I got before.
> 
> Engine has now got 40 000 miles, I don't know what I should do... I(ve
> already changed the MAF sensor but changed nothing to the idle
> trouble.
> 
> I've seen on my VAG-COM that on channel 1, the lambda factor is always
> changing between -3,9 and + 3,6... is it normal?
> the lambda factor on channel 6 is rock stable at 1,6%.
> 
> Best regards,
>  s.roul