Mb classe B, 200 cdi, edc16c31 year 2008

[gezame]

428901Hi
Mb classe B, 200 cdi, 103kw, edc16c31 year 2008
I need to increase rpm in this file up to about 800rpm.
The car when heated, idle becomes unstable, and oscillates between 750-850 rpm.
Cold engine, everything is perfect.
Car does not have any fault code, and everything is checked, injectors, depression, egr, turbo, etc.
Simply by increasing the throttle relay to 800 rpm, and the revolutions no longer oscillate, the engine remains stable.
Any can help.

[teerak2uk]

Throttle air bypass solenoid clean?

[gezame]

Hi
Thank you for response.
yes
is clean

[dune85872005]

check injection pump........on heat hydraulic head is bad .....

[gezame]

Hi,
in the end, problem is in the flaps, i make flaps-off, and all ok.
Thank for all help.
Br.