Engine shaky after ignition but runs ok afterwards for w114 250CE

Hi,

cold start valve should only work up to 35°C and only when cranking engine. So forget it in your case.

After replacing pressure regulator (and not MAP sensor) you should check and adjust fuel pressure.

Hi Dr Jet
I checked the ignition distributor and ECU and have no problem with that. I am focusing on the AAS right now. So for it to function properly, does the AAS open after I start the engine? If I remove the small filter on the AAV and find out the engine sucks in air still, does that mean the AAV is working properly?
Thank you.
Regards
Archie

Hi Norbert
Should the AAV open after I start the engine or should it have remained open before I started the engine?

Regards
Archie

Hi Archie,

your AAV operates only on cooling water temperature. SO it must be wide open on cold engine. That means it should then suck in air. You can use a mirror to lookinto the are opening of the AAVs hose to manifold. You will see a slit that is partially covered by a piston. That should be open several mm even if engien does not run. It should close when engine reaches around 70°C engine temperature.

Hi Dr Jet
Is this the hole you are referring to (as in attached photo)?
Regards
Archie

Hi Archie,

no sorry, please look into hole where air filter is mounted.