'94 E320 emissions problem

[Edcam]

I have a '94 E320 which I have owned and loved for c. 25 years which is now in need of some restoration. One of the issues causing MOT failure is emissions. Mercedes main-dealer not interested in the job. Gave it to an ex-senior technician of the main dealer who set up on his own a few years ago and was recommended to me by someone I trust. He identified the throttle housing to be causing the problem. He sourced and fitted a reconditioned one but it didn't solve the problem. Says he has been able to source another (in case the first was faulty) but the problem is that "the polarity on the housing is the opposite of the car and he doesn't feel confident enough in his knowledge of the electronics to re-work the wiring" and has now (politely) passed on the job. I have tried speaking to couple of other companies who I hoped might be able to help me but both have declined. One of them told me that I needed to have the original part number for the housing (which I no longer have) to be able to source the right replacement housing as "there are 7 or 8 versions" and without it the "car is scrap". The ex-main dealer technician that originally looked at it for me tells me that is incorrect and that all you need is the chassis number. Does anyone know of a reliable company that could look at this problem for me? I live in Cambridge area but am prepared to travel. Any help would be really appreciated. Thanks.

 

[LostKiwi]

What is wrong with the emissions?

 

[Edcam]

Thanks for your reply. It was MOT‘d a couple of years ago and it failed on emissions - sorry, that’s all I know. I don’t recall being told detail of the emissions issue - just that it failed. Part of my problem is that car mechanics is obviously not my area of expertise but I cant seem to find anyone to help look at the problem for me. If you know of anyone would be very interested to hear. Thanks.

 

[LostKiwi]

Where are you based?
If you're anywhere near Reading then Ian at Star Motors in Caversham might be worth a shout?

 

[V6Matty]

Where are you based?
If you're anywhere near Reading then Ian at Star Motors in Caversham might be worth a shout?

Cambridge area Al, so I think it’s going to be Phil over at Welwyn merc

 

[Edcam]

Thanks both. Happy to speak with both the suggestions. Car isn‘t driveable but will give anything a try. Would you be able to let me have contact details? Thanks again.

 

[LostKiwi]

2 minutes on Google will get them.

 

[Edcam]

Thanks