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E Class: black smoke for a few seconds..cars..merc..tailgate…

Customer Question
Black smoke! E Class 320CDi W210...
Black smoke!
E Class 320CDi W210 - 2001; 100K miles
When pulling away from stationary or under hard acceleration, the car drops a very large plume of black smoke for a few seconds before clearing. It is so dense that cars behind flash their lights and in one instance some one came up to my wife at a set of lights and had a go at our polluting merc - on the plus side no tries to tailgate anymore!I assume that given that the smoke is black it is execess diesel being burnt and it seems to correlate to when the turbo first comes into play.
Can anyone suggest what might be causing it. It has been to my regular indie merc specialist serveral times who have replaced one of the injectors, replaced the fuel lines that were cracked and when I picked up last week said it should be fixed. However, the problem is not any better and my wallet is considerably lighter
Submitted: 8 years ago.Category: UK Car
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Answered in 9 hours by:
6/15/2010
UK Auto Mechanic: Stan, Automotive Engineer replied 8 years ago
Stan
Stan, Automotive Engineer
Category: UK Car
Satisfied Customers: 3,526
Experience: Bachelor's in Automotive Engineering, MB certified diagnosis technician
Verified

Hello,

Does your indie mechanic have a Star Diagnosis? Did any faults come up in engine control unit?

Regards,

 

Stan

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Customer reply replied 8 years ago

Hi Stan,

 

they do have STAR diagnosis, but it did not show any faults in the ecu.

 

Thanks

Sam

UK Auto Mechanic: Stan, Automotive Engineer replied 8 years ago

Hi Sam,

Make sure the indie has checked the intake manifold adjustment flaps- they tend to clog up and break off. Then it is possible smoke formation without any fault codes. Another possibility is EGR valve sticking and not closing properly. Please make sure that intercooler is also looked at for any air leaks

Of course, the fuel and air filters must be good.

Unfortunately there are a lot of causes for black smoke on these engines, but what you are describing is definitely too much.

 

Best Regards,

Stan

 

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Customer reply replied 8 years ago

Stan,

 

Thanks for this - a couple of quick questions if I may?

What is the EGR valve - what does it do?

 

The problem occurs when the turbo starts to come in

Finally, the smoke is worse when the car has been idling for a while (say when sitting at lights or waiting at a junction) and then accelerating moderately hard.

Does that help any further?

Sam

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