W211 puff of smoke on startup

[boxer 01]

Fits the symptoms. Post #17 is very probably the cure.

I was thinking of testing the outputs from relay with a voltmeter. On cranking I should get 4.4v on each for a few seconds.

 

[Smiley]

As said above I had exactly the same symptoms as you have now a few years ago - I looked on here at the time and others had had the same problem - fixed with a new relay. On the strength of that I bought the new relay and it did indeed fix it.

 

[boxer 01]

As said above I had exactly the same symptoms as you have now a few years ago - I looked on here at the time and others had had the same problem - fixed with a new relay. On the strength of that I bought the new relay and it did indeed fix it.

Were you not getting a fault code, which one did you fit one from mb or a beru off autodoc

 

[Smiley]

There was no EML, can't remember if there was a code. What I do remember is that I had the same symptoms, turning over for longer before starting and a puff of smoke on start up. Others on here had had the same symptoms as well - cured with a new relay. I bought mine from MB. Whilst the autodoc prices are good the delivery times and customer service are not - and the MB relay was not an expensive item.

 

[boxer 01]

There was no EML, can't remember if there was a code. What I do remember is that I had the same symptoms, turning over for longer before starting and a puff of smoke on start up. Others on here had had the same symptoms as well - cured with a new relay. I bought mine from MB. Whilst the autodoc prices are good the delivery times and customer service are not - and the MB relay was not an expensive item.

Ok thanks for your help smiley, will definitely keep your advice onboard. I got a relay off autodoc maybe 3 years ago and it looks like it's falling so MB is the way to go, although I have had quite a few service and brake parts off autodoc and never had any issues, delivery time is usually a week give or take.

 

[JamDebs]

I had exactly the symptoms and problem you describe on a v6 211 and a new glow plug relay cured it 100%. I bought a genuine one from MB. An easy and cheap fix.

How much was the relay from MB ? Ta

 

[Smiley]

Sorry can not remember exactly but I thought it was £50 or £60. But looking at the price now either they have gone up massively or my memory is suspect.....

 

[boxer 01]

Just an update for the people who contributed and of course those who have been reading this thread. I have fitted a new mb relay and it has cured the problem, car starts first time no problems.
Thanks to everyone who contributed.