Suspect faulty computer

[mercyme]

Hi,
Can anyone advise me,please?
A class diesel emits consistent trail of excessive black smoke while moving,only problem with car, nothing else.
If it shows up as a computer fault,is it repairable or would it need to be replaced? Thanks.

 

[Swozza]

Do you have any lose in power? and is the black smoke only visible under hard acceleration?

 

[mercyme]

Hi,
Performance is good on everything,no black smoke when accelerator not being operated

 

[Swozza]

Well in my experience with diesels (limited that it maybe) black smoke signifies oil is getting into the exhaust or turbo system and is burning.

I've had black smoke on 2 previous diesels. One was an hole in the intercooler and the other was the turbo.

I'm sure someone will be able to help further.

 

[grober]

what's the age+model of car?

 

[mercyme]

Hi,
170 CDi diesel automatic,2002. regularly serviced.

 

[grober]

Could be the combined MAF/ECU UNIT- expensive to replace but the MAF section can be repaired more cheaply. A Class

However it may be the turbo oil seals have gone as suggested.

 

[jaymanek]

Injectors spring to mind for me.

 

[alexander patie]

had very similar on the same model a month or so ago, it was a split pipe to the map sensor. mercy me, check for a narrow rubber pipe going to the intake manifold, it connects to a small sensor just below the screen at the drivers side.

 

[mercyme]

Thanks for input.
I had the maf sensor replaced by Merc, they couldn't find anyelse wrong when taken back,however following traffic does pull back.
Apparently injectors are fine,hence my original Q about computer being faulty, a suggestion by merc, ho hum, I could see the £ signs in his eyes.