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Another Q About Black Smoke

jadefox

Active Member
Joined
Feb 21, 2008
Messages
719
Location
(South East) Kent
Car
GLA AMG 220 CDI
Yeah, I know there are hundreds of threads here, most of which I have read briefly on diesels smoking....but I am just looking for some reassurance or advice I guess.

Hubby recently ran some Millers through the tank because he figured it might do her some good, but after 2 tanks of diesel she's now smoking like a trouper...she looks like she's continually blowing smoke - not just when I put my foot down. It's definately black smoke, and it's not just my imagination, it's pretty constant.

I know it's usual for a diesel to smoke and she'll often give out a nice black poof of smoke when I am joining motorways or i put my foot down to get out of a junction which i can live with, but this is different...it's noticeable - my cousin was in the car behind me yesterday and called me on the phone to tell me about it - so it's very obvious (and a bit embarrassing) from behind.

I've tried to give her a damn good thrashing - sorry :o a 'hard drive' up the motorway a couple of times, litterally pedal to metal and it'll clear temporarily - for a minute or two, but it seems like when you sit then on cruise for a while again, she's back to smoking badly again.

I have asked my trusted indi to have a look & he ran an electrical diagnostic on it and said nothing came back, he said there was one error message came up to do with a coil...but he was not at all bothered about that and he ran it again and it came back clear...he did say the air filter (the one under the case in the engine which you have to unscrew to get to and it looks like a concertina) could do with changing, so i'm going to have that done next week, but other than that, he couldn't really see a reason for it, he said we'll see what happens after you've driven it for a bit with the new filter.

I guess my question is; if I change the filter will it really make that much difference? Can dirty filters really make a car smoke in the way mine is or is it likely to be something else? :dk:
 
I've tried to give her a damn good thrashing - sorry :o a 'hard drive' up the motorway a couple of times, litterally pedal to metal ....

Hope you didn't break the speed limit ;)
 
Better to accelerate quickly (within legal limits though) all the time.

Economy will suffer a bit, but you won't need snake oil like Millers to eradicate the "problem"

The smokiness is usually a sign that the engine has been nannied.
 
To answer your question ... A dirty filter on your air intake is a very common cause of smoking from any diesel engine.
Best to get that changed ASAP.
If that doesn't cure it, then it could be one of a number of causes of over-fueling, which will cause smoke.
If it's serious, a diagnostic check should pin-point it.
I have used Miller's for years in a number of diesels, (currently 2 x E300TDs), and have only ever found it to be beneficial if used as prescribed.
Good Luck

Johnsco
 
If the car is otherwise healthy, smoking as you describe is often due to oil in the turbo pipe work being expelled as and when it can ie most noticeably on low revs.

Another side effect of excess oil is gumming up the EGR prematurely.

Millers is only a Cetane booster - buying a better grade of fuel would give just the same effect without the fag of getting a bottle out, working out how much you need to put in every time you fuel up.
 
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Thanks guys - turns out I did have an underlying problem in the end. Split intercooler.....mucho pennies to fix, mucho pennies which I don't seem to have at the moment - always the way :doh:
Cost £100 for the diagnostic, replacing air filter and I needed a new belt...then about £400 next week for a new intercooler. Joy!
 
Good to hear it's sorted.
Regarding cost ... If we wanted cheap motoring, we'd drive round in Minis.
Think of the FUN when it's fixed.

Cheers.
Johnsco
 
Thanks guys - turns out I did have an underlying problem in the end. Split intercooler.....mucho pennies to fix, mucho pennies which I don't seem to have at the moment - always the way :doh:
Cost £100 for the diagnostic, replacing air filter and I needed a new belt...then about £400 next week for a new intercooler. Joy!

What a pain in the pocket!!!! :(

But at least you know their has been a problem, and it can be fixed. :D

Good luck missus. :bannana:
 
Thanks guys - turns out I did have an underlying problem in the end. Split intercooler.....mucho pennies to fix, mucho pennies which I don't seem to have at the moment - always the way :doh:
Cost £100 for the diagnostic, replacing air filter and I needed a new belt...then about £400 next week for a new intercooler. Joy!


would it be worth taking the intercooler to serck or similar for repair?
 
Unrepairable as it has plastic ends that split. Done loads of them. You get a hissing noise when acellerating and reving up.
 
Just to say the intercooler has been replaced and all is lovely now! Probably with that and a new air filter its about the best its ever been! Barely a brief whiff of smoke now when you put your foot down and seems more responsive too :D:rock:
 
I have had all alluminium intercoolers custom made for similar money. Which wont split again in the future.

Just a thought
 

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