W212 CDI 2013 OM651 BLACK smoke under acceleration Help!

[mikes venture]

Replaced turbo in May 2021 as it was leaking due to DPF issue was fine until October .Turbo actuator failed, drove 3 weeks on no turbo power. Fitted actuator, black smoke started. Checked the actuator many Times was told it's fine. Checked DPF, Injectors,EGR was checked and said to be clean. Changed rocker cover breather valve as i was told there was too much pressure and it was causing oil in turbo intake and oil coming out of the compressor hose as well. Black smoke when under hard acceleration, no smoke when pedal is pushed slowly. any guesses ? Are we looking at turbo reconditioning?

 

[DSK]

My first thoughts would be air filters/air intake and MAF followed by a detailed look at the injectors and their timing. Was anything else like intercooler piping etc check for traces of oil etc?

What is smoke like? Is it oily or just smoke?


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[mikes venture]

I've changed the air filter back in august/September I live in Ireland and the Air is clean enough. Filters don't get dirty fast at all. I am currently thinking could be the MAF or MAP sensors but wouldn't they throw a code? Also weird how the smoke started just after the turbo actuator was replaced. Since the breather wasn't ventilating the engine properly the turbo was leaking oil into the intercooler and there was some oil seeping out from the compressor hose due to pressure. As for the smoke, I wouldn't know the difference. I can only see it mostly at night when the cars behind me light it up. Can barely see it when I rev it up stationary but it's definitely there if you stand at the back.

 

[alexanderfoti]

DPF is shot. You cant have any visible black smoke on a DPF vehicle. If you are seeing it, its because there is a pathway through the DPF.

It may not be the root cause, but it needs to be sorted.

The root cause is most likely a boost leak, smoke test the entire intake and check both hoses to/from the intercooler.

 

[mikes venture]

Hi forgot to mention DPF has been changed under warranty in June so its still relatively new. There was an issue with the blocked tubes shortly after which would cause DPF to regenerate frequently. This was fixed by clearing the tubes and replacing temperature and pressure sensors. Worked all fine until the previously mentioned actuator failure.

 

[mioba]

Is the actuator right for the car. They usually have a G code on.
PCV changed?

Get to a decent garage....throwing parts will (is) costing you big.

 

[LostKiwi]

As @alexanderfoti if a car has a DPF it should never smoke.
Black smoke is an indication there is excessive fuel for the amount of air. Therefore it can only be either a boost leak (turbo hoses are well known for splitting), intercooler has a hole (easily caused by corrosion or stone damaged), over fuelling from bad injectors (I'd expect other issues as well).
Fix the smoke then fix the DPF as it is definitely faulty.

 

[mikes venture]

It was all done under warranty which is running out next month. Need this fixed asap as the headache has been costing me already. I'd assume they know what actuator to put on since its warranty-approved garage. As for PCV, the rocker cover has been replaced with the breather valve last week. I am not seeing oil seeping past hoses and onto the subframe anymore. Too early to say but might have fixed the internal pressure issue. I have just came back from the garage and he will inspect the DPF next week. The smoke is not as excessive or thick as you would see on old diesels. I would think if DPF is not doing its job this would be the amount of smoke visible? Thank you all for input! this is my first forum and appreciate all the knowledge and help!

 

[LostKiwi]

A DPF removed the particulates in the exhaust. Black smoke is caused by soot particles within the exhaust. You should not be able to see any smoke on a car with a DPF as the DPF should trap them and burn them at a later date.

 

[mikes venture]

I was thinking that as well but slightly disregarded that since it was replaced. But if it was actually working properly even if it was running rich from any causes(say a boost leak) id imagine it would trap it and would just burn more frequently. But still, shouldn't see any smoke. Would that be the correct way of my thoughts? Thanks again!

 

[M80]

Not wishing to upset anyone's theories here but I've replaced DPF's due to evidence of smoke, and still seen smoke at the tailpipe afterwards.
That theory has had me chasing my tail and replacing DPF's w/o good reason.

I would have thought though that evidence of smoke at the tailpipe would cause regens more often.
Cure the smoke, it's an MOT fail anyway, and then I wouldn't see reason to have concern around the DPF if the emissions are met.

 

[mikes venture]

Yep thats a concern too. Hopefully its sorted soon enough

ive uploaded this video to see the smoke at stationary.

 

[mioba]

OP have you had any codes read or has a competent garage read the live data.

I dont understand that if its under warranty, why is it costing you so much.

Just my further tuppence.

 

[mikes venture]

I've my own OBD reader I'm not seeing any codes. The only one I saw was when the turbo actuator failed. Gave boost under pressure. Regarding Live data, I am not sure. I'd assume they'd look at it before putting parts on. Could be wrong. My hope is to find out next week whats going on

 

[LostKiwi]

That's more black smoke than mine put out with no DPF.
Another thing worth doing is running some fuel system cleaner through I used Archoil 6400-D followed by a tank of 6900-D and it helped reduce smoke, however as has been mentioned several times a good DPF should produce zero visible smoke.

 

[mikes venture]

Yeah I've been adding diesel fuel system cleaner and dpf cleaner many times with no joy. A bit conflicted with m80 comment how replacing the DPF was no help for him. I'm also hearing a whooshing sound from the exhaust could hear it a bit on the video. I didn't seem to hear it before. I don't hear any noise from the hoses either if it was a boost leak hope it's an easy fix. Hoping my night mare will end soon

 

[marksimp]

Yeah I've been adding diesel fuel system cleaner and dpf cleaner many times with no joy. A bit conflicted with m80 comment how replacing the DPF was no help for him. I'm also hearing a whooshing sound from the exhaust could hear it a bit on the video. I didn't seem to hear it before. I don't hear any noise from the hoses either if it was a boost leak hope it's an easy fix. Hoping my night mare will end soon

Hi, did you ever get to the bottom of this? I have a similar issue with my e250.

I have no power issues, no engine light, no engine codes and get 50mpg.
car puffs a little smoke but only on full throttle and the MOT guys say no.

I have checked the pressure sensors, replaced oxy, checked all boost pipes and covered the whole thing in soapy water trying to find leaks. 2 oil changes, fuel filter and air filter. Checked the intake manifold and cleaned out the mixer. I have a MAF on order but after that, I'm at a loss.

Think I will have to take it to my local MB indi and see if they can see any issues with the injectors.

 

[remuspur]

Any update?

 

[marksimp]

Any update?

I got mine through its MOT.
Even though I've taken off and had the injectors tested (all ok) and cleaned out everything from the intercooler all the way to the inlet valves (and de-gunked the lot, including the manifold). Refitted and pressure tested.
Still smoked.

I took off the whole exhaust and washing it out with a pressure washer. It was full of black crap. I then had to drill a small hole in the bottom corner of the cans to get the water out and then weld them back up.