General Doblo 1.9JTD 120BHP Black smoke cloud upon hard acceleration

[trekkingnut]

I couple of months ago I purchased a 2006 Doblo 1.9JTD 120BHP camper, had it fully serviced with new timing belt (was told old belt was a tooth out!) and it drives very well, goes like stink but noticed over the weekend during a camping trip, after coming off the motorway I accelerated quite hard from the junction at the roundabout and noticed a cloud of black smoke in my rear view mirror. It only seemed to be upon hard acceleration. Would this just be accumulated soot in the DPF being blown out after a run or something more sinister as Iit was reported on service that there were two jubilee clips missing from air intake hose downstream of air filter (hoses still connected but is that good enough?) and also oil on the big hose in front of the gearbox (intercooler hose?) - not sure if relevant or not, or could it be injector issue? - occasionally I have noticed a sort of misfire when idling at the lights but not all the time so am considering using millers diesel additive in addition to the branded fuel I always use.

any advice appreciated as do not want to cause DPF clogging (no warnings or anything but garage cleared DPF counter instead of oil counter since service when a regen was interrupted and I had oil change warning. I did the manual procedure for clearing oil change warning (throttle and brake pedal procedure) so not sure what is going on. Performance seems good, throttle response lively, turbo whistles happily so is there anything to worry about?

many thanks

 

[cris1117]

Perfectly normal, I used to rev my diesels hard just before the mot aways had clouds of black smoke and always had very low emissions on test.

 

[trekkingnut]

Hi, Thanks for reply - am about to put some millers ecomax in but have been reading on forums where egr valve not closing properly can cause an issue with black smoke as well as maf sensor connection. Will see how the ecomax goes and next oil change get garage to look into it if any problems. does DPF on the 2006 Doblo have the brains to do a regen if needed or is it purely based on ECU maths? - there are pipes going into it which i assume are to detect pressure so would hope it is smart enough to know if it is getting clogged - especially with black sooty emissions when accelerating!

 

[cris1117]

Diesel is a dirty fuel so the exhaust will always be full of soot unless it is blown out as I described.

 

[Poperon]

Hi,

Can you get black smoke when a DPF is fitted?

Isn't the purpose of the DPF to collect the soot particles which make up the black smoke?

Cheers

Ron

 

[cris1117]

I have had several diesel cars with and without a dpf and the exhaust on both always sooty, the dpf won't stop it all, just find somewhere quiet put the car in neutral and floor it for 1 second 2/3 times until it runs clean.

 

[trekkingnut]

The thing is I also have a Qubo on a 17 plate and the exhaust is clean when you put your finger inside the tailpipe compared to the Doblo which has greasy black smelly deposits inside tailpipe - probably not the best comparison as Qubo only has 25k on the clock v the Doblo`s 103k. I know the previous owner had the dpf clog code come up after using it for multiple short trips to work when he changed jobs and prior to that he never had any issues. The garage put cataclean in the tank and I have had it serviced since with new cambelt etc and they put forte diesel treatment in it so not sure if is old crud coming out or an issue with fuel mixture related to egr, air leaks on boost etc as some clips are missing. intercooler pipe near air filter box is wet with oil too.

 

[Poperon]

Can you be certain that your DPF has not been damaged or removed?

Ron

 

[cris1117]

poperon makes a valid point thinking back my old Peugeot diesel had the inside of the dpf drilled through and everything related deleted off the computer.

It was a common practice on the earlier dpf models to get rid of the eml.

 

[trekkingnut]

I assume not because previous owner had the dpf clogged issues last year and also it has done a regen since I got it (and literally after a full service) but unfortunately I had to interrupt as had got home. The heat out the back was tremendous and it was smoking badly. I took it for a run later that evening and had the oil change warning come up even though it was new oil. I did the footpedal reset procedure to cancel it and no warnings or lights since except for sidelight failure message randomly coming up even though all bulbs good!

 

[geddy1972]

i have had the dpf and egr deleted on my 120bhp doblo 57 plate. smokes alot less now than before i had it done.

 

[trekkingnut]

i have had the dpf and egr deleted on my 120bhp doblo 57 plate. smokes alot less now than before i had it done.

Did they have to remove the DPF to smash the guts out of it and how long ago did you get it done? I know the law says it is illegal and insurance could be void plus you are supposed to declare it when it selling on which makes it a minefield of potential hassles but having had the oil changed yesterday after 1200 miles after car dumped fuel into the sump (had loads of white smoke so assume it was a regen) and the car dumping fuel into the oil again within 10 miles of oil change, I am getting pretty fed up with the DPF system because how the hell is the engine meant to survive all of this fuel dumping? - the garage smelt it in the oil when they changed it and the car never even tell me it is doing a regen - unless for some reason it is overfuelling? - cambelt was replaced recently so would the garage have possibly cocked up the timing of the injector pump?

 

[geddy1972]

The DPF delete had already been done when i brought the car. it looks like a normal DPF and sounds like one when tapped with a hammer but it has a straight metal tube running through the middle of it. the software had already been done aswell.

if passes the MOT fine and has never been picked up.

if anyone says anything i will tell them i had no knowledge that it had been done.

they cannot prove that i knew about it !

ref the fuel being dumped into the oil, it doesnt sound right and for that to happen it could be the piston rings going ?

white smoke could also be head gasket ?

 

[trekkingnut]

Ignorance as you say is the best defence! -= the engine I have been told is pretty healthy and it only started the white smoke after adding millers ecomax to the tank to be fair so hope it has not done any damage. It was not overdosed either. It had cambelt replaced by a garage who moaned like hell about it and said it took them 6 hours. They also took a photo saying it was a tooth out before they did the job. could they have upset the injector pump timing? I only did 1200 miles since they did all that along with a full service but the whit smoke issue came after 100 miles of adding millers. I assumed it was a regen as it was clouds of white acrid smoke and i could smell rubber (had to be exhaust mountings as all belts ok). Because I pulled over it probably interrupted the regen,. The smoke cleared after driving on a few miles and after the oil change yesterday, I took it for a run and it was sounding good and no smoke until nearly back home when I saw some and could also smell it so I just drove on another 10 miles and gave it some welly. Wondering if I need to take it to a diesel specialist if it is not normal for it to be doing this. It must have put more fuel in the fresh oil which really makes me hopping mad!

 

[geddy1972]

i use a product called fuelset in mine.

it keeps the injectors clean and prevents moisture build up in the tank.

it seems to run alot better.

i had my cambelt done by a garage near me called small car services.

Dean there really knows his stuff about fiats and cured a limp mode problem i kept having aswell.

he is here on this forum aswell so it might be worth contacting him on here to see if he might be able to help you.

 

[geddy1972]

Small Car Services

smallcarservices.co.uk

 

[trekkingnut]

i use a product called fuelset in mine.

it keeps the injectors clean and prevents moisture build up in the tank.

it seems to run alot better.

i had my cambelt done by a garage near me called small car services.

Dean there really knows his stuff about fiats and cured a limp mode problem i kept having aswell.

he is here on this forum aswell so it might be worth contacting him on here to see if he might be able to help you.

Thanks for info. all I can say is prior to me getting the vehicle, the previous owner DID have the dpf clog code come up and he had to use cataclean and a forced regen to clear it. When I got it, it drove well and still does - it goes like a rocket so nothing much wrong that side of things so maybe the system wanted to finish what it started before the oil change but without any warnings. first time I got it from garage it DID warn me about a regen but I had just got home and there was black smoke that time. I also had MOT just before oil change and emissions were very high (he passed it by going gently on the revs) but on way home I caned it and a massive cloud of soot came out the back so events may be all connected. If it keeps doing it then delete will the next step (without my knowledge of it of course).