Thanks for the info - yes, I was under the impression that I shouldn't even know what's happening under the bonnet - it should just take care of itself. But the dealership are rejecting my rejection of the car(!) as they say there is no fault. Unless they can prove a fault I cannot reject the car, even though every fibre of my being is screaming at me to do so. I know there is something wrong. Impossible to get them to admit it. So what can I do now?The OP said, "continues to inject fuel into the exhaust system"
A popular misconception, I too had images of a 5th injector somewhere in the exhaust system upstream of the DPF when first reading up on the subject, but could never find it in a manual or under the bonnet, all became clear when I read the MB OM651 System Description doc I referred to in my previous post, I think it's important to understand this process with a view to evaluate the symptoms of overheating, burning smells, and a bonnet that is "Hot to touch" below is another excerpt from the same document which details how the exhaust temperature is raised to trigger a regen, there are three modes of fuel injection, pre, main and post: I hasten to add this is a system description of the OM 651 Engine, others will I've no doubt vary.
Post injection
The CDI control unit initiates up to two post injections following on from the main injection.
The first post injection serves to increase the exhaust temperature, which supports the conversion process for exhaust components in the oxidation catalytic converter. The second post injection is performed depending on the load condition of the diesel particulate filter (DPF). This further increases the exhaust temperature and triggers the regeneration process in
the DPF. The particles in the exhaust are subsequently burnt.
This being the case, I would expect the engine's cooling and lubrication systems to handle the additional heat created by the two post injections as design, the additional heat is designed to pass through the system and create heat in the exhaust components, not in the engine bay.
Typically when my car regenerates the exhaust temperatures will rise to just below 700° C and the dash thermostat may simply rise and fall a few degrees around normal, hardly noticeable! the regen process is designed to be passive, you shouldn't know it's happening!
What you're describing is just very wrong and in your shoes, if you still have the window of opportunity to return the vehicle for a full refund, I would take advantage before it closes, this is a new car!
Its just diesel you trying to start a riotMy wife usually fills up at the local Sainsburys but last time it was Costco - should that make a difference? It's just diesel, no?
Lot of debate about that one but from my personal experience of owning 3 Mercedes diesels I’ve only ever run them on premium fuel and never had any form of DPF issues (not even a warning of having to do a burn run) I have on occasion had to fill up at Sainsbury’s and the car smelt like a dirty old wagon ! I’d certainly give it a try on running on premium fuelMy wife usually fills up at the local Sainsburys but last time it was Costco - should that make a difference? It's just diesel, no?
Yes, I find Esso runs cleaner than BP, can’t comment on ShellLot of debate about that one but from my personal experience of owning 3 Mercedes diesels I’ve only ever run them on premium fuel and never had any form of DPF issues (not even a warning of having to do a burn run) I have on occasion had to fill up at Sainsbury’s and the car smelt like a dirty old wagon ! I’d certainly give it a try on running on premium fuel
Big question is, can I insist it is faulty because it is not completing a regen? Even having 18 and 23 minutes to do so?
Not nesserarily...its not only the time it takes to complete a regen, its also the conditions that needs to be met by the system before it will even attempt a regen. They're a bit unpredictable. You could drive 100 miles, but it might only start to regen at the 95th mile, and then fail to complete as the remaining 5 miles is not enough.with the mileage your doing a regen should be no problem, my 14 plate does the regen in 10mins and always has.
I mainly use shell then BP or Texaco (mine strangely likes the texaco pump)Yes, I find Esso runs cleaner than BP, can’t comment on Shell
I used the local BP station for years with the S210 320cdi and the car ran very well but always needed an Italian tune up every month to shift the soot that accumulated in exhaust system, done when there was no traffic behind as I’m considerate. The filling station then changed to Esso and low and behold no need for an Italian tune-up the car running much cleaner - amazing the difference even in premium fuels.I mainly use shell then BP or Texaco (mine strangely likes the texaco pump)
Must admit the best all found is the shell for me and with the bonus rewards you get on the shell card it makes it as affordable as supermarkets,I used the local BP station for years with the S210 320cdi and the car ran very well but always needed an Italian tune up every month to shift the soot that accumulated in exhaust system, done when there was no traffic behind as I’m considerate. The filling station then changed to Esso and low and behold no need for an Italian tune-up the car running much cleaner - amazing the difference even in premium fuels.
Is that Shell standard diesel or their V Power premium?Must admit the best all found is the shell for me and with the bonus rewards you get on the shell card it makes it as affordable as supermarkets,