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chicaneuk

Tackling a blocked DPF.. (520d)

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OK! Update! Got the new Euro Car Parts DPF in today and took it round the block. A mixed bag of results. Car does pick up better clearly and watching the back pressure readings on Carly, it's clear it's not blocked any more as the value only changed small amounts under acceleration. However it's evident there is still a massive boost leak somewhere (which was the original manifestation of the problem before I began to realise the DPF was blocked up) as under any real acceleration it sounds like an extremely angry snake HISSING away under the bonnet. I'd taken it to a BMW "specialist" nearby some weeks back and they'd said they couldn't find any obvious signs but.. having come back home and stuck my head under the bonnet and just checked up and down the pipes coming from the intercooler just now, it was blindingly obvious that the 'plug' where the air intake temperature connects to, was blown open and flapping around (presumably because of the back pressure being generated from the blocked particulate filter) so is letting out a tonne of boost-air. 

 

So now I need to order a new / replacement one of those! How did a 'specialist' miss that and I spotted it within 30 seconds?! And I'm pretty clueless at the best of times. Sheesh. 

 

It also still shows high readings for soot/ash on the DPF presumably as it thinks I still have the old one installed. Is it possible to reset that with DIS57 to tell the car a new one has been installed? Doesn't seem it can be done with Carly. 

Edited by chicaneuk

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OK.. just been out to the car with a roll of duct tape just to test lashing that sensor “bung” to the boost pipe and sure enough a quick run round the block and she is going like a stabbed rat again! Woohoo. So just got to either replace that pipe or maybe I will try a repair with some epoxy first… second hand costs START at 50 quid and go up to over 100 and new BMW price looks to be over 300 quid. For a sodding plastic boost pipe. Utter piss take. 

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3 hours ago, chicaneuk said:

It also still shows high readings for soot/ash on the DPF presumably as it thinks I still have the old one installed. Is it possible to reset that with DIS57 to tell the car a new one has been installed? Doesn't seem it can be done with Carly. 

 

I know the DPF mileage can be reset in ISTA D and I'd be confident DIS could do it too.

 

Keliuss

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13 hours ago, chicaneuk said:

OK.. just been out to the car with a roll of duct tape just to test lashing that sensor “bung” to the boost pipe and sure enough a quick run round the block and she is going like a stabbed rat again! Woohoo. So just got to either replace that pipe or maybe I will try a repair with some epoxy first… second hand costs START at 50 quid and go up to over 100 and new BMW price looks to be over 300 quid. For a sodding plastic boost pipe. Utter piss take. 

There may be silicone alternatives available. Worth a look on ebay and some specialist websites before committing to a new/used genuine part.

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OK I found an old post from @Clavurion (and honestly, what a hero you are.. you helped me loads with resurrecting my Webasto heater on my E39 a few years ago and your help was absolutely invaluable!) from a few years back, about the process of resetting the DPF stored values within DIS, which I followed.. having never used DIS before, honestly, what a hideous beast that is... but it tells me it reset adaption values successfully, but I ran out of time over lunch, so will hook Carly up a little later on and see if the ash/soot mass values are all reset as they should now be seeing as it's a completely new DPF installed.

Edited by chicaneuk

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2 hours ago, reggie59 said:

A dfp blocked is just a symptom. If the car is running well, the dpf will go for ever.

 

Mine stopped at 175k miles due to shot glow plugs.

 

Specialist bmw garage was brilliant. First, ran diagnostic then fixed the glow plugs... then forced a regen... car been fine since ( now 190k miles).

@reggie59, don't mean to sound aggressive but read all the post.

chicaneuk took his off to try cleaning it out, turned his back & it was nicked by some thieving scumbags that should have their hands chopped off :angry:

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Thanks for trying to help out at least! :)

 

I have scanned and rescanned the car since.. there's no sign of additional faults that should stop the DPF from regenerating again - glow plugs are fine, and coolant temperature gets up to the right level during a drive. I can only assume I'd done so many short trips over the last year during lockdown I guess it got so blocked up it just couldn't regen itself. I'd tried a fuel additive and tried several long drives with repeated forced regenerations without success always throwing faults to do with the particulate system so can only assume it got stuck in a bit of a viscious cycle, and as said above, I ultimately removed it to try clean it and start over but it got stolen off my driveway midway through the job, can you believe.

 

What's odd to me is that the DPF can get to that level of blockage and the car running so badly, yet it still doesn't throw any warning on the dashboard at all about reduced performance or anything.

 

The only persistant issue I have currently is the boost pipe on the right hand side of the engine (as you look at it from the front) that runs up from the intercooler up to the throttle body, where the air temperature sensor is plugged in, is leaking loads of boost so it's still running like crap. I tried a repair yesterday with some epoxy and a cable tie and it's still leaking this morning on a test drive so clearly going to need to just replace the damn pipe.

Edited by chicaneuk

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On 16/05/2021 at 09:29, chicaneuk said:

Thanks for trying to help out at least! :)

 

I have scanned and rescanned the car since.. there's no sign of additional faults that should stop the DPF from regenerating again - glow plugs are fine, and coolant temperature gets up to the right level during a drive. I can only assume I'd done so many short trips over the last year during lockdown I guess it got so blocked up it just couldn't regen itself. I'd tried a fuel additive and tried several long drives with repeated forced regenerations without success always throwing faults to do with the particulate system so can only assume it got stuck in a bit of a viscious cycle, and as said above, I ultimately removed it to try clean it and start over but it got stolen off my driveway midway through the job, can you believe.

 

What's odd to me is that the DPF can get to that level of blockage and the car running so badly, yet it still doesn't throw any warning on the dashboard at all about reduced performance or anything.

 

The only persistant issue I have currently is the boost pipe on the right hand side of the engine (as you look at it from the front) that runs up from the intercooler up to the throttle body, where the air temperature sensor is plugged in, is leaking loads of boost so it's still running like crap. I tried a repair yesterday with some epoxy and a cable tie and it's still leaking this morning on a test drive so clearly going to need to just replace the damn pipe.

Mine had a warning with stop driving and go and get ripped off but an official stealer.

 

But I remember thinking, how daft this is. The computer decides not to do regen because the glow plugs are shot... does not say anything until dpf is blocked

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Glow plugs not working DO NOT stop the dpf regenerating, they just cause it to block up a bit quicker due to cold starts / unburnt fuel ect.

Faulty stats do, if the car doesn't get up to 85° then it won't regenerate & because BMW in there infinite

wisdom didn't fit a permanent temp gauge unaware owners drive around  blissfully unaware :wacko:

Until your i-drive messages / warnings.  

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Replaced the leaking boost pipe today and back to what feels like full performance and driving nicely again. Hurrah.

 

So one residual issue is that since having had the exhaust off the car, there’s an awful lot of vibration in the cabin at idle yet it didn’t seem like there was an awful lot of adjustment on the exhaust when reinstalling. But I think I will try find some time to run it to an exhaust place and let them have a poke on the ramps and see if they can improve it somehow. 

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15 hours ago, dirtydirtydiesel said:

Glow plugs not working DO NOT stop the dpf regenerating, they just cause it to block up a bit quicker due to cold starts / unburnt fuel ect.

Faulty stats do, if the car doesn't get up to 85° then it won't regenerate & because BMW in there infinite

wisdom didn't fit a permanent temp gauge unaware owners drive around  blissfully unaware :wacko:

Until your i-drive messages / warnings.  

No they do. I cannot remember the exact number but it will not do any regen if 4/6 or 5/6 are shot. 100% sure. Faulty stats too, I agree and i think you also need enough diesel left.

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Quote

The following conditions must be fulfilled for a regeneration:

  • The coolant temperature must be in excess of 75 °C
  • the exhaust-gas temperature before the diesel particle filter must be greater than 240 °C
  • there must be enough fuel (fuel reserve indicator light is not lit up). Whenever the reserve lamp lights up, the regeneration process is suspended.
  • no fault codes from the air mass system, exhaust emission system and sensors must be saved in the DDE
  • The fault codes 480A / 245700 (from F01) and 481A / 245800 (from F01) must display the status "currently not present"
  • Constant driving speed above about 60 km/h (approx. 38 mph). The optimum speed is about 100 km/h (approx. 60 mph).

 

 

https://www.newtis.info/tisv2/a/en/e61-530d-tou/wiring-functional-info/power-train/digital-diesel-electronics2/particulate-filter-system/EZjPC6cq

 

Says 'sensors' but I think a lot of people are getting regeneration with some glow plug errors, not sure how a higher quantity affects it though.

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On 20/05/2021 at 15:12, reggie59 said:

No they do. I cannot remember the exact number but it will not do any regen if 4/6 or 5/6 are shot. 100% sure. Faulty stats too, I agree and i think you also need enough diesel left.

 

Not on the pre-LCI 525d they don't. I had 4 dead as well as the controller and it still tried.

Best road near me is far enough away that I can get coolant to operating temp and then it becomes a gentle uphill for half a mile. That was perfect to get it going if it needed to. Mine is now gutted so I don't have any of these worries anymore.

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23 hours ago, chicaneuk said:

How do you get through the MOT? Friendly tester or are emissions good enough that they can't tell?

How do you mean how do you get it though an mot ?

Yours will be zero issue.

Mine has been tampered with by a previous owner, after two years I am convinced that the dpf has been "fixed"

due to the black sooty tailpipes but zero issues with the mot & no "friendly tester used"

 

Lot's of the 535d & 530d boy's have 3" or 3.5" turbo back straight pipes (no silencers)

EGR, DPF & Swirl flaps gone re-mapped for more power / no warning lights & minimum smoke 

Zero issues with mot, most of what I've said above is hidden under covers & the testers aren't allowed

to remove covers (they can't even remove a child seat to check for seatbelt operation)

They just put down an advisory for tbe belt not being checked.

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