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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > DPF help



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      03-06-2013, 04:09 PM   #45
HighlandPete
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Originally Posted by Frobius View Post
My car generally gets to about 78. Have to really try to get it to go any higher. Wonder if I need to do stats. Had anyone actually checked the TIS to see what BMW say the norm shold be? The F11 520d loaner I had yesterday sat at 100 deg rock solid.
As said above, you should be seeing 88 - 92C range in normal running conditions. Main thermostat is rated at 88C, opening temperature. EGR thermostat messes with the ECT when it has failed, even if the main 'stat is somewhere in range.

BTW, you shouldn't need to "try to get it higher", it will just go there if working correctly, as you continue driving.

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      03-06-2013, 05:25 PM   #46
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thanks for the input all, it has been very useful. I'm getting the thermostats replaced tomorrow. The garage have advised me they will put the car's computer in "forced regeneration" mode and then I should take the car for a 30 min to 1 hour drive at a steady 70mph and this will hopefully initiate the regen process. Does this sound right?

Secondly, how does the regen process work, my understanding is that you once the error codes are cleared, the computer will allow the regen process to be started, is this correct?

Reason for asking is that I am due to collect the car tomorrow afternoon around 6pm and the roads will be quite busy at that time so it is unlikely I will be able to maintain the speeds required for the regen process to initiate. I was thinking of taking the car home first and taking the car for its 1hr drive when the roads are quieter. Will doing this switch the "forced regen" mode off?

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      03-06-2013, 05:47 PM   #47
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The car will do it on its own as soon as the parameters are met.

If changing your thermostats make it meet the parameters then it will do it without a forced regeneration (if it needs to)

If it was me I'd drive home.. The set off out at 8ish when the roads have gone quiet for an hour. You don't need to be sat on the motorway just get on some open flowing roads. Just drive normal - no giving it death everywhere. You'll know straight away when the process has started.
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      03-06-2013, 06:40 PM   #48
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thanks makes sense, agreed no need to thrash it, sounds a bit of a ridiculous design function that the DPF will only regen at high speeds/revs (as many others on the net have suggested).

Forgot to mention the garage have told me it is going to cost 210 including VAT for the diagnosis, parts (x2 thermostats) & labour. Is that reasonable?
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      03-07-2013, 12:55 AM   #49
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That does sound a good price to be fair. I'd be happy with that.
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      03-12-2013, 08:56 AM   #50
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thanks all for the input, it was very helpful. Engine is now running at 88 to 92 and the dreaded DPF light has disappeared for the meantime.

The indy garage advised me that they have put the car's computer in forced regen mode and it should "hopefully" regen itself. Whether it has or has not performed a forced regen I am unsure, I took the car for a 60 mile drive and all seemed ok, c.50 mpg and the car at aroun 90*C.

I took my car to Bexley Motorsport and they were very helpful and would definitely recommend them.
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      03-12-2013, 10:42 AM   #51
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Since I replaced the thermostats in mine I have noticed that it has even regened just driving around town.
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      03-17-2013, 01:50 PM   #52
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Hi all, a very unhappy first post from me...

DPF light came on yesterday. I have access to a lead and the software required to read and reset the codes, but to be honest I don't know what I am looking at, or even if I am using the right version.
I have a 2007 e91 325D which I assume is the M57N2 engine but if I select M57 of any type it won't connect.
Any ideas?
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      03-17-2013, 02:05 PM   #53
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Originally Posted by ssc330d View Post
Since I replaced the thermostats in mine I have noticed that it has even regened just driving around town.
and me.. no way you need to pay for these forced regens.

if it needs to regen it will do in any sort of normal driving as long as the temps are correct - specially coolant.

don't need to be sat at a constant speed or anything.

my first regen (after changing stats) lasted ages and absolutley stunk. I've only had one more since and it only lasted about 5 minutes.
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      03-17-2013, 02:36 PM   #54
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[quote=Uk 330d;13217958]so my 1st port of call should be getting the thermostats changed by the sound of it, I'm under the impression the temp gauge is in a hidden menu, could someone please let me know how to get the temp gauge up so I can check what temps my car is running at please.[/QUOTE

If you have an android phone I would invest in the Torque Pro app (<10) and a bluetooth OBD2 dongle from Amazon (about 25) and then you can read temp continuously, read many other variables (ie turbo boost), read and clear many codes (not all). It will works on most modern cars with a OBD2 socket and so becomes a handy diagnostic tool.
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      03-17-2013, 06:53 PM   #55
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Originally Posted by PhilM View Post
and me.. no way you need to pay for these forced regens.

if it needs to regen it will do in any sort of normal driving as long as the temps are correct - specially coolant.

don't need to be sat at a constant speed or anything.

my first regen (after changing stats) lasted ages and absolutley stunk. I've only had one more since and it only lasted about 5 minutes.
interesting point on paying for the forced regen, another "reputable" indy BMW specialist garage were quoting me 150 for the forced regeneration... that's when I decided to take the car elsewhere.

Does this mean the DPF will regenerate once the correct engine parameters are met even if the DPF warning light flashes up on the iDrive system? From reading previous threads on this form, the general consensus was that it would not!
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      03-18-2013, 03:43 AM   #56
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I couldn't answer if that's the case if the warning light is on.

Mine never has been. I'm hoping I've saved it in time by doing the stats.

Ill look further when I get chance. But surely if the code is cleared and the parameters are met it should regenerate. I don't understand why it would need to be forced.
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      03-18-2013, 06:07 PM   #57
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New owner here. Excuse my ignorance but does the 600-700 dpf/remap price from companies entail just a flash of the ecu for new dpf settings or does the map mean performance gains too. I own a '57 325d.

So basically for the price above, I can have my dpf removed and drive away with circa 240ish hp?

Again, sorry if this questions been covered.
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      03-19-2013, 06:25 PM   #58
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sooo looking for further advice on the DPF issue. its been about 500 miles since i had the new Themrostats put in and car seemed fine. unfortunately that damn DPF light came back this evening!! everything has seemed fine with the car since last week, i.e. no loss in power and good mpg and the garage last week told me the back pressure readings at the various revs looked ok, so not sure what it now could be.

an fyi, the car has done a 100k miles.

Any tips advice on what I should do next...could it be a sensor issue....or is it more than likely to be the damn DPF that needs to be got rid off...

thanks
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      03-19-2013, 06:43 PM   #59
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There is no way around this you need to read the codes. Car will not regen if you see 480A particle filter bank1. Lots has been written previously. I would say exhaust pressure readings cannot be OK. When clean its 6mb off top of my head.
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      03-20-2013, 03:58 AM   #60
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How can you see when driving if the DPF is going through a regen?

Thanks.
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      03-22-2013, 06:36 AM   #61
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Thanks Ade, I mentioned your advice re. no regen if error codes are present, however the chap at the garage said it should regen as long as regen parameters are met. Apparently, back pressure readings are fine at low revs, but they only fail the "back pressure" test at mid to high revs. He never mentioned what error code was present, i.e. the 480a code you mention.

I am due to complete a drive 1k miles in the next couple of weeks so I thought I will wait and see how the car is after that! Is that advisable?

Secondly, probably a question that has been covered before but i can't see a response...the MOT is due next week, if the warning light appears during the MOT does that mean the car will fail the MOT?

Thanks
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      11-17-2013, 02:47 PM   #62
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