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The dreaded DPF

Bagpuss12

By Bagpuss12,
in BMW 3 Series Forum

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Bagpuss12 Newbie

Bagpuss12

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New to BMW’s but not to diesels. Just acquired a 318d that’s clocked over 145k miles however was a company car so FSH and very well looked after. The car is now only used to bob around town and very rarely sees a motorway. The particle filter light has since come on so I went for a 40 mins motorway drive doing a steady 55mph in 5th gear and nothing??? It’s now booked in for a forced regen however I don’t want to have to keep doing that!! How come the motorway drive didn’t do the trick? 

Greydog Grand Master

Greydog

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Posted

Morning Keith

My sons Toyota pickup gets this from time to time the Dealer told him that it needed engine revs at 3k for 15mins minimum to generate the heat required in the DPF. Even in his truck that means 60+ in 3rd gear. The other thing to check is the EGR valve and all it;s pipework.

Dave

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    1. 8

      No boost and strange noise

      Hi Dave I was nervous before about having the DPF tampered with, even more so now. They removed the turbos last week and sent them off for refurb this week while they are on holiday. I'll speak to them on Monday and ask them not to mess with the DPF. I had the EGR and cooler replaced by a main dealer about 2 years / 8k miles ago and that's when the problems with burning oil smell in the cabin started. Last year I read online that a burning oil smell is not uncommon with the N47 due to oil leaks from the valve cover onto the exhaust. It's hard to see the edge of the valve cover because of the vacuum tanks and control devices but I had a look underneath and noticed the DPF was covered in oil. When I hooked up my scanner to bleed the fuel system I noticed codes relating to exhaust temp upstream of the cat. I replaced the sensor and all seemed well, then the EGR air plausibility codes started, then the charging pressure control and then limp mode. I'll make sure I take it for a decent run regularly. If the turbos last another 50,000 miles they'll probably outlive me. Cheers Jim
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      Hi Jim My experience with my own E70 3.0d which I brought very cheap as an MOT fail due to DPF being tampered with. Is the EGR had become clogged and that had caused the same situation as your in, the old owner removed the EGR and DPF then fitted a refurbished Turbo. The MOT fail drove him over the edge and he just wanted rid of the car. I got a used EGR and cooler plus a used DPF from Quarry Motors, had both professionally cleaned then fitted and a little faffing around reprogramming and I have a very cheap E70 3.0sd which has passed 3 MOT's now. For information I brought the E70 as a project and to keep the miles down on my E53 4.6is. Most of my journeys these days are less than 10 or 15 miles but once a week I give it a Motorway run of about 45mins and so far so good. As said if an MOT Station suspect the car has been tampered with it's a fail. As your DPF has been regenerating personally I would keep it Good luck Dave
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