Domes latest millstone-E65 BMW 730d dpf troubleshooting

[SiC]

https://amzn.eu/d/5aJNPUl

I mean surely this is worth a shot at under 30 quid?

Also heard brick acid is pretty effective too. 

[dome]

7 hours ago, SiC said:

Pouring in some DPF cleaner or even sending it off to be cleaned is probably going to be cheaper than a replacement or mapping it out?

Also I'm biased as I've cycled behind enough gutted diesels and it's fucking grim to be behind one. Invariably because they also have some other preexisting emissions problem which caused the owner to gut it. Thankfully doesn't really happen now with the Bristol CAZ as post 2015 diesels struggle to get past even the MOT smoke test with a gutted filter. 

I suspect this would take some cleaning, 200mb back pressure at idle compared to a healthy one (my old 530d in fact) which has 9mb😳 

Mine as was.

A healthy one. 

A cheap pattern one is £200, a bypass pipe is about the same but would be an MOT fail as it's in plain sight. 

[SiC]

2 minutes ago, dome said:

I suspect this would take some cleaning, 200mb back pressure at idle compared to a healthy one (my old 530d in fact) which has 9mb😳 

This chap in his review of that Wynn's off car dpf cleaner reckoned his vehicle was at 100kpa (1000mbar) back pressure

 

The other key thing is to fix the error codes (possibly thermostat too) so it can regen in the future. 

[SiC]

4 minutes ago, dome said:

A cheap pattern one is £200, a bypass pipe is about the same but would be an MOT fail as it's in plain sight. 

I dunno about DPFs but I know cheap pattern cats are invariably shite. Probably not worth spending out for a bypass when it could be cut open and welded back up from the top side. Or chisel down the middle. 

I can't imagine professional DPF cleaning is that special a process nor that special chemicals. I wouldn't be surprised if that Wynn's fluid is probably pretty much the same as they use just being forced through to speed the process up and then baked so you don't get plumes of smoke when the customer drives off for the first time. They get cleaned all the time, especially on lorries where a DPF is much more expensive but also easier to access. 

[EyesWeldedShut]

I'm with @SiC on the gutted DPFs - not as a cyclist but as a second/third owner - there's (rarely) any idea that a car has been remapped when you buy it and, currently, I'm into the third poor man's BMW (Bini) with a weird remap and/or EGR delete/ DPF gutted. Pulling the exhaust off and shoving and endoscope up a HDi Cat system is fun*.
It kind of sounds like this one is still on the standard mapping so - I'd just go for a cheap DPF and hope that lasts as long as I want to keep the car - these are £140 quid now on the 2008 Binis, £200 on this BMW. Guess what I'm about to splurge on?