Thread: D.P.F.'s?....Has anyone had a problem?

Do a search on YouTube with "youtube autoexpert dpf"

Originally Posted by p38arover

Do a search on YouTube with "youtube autoexpert dpf"

I could not stomach another minute listening to that bloke!

Originally Posted by Lionel

I suggested a good thrash along the motorway for 20 miles or so once a month,
Cheers, Lionel

i adopt that logic most nights with a 8200 rpm redline blat though each gear before the road starts to get light under the car. The dealer mechanic said to give it the berries to clean out the intake manifold, told him that i'm happy to oblige that instruction. As for the defender, the cat and most other pollution stuff fell off mysteriously

Someone started a similar thread and there was a good bit of information regarding DPF's. Short of it is they're great in theory but the application for most cars is not ideal, with some causing major issues.

Basically it came down to the DPF being too far away from the turbo, meaning it is much colder, and uses a lot of excess fuel to burn the particles up. There are 2 ways of doing this: 1) install an extra fuel injector just before the dpf or 2) pump extra fuel into the engine with the intention of it passing unburnt into the exhaust. (The second is the cause of fuel in the oil in some of the ingenium diesels.)

The most successful (read least troublesome) designs have the dpf as close to the turbo as possible, with a separate injector where necessary. As the exhaust after the turbo is frequently above 4-500°C the additional injector doesn't have to be used very often, as the dpf will be cleaned during hard acceleration, when exhaust temperatures jump towards that 750° magic number.

Apparently the dpf in the D5 is a fair way away from the turbo, as it has a catalytic converter in there too.

At least, that's how I've understood it