DPF Troubles - break, sell or fix?

DPF Troubles - break, sell or fix?

Author
Discussion

eltax91

Original Poster:

9,842 posts

205 months

Thursday 22nd September 2011
quotequote all
HellDiver said:
Except our local guys specifically say they do it on Mazdas. A few of the local cabbies have had it done, no problems.

You're not asking the right mappers.
Don't suppose you could pm me some more details, could you?

windy1

393 posts

250 months

Thursday 22nd September 2011
quotequote all
Get the pipes on the DPF that go to the pressure sensors cleaned of carbon deposits. If they are blocked the sensors will read incorrectly and force the regen mode to activate a lot. Its only a matter of some basic maintenance i.e cleaning to fix the problem.

MattOz

3,910 posts

263 months

Thursday 22nd September 2011
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liner33 said:
First post he had it cleaned , it didnt work
What? With the appropriate DPF cleaner that the company I referred to uses? Must've missed that bit. wink It may have been the same stuff, but maybe not. Worth trying again if it's particularly coked up.

HellDiver

5,708 posts

181 months

Friday 23rd September 2011
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eltax91 said:
Don't suppose you could pm me some more details, could you?
I could if you want, but Ballymena in N. Ireland is probably a bit too far for you to go.

HellDiver

5,708 posts

181 months

Friday 23rd September 2011
quotequote all
MattOz said:
What? With the appropriate DPF cleaner that the company I referred to uses? Must've missed that bit. wink It may have been the same stuff, but maybe not. Worth trying again if it's particularly coked up.
That only cures a symptom, not the problem. It's like cutting off a hand to cure the symptoms of a heart attack.

windy1

393 posts

250 months

Friday 23rd September 2011
quotequote all
Cleaning the brick does not necessarily get the pipes clean.
Once the whole assembly is clean you'll have to change your driving style.
Long motorway trips with plenty of peak torque revs under load and a tank of BG244 every 6 months should help.

eltax91

Original Poster:

9,842 posts

205 months

Saturday 24th September 2011
quotequote all
So all. It's looking like I'm going to have to sell it as broken. The fix is looking like it will cost too much. frown

Anyone want to hazard a guess how much I'll get back for the old shed with a flashing DPF light?

johnpeat

5,326 posts

264 months

Saturday 24th September 2011
quotequote all
eltax91 said:
So all. It's looking like I'm going to have to sell it as broken. The fix is looking like it will cost too much. frown

Anyone want to hazard a guess how much I'll get back for the old shed with a flashing DPF light?
I didn't tell you this because it's not possible to reset the DPF and disable it from recurring - that's something you cannot have done by anyone who has access to half-decent diagnostic kit...

That's definately NOT something you'd want to do

It's also probably been mentioned, but the DPF warning tells you there's a problem with the DPF but the thing is - that's like telling you that there's oil pouring out of the exhaust. The problem isn't that - it's where the oil is coming from - e.g. a knackered turbo most likely??

BigTom85

1,927 posts

170 months

Monday 26th September 2011
quotequote all
These Mazdas inject extra diesel into the cylinders after the ignition stroke which then ignites in the DPF.

For whatever reason, if the DPF cannot regen or the engine is turned off during a regen (quite feasible as it can take up to half an hour!) then the extra diesel is dumped into the sump. Hence these Mazdas have an "X" on the dipstick about an inch ABOVE the full mark, when the oil gets to this level it needs draining out and changing.

I'm not sure on the lubrication properties of diesel, but I'm fairly certain they aren't a patch on the Dexellia 5w30 fully synthetic they charge you for at a service.

If you don't notice the oil level rising it can find itself making its way into the cylinders, allowing the engine to rev out beyond the rev line only stopping when it explodes.

What an excellent design!!

v8guinness

204 posts

280 months

Monday 26th September 2011
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From the OP
eltax91 said:
The fault codes are reading as o2 and dpf temperature sensor faults.
Presumably these sensors (Lambda/Hego & Exhaust Gas Temp) have actually been checked, wiring, connectors and actual sensors, it could just be that the diagnostic fault codes are trying to identify a specific fault. Errors with these would leave the car struggling to regen.

It's not usually necessary to change the oil every time a regen is triggered by a Service tool, but if there have been regen issues it would be very prudent to change the oil!

eltax91

Original Poster:

9,842 posts

205 months

Tuesday 27th September 2011
quotequote all
v8guinness said:
Presumably these sensors (Lambda/Hego & Exhaust Gas Temp) have actually been checked, wiring, connectors and actual sensors, it could just be that the diagnostic fault codes are trying to identify a specific fault. Errors with these would leave the car struggling to regen.

It's not usually necessary to change the oil every time a regen is triggered by a Service tool, but if there have been regen issues it would be very prudent to change the oil!
The garage is going to test the centres this week and see if they need replacing. So I maybe out of the woods with a working car.

I would be interested to know more about how I might NOT be able to delete the warnings using diagnostics kit, if anyone know more detail. wink

gtamax

5 posts

135 months

Sunday 23rd December 2012
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windy1 said:
Get the pipes on the DPF that go to the pressure sensors cleaned of carbon deposits. If they are blocked the sensors will read incorrectly and force the regen mode to activate a lot. Its only a matter of some basic maintenance i.e cleaning to fix the problem.
Yes have a possible fix for symptoms these videos!!

Very informative material was found here on a fix
some variations to parameters but basically the same procedure for other manufacturers that have DPF filters fitted with pressure sensors

DPF FIX PART 1 http://www.youtube.com/watch?v=QMf4m946aKA

DPF FIX PART 2 http://www.youtube.com/watch?v=TXLZEG6It8o

nottyash

4,670 posts

194 months

Sunday 23rd December 2012
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Dog Star said:
Not helpful to you, OP, but this is ridiculous and as good a reason as any to avoid a modern diesel. frown
Its people who dont do the milage that causes problems. So buying one if you drive 3 miles to work is just plain stupid.
I dont have any problems doing 40 miles a day.

eltax91

Original Poster:

9,842 posts

205 months

Monday 24th December 2012
quotequote all
nottyash said:
Its people who dont do the milage that causes problems. So buying one if you drive 3 miles to work is just plain stupid.
I dont have any problems doing 40 miles a day.
And I was doing 100 miles a day when I owned the car that started this thread, the dpf was still st....

jbi

12,668 posts

203 months

Monday 24th December 2012
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Will never own a modern diesel.... EVER

Sorry to hear it OP

Adam-b

58 posts

179 months

Monday 24th December 2012
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The company I work for offer Mazda DPF removal and software fix for just £299, takes 4 hours and unlike many amateur DPF removal options it needs no plug in boxes or emulators, all re-calibrated via the software.

liner33

10,642 posts

201 months

Monday 24th December 2012
quotequote all
jbi said:
Will never own a modern diesel.... EVER

Sorry to hear it OP
You will probably have to eventually , Ive done over 130k in dpf equipped diesels in the last 5 years without significant issue , if it did fail I'd remove it , no more of an issue than a dual mass flywheel imo

jbi

12,668 posts

203 months

Monday 24th December 2012
quotequote all
liner33 said:
jbi said:
Will never own a modern diesel.... EVER

Sorry to hear it OP
You will probably have to eventually , Ive done over 130k in dpf equipped diesels in the last 5 years without significant issue , if it did fail I'd remove it , no more of an issue than a dual mass flywheel imo
nope.. i'm a total luddite

Happy with the ancient indirect injection diesel in the land rover and will just keep rebuilding it when it wears out.

As for my car... petrol suits me fine thanks smile

Flying machine

1,132 posts

175 months

Monday 24th December 2012
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liner33 said:
Stuart J said:
Ive heard rumour that visual inspection for DPF's on cars that should have them will form part of the MOT shortly, Anyone removing the DPf & fitting a by pass pipe ought to check this.
More than a rumour , cats are required irrespective of emissions next year with dpf's added some time later , although i expect those with "gutted" dpfs will be ok
Where did that come from? Any government website links?

I've got a 123d daily and if the dpf gave issues I'd get it removed and the car remapped, but may do that anyway. Is this dpf mot thingy rumour similar to the aftermarket hid 'law'? Certainly a lot about if they should be failing mot's

Flying machine

1,132 posts

175 months

Monday 24th December 2012
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Out of interest is the diesel mazda 6 particularly bad for dpf issues? My brother in law has one and is having this problem