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DPF and smoke issues

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Old Dec 13th, 2018, 21:40   #11
harveys
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No noticeable oil loss. Was serviced when I had it where it was around 3/4 on the dipstick and is still there now. I read somewhere if it was valve stem seals it would blow smoke on starting the engine which it doesn't. Is that the case?
Blue smoke is oil getting burned, black smoke is fuel too much getting burnt.
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Old Dec 13th, 2018, 21:54   #12
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Blue smoke is oil getting burned, black smoke is fuel too much getting burnt.
If it's a petrol engine.
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Old Dec 14th, 2018, 12:55   #13
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Actually the heat required for DPF regen is generated by fuel being released into the exhaust when the ECU decides that a regen is required? You would be unlikely to ever reach the required temperatures by simply driving hard!
4


You have a DPF and it's catching the excess smoke! And that's why it needs frequent regens. You need to determine why... if you've ruled out engine oil burning then you're left with low boost or over-fuelling injector(s). I suggest having engine diagnostic routines performed by a diesel specialist with the appropriate Volvo equipment.
Many thanks for this, I was thinking along those lines having wirnessed the smoke.

So its been into the garage this morning and they say the dpf is completely clogged and as a result is ruined. They say this is the cause of the smoke as its all the crud burning out when it gets hot and have therefore elected to fit a brand new dpf with pressure sensor.

However, like Zebster I can't help feeling the smoke is something more serious and thats why the dpf is getting clogged to begin with, but having not known if its just been a city runabout until now and that's whats causing it we are yet to see. I guess they're the experts.

Fingers crossed, will keep you updated!
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Old Dec 29th, 2018, 09:05   #14
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So a quick update on this, car is back with a brand new dpf and sensor. So far so good! Not a hint of smoke when cold or hot. The oil level had however risen and the warning messege came on to tell me (not sure why), but drained a bit out so its back on 3/4 and all has been well since, not used or gained any. Now to enjoy the car! Thanks for all the suggestions.
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Old Jan 22nd, 2020, 17:00   #15
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So a quick update on this, car is back with a brand new dpf and sensor. So far so good! Not a hint of smoke when cold or hot. The oil level had however risen and the warning messege came on to tell me (not sure why), but drained a bit out so its back on 3/4 and all has been well since, not used or gained any. Now to enjoy the car! Thanks for all the suggestions.
Just wondering if this cured your car for good?

I'm having the exact same symptoms, although more a grey/blue smoke that smells very bad. It happens after overrun, and setting off after sitting idle in traffic.

Don't fancy having to replace the DPF.... Had two regens in two weeks. Car appears to be behaving itself on the soot filter full/Limp mode for the moment, although its only been 5 days since the regen. Still smoking so I imagine its only a matter of time before it happens again.

Cheers

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