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Thread: DPF ... What does your car do?

  1. #1
    Regular Member TopRod's Avatar
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    Default DPF ... What does your car do?

    I think I've figured out why my car idle's a bit rough every now and then. When the car gets to full temp every now and then it runs slightly rough almost like its on 3 cylinders for about 15-20 minutes but I spoke to a vauxhall technician and he explained how it works.

    Just want to know what you car acts like when the DPF is re-generating.

    Ta.

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    Vehicle : Vectra

    Trim : Design

    Engine : 1.9CDTi

    Year : 2005

    Mileage : Lots

    Default

    I don't have a DPF but I believe the engine will run rough because the injection time is changed so the fuel burns later than it should when the exhaust valves are slightly open. This causes the heat to build in the exhaust and burn the crap out of the DPF. Your MPG will go riiiiiiight down when it's doing a regen too.

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    Regular Member badback's Avatar
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    I've had my car over 4 years and only noticed a regen once and I'm not 100% about that one. I take the car for a hundred mile run once or twice a week and it must do it's thing then. My exhausts tips are spotlessly clean too. It never kicks any smoke out either.

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    Regular Member DeJohnny's Avatar
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    When idle, its like you can hear the engine rev itself up a bit and fuel usage is way up for a moment

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    Regular Member RobertHayman's Avatar
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    Vehicle : Insignia

    Trim : Elite

    Engine : 2.0 CDTI auto

    Year : 63

    Mileage : 8,500

    Default I have DPF

    58 reg 1.9 cdti 150 auto box.

    Current mileage 32k.

    About 3000 miles between regens, the last 3 times.

    Runs rough on tick over, instant consumption goes up.

    When it occurs I continue to drive around about 10mins, giving it some high revs, then slow down and its finished.

    Have been recording mileage at each regen to monitor it.

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    Regular Member TopRod's Avatar
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    Quote Originally Posted by RobertHayman View Post
    58 reg 1.9 cdti 150 auto box.

    Current mileage 32k.

    About 3000 miles between regens, the last 3 times.

    Runs rough on tick over, instant consumption goes up.

    When it occurs I continue to drive around about 10mins, giving it some high revs, then slow down and its finished.

    Have been recording mileage at each regen to monitor it.
    This is what my car does too and mines a 1.9 (150) auto.

  7. #7
    Regular Member ph67's Avatar
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    I see the following during a DPF regen on my V6 CDTi (Z30DT), probably the same on the 1.9:

    Tickover is rougher, feels like a missing cylinder.

    Fuel consumption on tickover goes from 01. gal/hr to 1.0 gal/hr

    Fuel consumption when driving goes from 60 MPG in 6th at 60mph to about 30 MPG

    Engine water temp. goes up from 85 to 88 or 89

    Throttle not quite as responsive when Turbo is picking up at low revs, once it does pick up it goes liek a rocket

    Regen last about 10-15 mins

    Regen cuts in every 300 to 400 miles

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    Quote Originally Posted by ph67 View Post
    I see the following during a DPF regen on my V6 CDTi (Z30DT), probably the same on the 1.9:

    Tickover is rougher, feels like a missing cylinder.

    Fuel consumption on tickover goes from 01. gal/hr to 1.0 gal/hr

    Fuel consumption when driving goes from 60 MPG in 6th at 60mph to about 30 MPG

    Engine water temp. goes up from 85 to 88 or 89

    Throttle not quite as responsive when Turbo is picking up at low revs, once it does pick up it goes liek a rocket

    Regen last about 10-15 mins

    Regen cuts in every 300 to 400 miles
    Ditto - pretty much to the word. Normally assume 1 regen every tankfull.

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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

    Default

    Quote Originally Posted by snapsnap View Post
    Ditto - pretty much to the word. Normally assume 1 regen every tankfull.

    It ultimately depends on how the car is driven - lots of town driving will mean lower speeds and gears. This is will cause the DPF so soot up quicker. Motorway driving means less soot and hence regen intervals are longer. Regens don't perform at town speeds or idle if they perform at all then.

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    Regular Member badback's Avatar
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    Finally! Since having my car remapped and fitting a pipercross airfilter, along with the twin exhausts, I can now tell when my car's doing a regen. I can hear the exhaust tone go deeper and louder, this prompted me to check the fuel consumption which had increased, and the tick over was rough and slightly faster. I think previous regens were mainly done at 70 mph ish so I couldn't notice them without watching the mpg all the time.

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