Author Topic: Rough running  (Read 698 times)

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  • gb United Kingdom
    Hampshire
Rough running
« February 09, 2018, 18:18:31 »
Hello all. I am  currently running a 2011 I 30 CRDi auto as a taxi. It has covered 180,000 miles and generally runs ok. Had the timing chain done about 5k ago. Since I’ve had the car it sometimes runs really rough. When I pull up at a junction it will sometimes sit there and feel really ‘shuddery’. It also feels like it’s surging when you’re driving along a a set speed. Sometimes 30 sometimes 40 mph. Also every few days it really smells of exhaust inside and outside the car. It often does this in conjunction with the shuddering effect. Our garage mechanics can find nothing wrong with it but then they are useless (we call them clown cars  :lol:). Also the trip computer shows she’s only doing 29mpg. I kno it’s driven in town a lot but does this seem excessive to anyone. Many thanks for any answers in advance.
Tony


  • 2011 1.6crdi auto

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Re: Rough running
« Reply #1 : February 09, 2018, 18:36:11 »
 :welcome: BigTone.

I can recall a similar issue mentioned not that long ago. I can't recall the verdict though. Let's see if some with better memories and /or better diagnostic skills come to the party. If not, I'll have to do some searching.   :cool:
  • MY18 PD SR & 2014 1.6 GDi Tourer (Prev had 2008  i30 CRDi & MY11 Petrol CW)

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  • au Australia
    Samford Valley
Re: Rough running
« Reply #2 : February 10, 2018, 03:01:23 »
:welcome: BigTone.

I can recall a similar issue mentioned not that long ago. .   :cool:

You are doing better than me mate....where am I?   :crazy2:

Quick answer is that the car is over-fuelling. Could be injectors , but more likely a fuel pressure control component on the fuel pump or fuel rail. Also need to check the ECU is still up todate.
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  • dk Denmark
    Sdr. Omme - DK
Re: Rough running
« Reply #3 : February 10, 2018, 03:36:42 »
It's the DPF regenerating, quite normal behaviour..  :P
  • i40 CRDi 100 kW 2013

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  • gb United Kingdom
    Hampshire
Re: Rough running
« Reply #4 : February 10, 2018, 14:36:25 »
Ok. Thanks for those answers. I did think it must be something on the fuel side of things. Re the dpg regenerating. Should it do it that often. I don’t do much more than 500 miles a week and it seems to be doing it far more often than it should. I’ve driven other same model i30s and they didn’t do it. As for the ecu being up to date I don’t hold out much hope of ‘clown cars’  being able to sort that!!
Many thanks
Tony
  • 2011 1.6crdi auto

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Re: Rough running
« Reply #5 : February 10, 2018, 15:36:25 »
Ok. Thanks for those answers. I did think it must be something on the fuel side of things. Re the dpg regenerating. Should it do it that often. I don’t do much more than 500 miles a week and it seems to be doing it far more often than it should. I’ve driven other same model i30s and they didn’t do it. As for the ecu being up to date I don’t hold out much hope of ‘clown cars’  being able to sort that!!
Many thanks
Tony

Only diesel i30's with DPF will do it. Most of us Aussie members can't relate as the i30 diesel only had the DPF added in the latest (PD) model over here.
  • MY18 PD SR & 2014 1.6 GDi Tourer (Prev had 2008  i30 CRDi & MY11 Petrol CW)

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  • dk Denmark
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Re: Rough running
« Reply #6 : February 10, 2018, 16:27:03 »
Ok. Thanks for those answers. I did think it must be something on the fuel side of things. Re the dpg regenerating. Should it do it that often. I don’t do much more than 500 miles a week and it seems to be doing it far more often than it should. I’ve driven other same model i30s and they didn’t do it. As for the ecu being up to date I don’t hold out much hope of ‘clown cars’  being able to sort that!!
Many thanks
Tony

It's not the distance you travel weekly that decides how often it regenerate, it's the amount of soot in the dpf, which again will depend more of the driving pattern than the distance.
If the regeneration doesn't finish when you stop the car, it will try again when the engine next time meet the requirements. That's why you'll find it regenerating more often than you find necessary..  :cool:

Off course there could be a faulty sensor causing the ECU to think the DPF is more clogged than is.
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Re: Rough running
« Reply #7 : February 10, 2018, 16:46:18 »
I don’t do much more than 500 miles a week and it seems to be doing it far more often than it should.

Only diesel i30's with DPF will do it. Most of us Aussie members can't relate as the i30 diesel only had the DPF added in the latest (PD) model over here.

Yes Dazz, cant say I miss DPF either. Mind you if someone was doing 500 miles a week in his diesel past my house, I might find some relief, like a shotgun,. :cool:

Question: @Asterix  or anyone ; Why would the car run rough when it regenerates ? The burn off is ex motor.
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  • dk Denmark
    Sdr. Omme - DK
Re: Rough running
« Reply #8 : February 10, 2018, 18:00:54 »
I don’t do much more than 500 miles a week and it seems to be doing it far more often than it should.

Only diesel i30's with DPF will do it. Most of us Aussie members can't relate as the i30 diesel only had the DPF added in the latest (PD) model over here.

Yes Dazz, cant say I miss DPF either. Mind you if someone was doing 500 miles a week in his diesel past my house, I might find some relief, like a shotgun,. :cool:

Question: @Asterix  or anyone ; Why would the car run rough when it regenerates ? The burn off is ex motor.

I can for sure feel the extra vibrations when regen is ongoing. My guess is that the process restricts the flow in the exhaust.
I don't mind the DPF if that's what it takes to clean the exhaust. I would much prefer to loose the EGR...
  • i40 CRDi 100 kW 2013

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  • au Australia
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Re: Rough running
« Reply #9 : February 10, 2018, 22:03:06 »
Thanks mate, Good point about the EGR , Cheers
  • Every FD model; BMW Z3 M; Mitzi Magna(mobile office)

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  • gb United Kingdom
    Hampshire
Re: Rough running
« Reply #10 : February 11, 2018, 13:33:27 »
Ok thanks all. I will mention the overfuelling suggestion to the garage next time I take it in. There are lots of little problems on the car but I have managed to turn it into a nice little car just apart from the above mentioned problem.
Many thanks
Tony
  • 2011 1.6crdi auto