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Thread: Lumpy Idle + 1Gal/PH

  1. #1
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    Default Lumpy Idle + 1Gal/PH

    Hi guys

    Second Q of the day, sorry to be such a pain!!

    I was coming back home earlier after being out for about 40 minutes in the car and when I stopped at a roundabout I could feel the engine idling 'lumpy', probably more pronounced by the autobox.

    It was quite bad, you could feel the car jolting, and when I parked up outside the house it was really bad in reverse (like you are not giving a petrol enough revs), and when I parked up I saw that the engine was using 1gal/per hour!!

    So I thought (after reading what I had on here) that the DPF could be up to some funny business, so I drove it back out (still lumpy), got to a nice stretch of NSL road and gave it a good old hoof, and after that it stopped?

    Was this the DPF causing this or is something else more sinister going on? No lights came up on the dash at all, and was not down on power...

    Cheers people

    (sorry to be such a pain!)

  2. #2
    Regular Member keefy*2010's Avatar
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    Vehicle : Vectra C Facelift

    Trim : Elite

    Engine : 1.9Cdti 150

    Year : 2007

    Default

    Depends which model you have
    But sounds like like it was re-generating the DPF, classic symptoms for re-gen

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    Sorry keefy forgot to say - 1.9CDTi 150 Auto

    Have checked the number in the box on the chassis and I do have a DPF

    If it is classic DPF regen then I can live with that... thought something had gone wrong at first!!

    Can Tech2 turn the flashing of the glow-plug light back on so I know when it is being an arse?!

    Thanks dude

  4. #4
    Regular Member alanv6's Avatar
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    As yours is an auto it has a DPF, its the classic regen symptoms, nothing to worry about...

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    I was hoping that would be the answer - I had read the fuel economy goes through the floor but was not sure about the lumpy running.

    How often do they usually regen?

  6. #6
    Full Member plasma's Avatar
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    Vehicle : Vectra

    Trim : SRi

    Engine : 150

    Year : 05

    Mileage : 74000

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    lumpy runnign is probably due to the timing being off which is does during a regen.. Something Benny said to me about how it misfires on purpose for some reason...
    Plasma's Tech2 services are now open and able to provide services

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    Was doing some more reading on it here earlier, found out it puts another shot of diesel in on the exhaust stroke, which hits the cat on the DPF and heats it all up.

    Very interesting how it works - but ****** annoying! Wrecked my fuel economy drive

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    Mine did exactly the same the other day. Identical symptoms! Mines also an auto estate 150 cdti.

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    Regular Member Penfold101's Avatar
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    The extra fuel for to burn the soot off the filter is injected AFTER the combustion so it would make sense that the engine wouldn't run completely smooth, although I've never noticed anything major with mine. The extra 2 cylinders might make a difference though...

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    Quote Originally Posted by Penfold101 View Post
    The extra fuel for to burn the soot off the filter is injected AFTER the combustion so it would make sense that the engine wouldn't run completely smooth, although I've never noticed anything major with mine. The extra 2 cylinders might make a difference though...
    Don't rub your 6-cylinderness in my face

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