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Thread: 3.0cdti engine cutting out

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    New Member edwardjames's Avatar
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    Default 3.0cdti engine cutting out

    Hi Everyone,
    I have just joined the forum as I have been searching for info re a problem with my Vectra 3.0cdti SRI.
    The car is a 06 plate and has done 95000 miles and is a joy to drive but for some reason it seems to have developed a fault that seems to be getting worse.
    When the car is idling it starts to run a little bit lumpy then cuts out. At first it did this very rarely so I didnít worry and also it just fired up straight away, but recently it seems to be happening more often and now itís a lot harder to re-start. I have changed the fuel filter which may have helped a little but I canít be sure.
    I have been told it could be the scv valve but from what Iíve read the problems occur at higher revs when this is faulty. I have also read that there is a software issue and this can be updated?
    Can anybody out there give me any advice?
    Thanks,
    James

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    Regular Member m8internet's Avatar
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    A blocked SCV will only occur when the engine is under load and not on idling, so it isn't that

    The issue sounds more like fuel starvation, so arrange for the fuel sytsem pressures to be examined

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    New Member edwardjames's Avatar
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    Tanks for the reply and advice!

    Can the fuel pressure be tested with diagnostics or is it a physical test?

    Thanks, James

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    Regular Member Critch's Avatar
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    It can be checked with diagnostics

    But before you do anything. Undo the little screw on top of fuel filter an fill the filter housing by hand until diesel poors out. See if that helps at all.

    Does it cut out Whilst driving?

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    New Member edwardjames's Avatar
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    Hi Thanks for the advice.

    I will give this a try and it only cuts out whilst ticking over?

    Thanks,

    James

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    Regular Member Critch's Avatar
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    Not sure if these have one but possibly a faulty idle control if it has 1?

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    I have had fuel starvation issues with this engine due to a leak allowing air into the fuel system. This presented as progressive loss of power under load (but starting and idle was fine). Corrected temporarily by topping up the fuel filter.

    Seems like slightly different symptoms, IMO. However, it is worth doing as Critch suggests, just to see if it's an easily identifiable problem.

    Best to try and get it on a diagnostic m8. Does it run A-OK under load? Fuel starvation should worsen as you ask for more fuel...

    Anyone know what the symptoms of dodgy crank / cam position sensors are and whether this would be relevent???

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    Regular Member Critch's Avatar
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    ^^ good point could be but I'd of thought with them you'd also have problems driving

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    New Member edwardjames's Avatar
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    Hi Guys,

    Thanks again for your replys.

    The fault only seems to occur when idling and when driving there seems to be no issues.

    I am going to ask for a diagnostic test and I will try topping up the fuel filter and driving around for a while.

    If you can make any other suggestions they would be very much appreciated.

    Thanks agani for all your help!

    James

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    Quote Originally Posted by CritchvxD View Post
    ^^ good point could be but I'd of thought with them you'd also have problems driving
    I don't know mate. TBH, I was hoping someone with experience of these items failing might be able to add a little. I do know that modern diesels actually adjust the injection quantities per cylinder to keep the crank speed as constant as possible (over a short period), to keep vibration down. I'm talking about one or two revolutions of the crank, not "RPM". This information must come from the cam position sensor, and I know others have had bad idle probs with a shot sensor, so it was a bit of a leap of faith

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