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Thread: 1.9 CDTi MISFIRE

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    Question 1.9 CDTi MISFIRE

    Hello everyone,
    I've got a 54 1.9 CDTi150 Signum (manual). Whenever i start the car from cold and let it idle for a few seconds it seems to chug a little, almost like a small misfire. It goes very quickly, usually after 10 seconds or so, or if you drive straight off. I think i've read somewhere before that this might be the Injector wiring.
    Anyway, my car has been sat for a week with no use, and when i started it, it was chugging more than usual, and when i drove off it was running on what felt like 3 cylinders with very little power, once i'd driven 50 or so metres it cleared itself with no further problems. No management lights came on or have been on since...
    Does anyone think the injector wiring could be the cause, or just that it's been left for a week..? i always use Shell V power diesel to keep the injectors and such clean....
    Many thanks.. Dave

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    Regular Member vec1975's Avatar
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    I've had similar problems with my 1.9 120.

    I've had the injector loom replaced, 4 injectors replaced, the EGR Valve replaced, a software update and 4 new glow plugs.

    Finally it seems to be running like a dream again! (Apart from a little spilt diesel smoking but been told that will burn off!)

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    Regular Member installer's Avatar
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    Quote Originally Posted by GSiSnash View Post
    Hello everyone,
    I've got a 54 1.9 CDTi150 Signum (manual). Whenever i start the car from cold and let it idle for a few seconds it seems to chug a little, almost like a small misfire. It goes very quickly, usually after 10 seconds or so, or if you drive straight off. I think i've read somewhere before that this might be the Injector wiring.
    Anyway, my car has been sat for a week with no use, and when i started it, it was chugging more than usual, and when i drove off it was running on what felt like 3 cylinders with very little power, once i'd driven 50 or so metres it cleared itself with no further problems. No management lights came on or have been on since...
    Does anyone think the injector wiring could be the cause, or just that it's been left for a week..? i always use Shell V power diesel to keep the injectors and such clean....
    Many thanks.. Dave

    This was the explanation I was told of -

    Bad idle behaviour after cold start at low ambient temperatures.
    Cause: At low ambient temperatures a low battery voltage (<*1*>Due to low voltage the real injection quantity might not follow exactly the desired injection quantity. As soon as the battery voltage exceeds the values of 12 Volt or as the engine warms up (lower injection quantity) the idle speed quality will improve. Low voltage is caused by load response behaviour of the alternator, e.g. alternator need 1200 1/min initially in order to "start working". Once the engine was started and reved up > 1200 1/min the idle speed will stabilize w/o any cut offs. Problem might be reinforced as more electrical devices (auxiliary heater) are equipped to the system

    some peeps have had alternator problems and was a recall/reworking of some but from what I can gather it`s a feature of some cars,been discussed on here before

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    Nice one, thanks very much for the reply...
    Dave

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    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP1

    Engine : 1.9 CDTi 150

    Year : 2007

    Mileage : 66000

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    Quote Originally Posted by installer View Post
    This was the explanation I was told of -

    Bad idle behaviour after cold start at low ambient temperatures.
    Cause: At low ambient temperatures a low battery voltage (<*1*>Due to low voltage the real injection quantity might not follow exactly the desired injection quantity. As soon as the battery voltage exceeds the values of 12 Volt or as the engine warms up (lower injection quantity) the idle speed quality will improve. Low voltage is caused by load response behaviour of the alternator, e.g. alternator need 1200 1/min initially in order to "start working". Once the engine was started and reved up > 1200 1/min the idle speed will stabilize w/o any cut offs. Problem might be reinforced as more electrical devices (auxiliary heater) are equipped to the system

    some peeps have had alternator problems and was a recall/reworking of some but from what I can gather it`s a feature of some cars,been discussed on here before
    Sorry to drag up an old thread, but recently my car has started to misfire for about 10 seconds when starting the car (but the very first start of the day) then it will be as smooth as a babys bum, I did a search and brought up this thread.

    Can anyone back the above comment up, and if so, what would be the more likely cause, the battery or alternator..?

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

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    I can only speak from personal experience with my 1.8 petrol.

    The charging circuit does not need 1200 rpm for it to kick in. After initial startup and idle stabilisation, it starts to charge - after about 3 seconds from first crank.

    I would seriously doubt that injector firing is so adversely affected by low battery voltage - when the same battery has just cranked and started the car.

    My bet would be something with the wiring and connectors - first port of call.


    Starting and charging plots here: http://www.vectra-c.com/forum/showthread.php?t=74787

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    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP1

    Engine : 1.9 CDTi 150

    Year : 2007

    Mileage : 66000

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    Quote Originally Posted by Ste View Post
    I can only speak from personal experience with my 1.8 petrol.

    The charging circuit does not need 1200 rpm for it to kick in. After initial startup and idle stabilisation, it starts to charge - after about 3 seconds from first crank.

    I would seriously doubt that injector firing is so adversely affected by low battery voltage - when the same battery has just cranked and started the car.

    My bet would be something with the wiring and connectors - first port of call.
    Damn it, I've been sussed.

    I have just changed the 3rd injector with the new kit from Vauxhall, but as I have no soldering iron, the wires have been joined by other means

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    Well i must admit that i haven't got the Signum anymore, but the symptom did go away, after of all things - having the inlet manifold replaced.
    The linkage bar had fallen off on those dreaded swirl flaps. When i got the car back it never juddered again, and funny old thing, didn't get any exhaust fumes in the cabin as it used to...
    Not that i would advise to just go and get your manifold changed mind.....!
    Maybe it was a coincidence......

    Good luck..!

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