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Thread: Running problems with a 2.0 DTi

  1. #1
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    Unhappy Running problems with a 2.0 DTi

    Hi all,

    I apologise that my first post here is just request for information, but my new Vectra C is driving me to drink.

    I bought an 04' 2.0DTi estate a couple of weeks ago now and apart from this intermittent running issue she's lovely (I had a '96 Vectra B estate before this).

    It's an unusual problem in that I'm certain it only occurs when the engine is warm. When you start the car (when warm) she'll sit there hunting for idle. The revs will drop and and then climb again, over and over. This is almost rhythmic, dropping to about 400-500RPM and then up 1200-1300.

    On some occasions, this will go away after you've driven for a short while and others (like last night) will make the car almost undriveable (if you push the throttle when the revs are dropping, nothing happens, as if you weren't even touching the throttle).

    I changed the airflow meter (just after the airbox) and I've changed the throttle pedal (as the car was throwing up a "Throttle Control Circuit Negative Deviation error code), but still the problem occurs.

    I've searched here and I think my next step is to remove and clean the EGR valve (or replace depending on how bad it is).

    Has anyone else had anything similar or have heard of anything like this and know of a solution as I'm slowly losing patience swapping parts out and getting nowhere

    Thanks in advance...

  2. #2
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    Vehicle : Vectra

    Trim : Design

    Engine : 1.9CDTi

    Year : 2005

    Mileage : Lots

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    Strange one. I'd give the EGR a good clean up and the boost sensor. But failing that I'm a bit stumped. Something in my head is saying possibly the crank sensor but I'm not 100% poisitive.

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    Regular Member wingz123's Avatar
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    bobsignum on here is your man for that.....he came over at the weekend to look at mine as mine was revving high whenever it was started.......turned out to be a cracked hose coming from the intercooler...

    replaced that and now she's as good as gold...I also have an 04' plate Vectra estate 2.0dti...

    Let me know if I can be of anymore help

    thanks,

  4. #4
    Full Member bobssignum's Avatar
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    Vehicle : Signum 2.0 DTi

    Trim : Elegance/Elite

    Engine : 2.0DTi

    Year : 2003

    Mileage : 73350

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    Hi jonathan going by your description of what your car is doing and the fault code reference you quoted( throttle control negative deviation ) then your problem is almost certainly the tps sensor going faulty.
    If you can remember the codes that were generated the one that relates to this is p0638.
    Thats the easy part Vx will not sell you a tps sensor on its own You have to buy a new inlet manifold with a tps and boost sensor part no 2446 0302 or you may be able to find one on e bay or one of the internet vx part s dealers cheapest new one from here would come in at around £200 vx would want around £280-300.
    To get you around this problem of the faultering throttle there is a bodge that can be done remove the engine cover
    and you will find two vacuum hoses that go to diagframs on the engine the nearest one to the egr needs to be pulled off of the diagfram and the vacuum hose to be sealed up this will bypass the diagfam and stop the baffle from closing.
    The enclosed pic shows the layout with the vacuum hose that needs to be pulled out at the bottom of the picture
    Driving vauxhall,s for 30 + years
    and still loving it

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    Thanks for all the replies... It helps to get some other perspectives... I was slowly loading my mind...

    bobssignum... If I take some photos tonight of all the vacuum lines, could you let me know exactly which one I need to pull and plug as I can't quite make it out from your picture (I think its me not looking at it right)?

    Is it the white hoses at the bottom? Does the pipe and the vacuum unit need plugging?

  6. #6
    Full Member bobssignum's Avatar
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    Vehicle : Signum 2.0 DTi

    Trim : Elegance/Elite

    Engine : 2.0DTi

    Year : 2003

    Mileage : 73350

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    Jonathan it is this hose connection but in your case would probably be a white hose as per the other photo , just pull the rubber connector of from the diagphram and fold back on itself and secure with zip tye or similar
    Driving vauxhall,s for 30 + years
    and still loving it

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    All of this is really appreciated bobssignum thanks!!!

    I've just checked the car for error codes now and we have a new one (but it looks like it's similiar if that makes sense). My opcom unit has just thrown out the following:

    Total number of fault codes: 3

    P0638 - Throttle Control Circuit Negative Deviation
    (5A) - Not present

    P0380 - Glow Device Circuit Low Voltage
    (0B) - Present

    P0638 - Electronic Throttle Sensor Circuit High Input
    (07) - Not present


    The last one is the new one, before I just had the "Throttle Control Circuit..." and the glow plug one... This latest one has appeared since fitting another throttle pedal, but I don't know whether it's just coincidence...

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    Regular Member Innes's Avatar
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    Quote Originally Posted by bobssignum View Post
    Jonathan it is this hose connection but in your case would probably be a white hose as per the other photo , just pull the rubber connector of from the diagphram and fold back on itself and secure with zip tye or similar
    Off topic slightly... Bob your engine bay is spanking!!! Still waiting for you to come down to Plymouth to do mine though ;-)

  9. #9
    Full Member bobssignum's Avatar
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    Vehicle : Signum 2.0 DTi

    Trim : Elegance/Elite

    Engine : 2.0DTi

    Year : 2003

    Mileage : 73350

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    Jonathan check all your vacuum hose connections between the vacuum pump outwards to the actuattors making sure the connections are on the right way round ,
    At the same time look for signs of perished or cracked connectors.
    Each of the diagprams should be connected to the load side of the actuattors at the same time check to see if you actually have a vacuum at each of the diagphrams .
    It is only 0.6 bar but should be detctable with a wet finger .
    Last edited by bobssignum; 4th April 2011 at 19:30.
    Driving vauxhall,s for 30 + years
    and still loving it

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    Big thanks to everyone (especially bobssignum!!)

    New upper inlet manifold with TPS and the car runs beautifully... No signs of the running issues! Friendly VX parts man sold me the part at trade price

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