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Thread: Vectra c z20net help !!!

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    Regular Member matrix1979's Avatar
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    Default Vectra c z20net help !!!

    Hi all , I'm not sure if anyone can help but my 2.0 turbo (z20net) is still running rough on idle and is running to rich , mpg has dropped ,plus its smells really gasy coming out of the rear exhaust boxes . I have tryed many things to sort this issue but no luck , things I tryed are .... New coolant temp sensor , new plugs , new lamda sensor , new throttle body , fuel filter , maf sensor , checked compression test ..ok , coil packs checked ok , if anyone can help I would be very greatfull ,,,, mark .

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    Regular Member C-Owner's Avatar
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    Tech 2 or Vaux-Com session is needed.

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    Any warning lights showing on the dash?

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    Regular Member Chunklamb's Avatar
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    Vehicle : 330D (13) Tourer 258 Auto & Signum 1.9 CDTI (07) 150 Auto

    Trim : M Sport and Design

    Engine : Z19DTH

    Year : 2007

    Mileage : 38100

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    Are there 2 lamda sensors on the Z20NET? Have you replaced both?

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    Regular Member matrix1979's Avatar
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    Quote Originally Posted by Chunklamb View Post
    Are there 2 lamda sensors on the Z20NET? Have you replaced both?
    Yer there are 2 lamdas on the z20net one pre cat and one post cat but i didnt think the one situated on the exhaust under the car would nt be the issue

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    Regular Member matrix1979's Avatar
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    Quote Originally Posted by Rebellion View Post
    Any warning lights showing on the dash?
    yes the engine managment light have been on in the past but will go out again automatically shortly after ... had it read and the codes were...(PO171 System Too Lean Bank 1) and P0300 Random/Multiple Cylinder Misfire Detected .

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    VIP-Member Caveman_nige's Avatar
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    Vehicle : Signum & Insignia

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    I had to replace lambda 2 in the exhaust centre section. Its attached back to the engine bay witha long cable but I cut the wiring and joined the new one on.

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    Regular Member PCMALT's Avatar
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    Vehicle : Signum V6 CDTI

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    Engine : Y30DT

    Year : 2005

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    normally if it is a lambda fault then the EML light would come on, Have you checked the condition of the filters ie fuel and air as these can effect fuel economy and general fuelling but as said before i would get it on diagnostics and see what's going on there run live data and see what the lambdas are doing.
    Last edited by PCMALT; 21st March 2013 at 22:56.

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    Regular Member matrix1979's Avatar
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    Quote Originally Posted by Caveman_nige View Post
    I had to replace lambda 2 in the exhaust centre section. Its attached back to the engine bay witha long cable but I cut the wiring and joined the new one on.
    Did you have the same symtoms as i had nige and it cured it with changeing lambda 2 on the exhaust ?

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    Regular Member matrix1979's Avatar
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    Quote Originally Posted by PCMALT View Post
    normally if it is a lambda fault then the EML light would come on, Have you checked the condition of the filters ie fuel and air as these can effect fuel econemy but as said before i would get it on diagnostics and see whats going on there run live data and see what the lambdas are doing.
    Yer i have checked the filters and replaced all

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