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Thread: 1.9 CDTI 8v 1500 rpm MISFIRE

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    Default 1.9 CDTI 8v 1500 rpm MISFIRE

    Hi all.
    I've just bought a vectra estate design 1.9 cdti 120, manual 2005 (55) 115,000 miles. Done a full service incl fuel filter and cambelt.
    Cleaned all of the egr valve, associated pipework and fully freed up a stuck solid egr solenoid - the pin wouldnt move..! But now good. I also cleaned out the MAP sensor which was coked up soild and cleaned up the boost valve on the bulkhead including the filters and plunger. Checked the vacuum hoses all ok.

    Now, after cleaning everything up i now have a misfire/jerkiness at almost exactly 1500ish rpm on light throttle loads, ie, you're in 2nd or 3rd gear coming up behing another car so you back off the throttle then put you foot down a tiny bit to maintain speed agaIn. When you do this the engine jerks/misfires as if it hiccups. If you apply more gas it seems to be ok and it only does it at around 1500ish rpm.
    Now i guess it may be egr related as it should now be working properly (it certainly wasn't before i cleaned it) and the map sensor can actually sense pressure variations.
    I read on here about software updates, looking on my car in the menu it says SW with lots of numbers etc then 2004. But no-one on here has said that any software updates have worked..?

    So has anyone suffered/suffering with this thats found a solution..?
    many thanks,

    Dave.

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    Unplug the EGR and see how it goes.
    If it judders what colour is 3rd injector
    http://www.vectra-c.com/forum/showth...njector-wiring
    Also i hope you changed water pump as well. Its normally these that seize and take out belt.

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    Vehicle : Mk1 renault scenic... I know I know but it drives

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    Engine : 1.6 16v

    Year : 2003

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    Clean the boost sensor

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    Water pump and tensioner / idler was done yeah, big fan of doing that at cambelt time..! Boost sensor (MAP) sensor was cleaned too. The injectors have the yellow plugs but i didnt think this was an 8v issue..?

    I'll unplug the egr to see if that helps.

    Not a software thing then..?

    Thanks for your replies

    Dave.

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    Engine : Z18XER



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