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Thread: Misfire when cold

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    Spanner Monkey paulmex's Avatar

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    Misfire when cold

    My mk2 standard apart from stage 1 castle chip starts 1st time But has a really bad misfire ,so bad it hurts your eyes until it warms up I've searched the posts and tried just about everything out there?
    Its has 55psi in rail at tickover which Increases to 65 when reg is disconnected and co is3.0% at idle when warm ,Tryed the usual plugs and closing the gaps , it's had a full set of sensors from Brands hatch,swopped the map sensor,all the Ht changed inc grpA coil ,I've even changed the ecu but still the same
    I've not done anything with the injectors as of yet but I'm running out of ideas the trouble is it goes really well once it's warm but does smoke a bit when the throttle is blipped which says to me it's still too rich above idle ?
    Im wondering if I've been really unlucky and have 2 duff ECT sensors
    Any ideas most welcome Cheers Paul

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    Re: Misfire when cold

    Does it NEED 55psi fuel pressure? Most (not all) systems are designed around 1 bar / 43psi. If FPR is disconnected from the vac. source it will of course just provide unregulated base pump pressure. I'd try winding it down a bit and see what happens?

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    Re: Misfire when cold

    Quote Originally Posted by katana View Post
    Most (not all) systems are designed around 1 bar / 43psi.
    Do you mean 3 bar / 43 psi?

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    Spanner Monkey djaminhi's Avatar

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    Re: Misfire when cold

    Has problem occurred after the chipping?....faulty mapping?

    Faulty FPR......dumping too much fuel?

    Have you tried a bog standard ECU?

    Maybe ECT sensor wiring?

    Vacuum leak in the system?
    Regards,
    Kevin

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    Re: Misfire when cold

    Quote Originally Posted by Miniliteman View Post
    Do you mean 3 bar / 43 psi?
    DOH ! - Yes...... not enough coffee!

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    Spanner Monkey paulmex's Avatar

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    Re: Misfire when cold

    Thanks for all replies lads most appreciated it's sorted now
    The car has had a new wiring loom and is running 2wd ecu and Tps, but the loom Tps wiring is set up for a 4x4 !!!! Swopped the 2 outer wires over and it's perfect job done
    I will sleep well tonight
    Thanks again everyone

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