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Thread: How to check an for inlet/vaccum leak and faulty injectors? Engine misfire under load

  1. #1
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    Vehicle : Transit Custom

    Trim : Limited

    Engine : 125PS

    Year : 2013

    Default How to check an for inlet/vaccum leak and faulty injectors? Engine misfire under load

    My car starts and idles fine, it revs OK and idles OK. Its onlly when the car is under load, does it misfire, it will gain revs but is not well at all.

    I have checked plugs, coil pack, egr valve, throttle body and the crank sensor, although the can has never shown an EML and I have used electrical spary on as many connectors as I can find including ECU.

    I am now thinking either a leak at the inlet or the vaccum hoses, but I do not understand how to check for this, any advice please.

    My only other trail of thought, is it may be a faulty injector, is there a way to check for this, would that have shown an EML?

    Any ideas please folks, its a tough one. Vectra C 2.2 (Z22SE) SRi 52 plate 56k miles, well serviced car in very good condition.

    Thanks

  2. #2
    Regular Member Gsi3.2's Avatar
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    inlet or vacumn leaks can be found either by the sound of rushing air, or by spraying suspect joints with carb cleaner..the engine note will change if it's being drawn in and you'll also see if disappear....

    injectors will need tesing off the car, by someone with the correct equipment... a failed or leaking injector won't generate a fault code if it lets fuel past..

    Under load misfiring ( pinking) is 100% a timing fault if it revs right when not pulling...so, thats where i'd start looking..

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    Vehicle : Transit Custom

    Trim : Limited

    Engine : 125PS

    Year : 2013

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    What would you look for, Im open to as many ideas as I can get. It will rev Ok, but you can tell its not as good as normal.

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    Regular Member rickyroo's Avatar
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    if you want to check for air leaks easy way also is t pull off your air box and put your hand over the chargepipe going in before your maf sensor hence it should suck the pipe in as you are shutting off the air but with the pressure you will hear a hissing by any joints leaking.

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