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Diagnosing bad injectors (DV6C)

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  • 08-07-2024 1:49pm
    #1
    Registered Users Posts: 1,118 ✭✭✭


    Apologies for the long post

    The missus car is running a bit badly, smell of fuel in the car, presumably injector issues there's no sign of exhaust leak and copper washers were done this year along with leak off pipes from Ford . Car has 300k km on it on original injectors also, it's the DV6C engine which is known for injector trouble.

    DTC codes P02D3 and P02D1 for injector offset learning at max limit for cylinder 3 and 4. Air filter is new and so is the fuel filter.

    I tested injectors with the old school screwdriver on injector body, cylinder 2 and 3 sound good and rhythmic, cylinder 1 and 4 don't sound as good.

    Plugged out all 4, 1 at a time with engine running. Not much change when unplugged cylinder 1 and 4 injector.

    Massive change when I unplugged cylinder 2 and 3 injector.

    Is this definitive that injectors in cylinders 1 and 4 need changing, she doesn't want to replace all 4 against my recommendation so just going to change ones that need to replace now.

    Thinking of doing a leak off test next that would be more precise wouldn't it?

    As an aside. I know the French diesels cylinder are numbered 1-4 with 1 being at the flywheel end. But on this particular Ford focus MK3 number 1 is at the timing belt end, unplugged the injector on that side and Forscan said injector cylinder 1 short circuit.



Comments

  • Registered Users Posts: 1,118 ✭✭✭BlakeS94


    Bump

    If anyone has some experience or advice it'd be greatly appreciated



  • Registered Users Posts: 755 ✭✭✭mk7r


    The best advice is to take all 4 out and send them for testing, none will pass at 300k but at least it's evidence to support your replace all 4 advice.

    They are usually available cheaper X4 than individually too



  • Registered Users Posts: 2,167 ✭✭✭PukkaStukka


    Does sound like injectors alright. In Forscan, there should be PID's for injector correction factors. That number will be much higher on the problematic injectors. Probably best to pull all four out and get them bench tested



  • Registered Users Posts: 1,118 ✭✭✭BlakeS94


    Might do that as I think getting them tested is cheap enough, thanks lads



  • Registered Users Posts: 1,118 ✭✭✭BlakeS94


    Performed a leak off test today, don't really know what it tells they're either all fcuked or all okay. Pretty much exact same level.

    Cyl 1: 30ml

    Cyl 2: 30ml

    Cyl 3: 35ml

    Cyl 4: 35ml

    This is how I did the test, car at operating temp, plugged in the plumbing for the leak off bottles, ran engine untill fuel started entering bottles, removed fuel inside bottles and reconnected, started engine again for exactly 3 minutes and this is how much they filled up.



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  • Registered Users Posts: 1,118 ✭✭✭BlakeS94


    This is the cylinder balance on Forscan that's all I see?

    Injector pilot learning also



  • Registered Users Posts: 1,118 ✭✭✭BlakeS94


    Fuel rail pressure is a bit low at 22000 on idle, could this be due to injectors leaking back too much.



  • Registered Users Posts: 2,167 ✭✭✭PukkaStukka


    Is the car smokey through the exhaust, and / or producing lots of knock?

    At this stage and given your previous fault description, I'd still be leaning towards faulty injectors. If the injector is going open or short, you could still end up with no significant leak off from that faulty injector. What you could do if you were minded is to swap a good and suspected injector. You will have to recode both, but if that fault moves with the injector, I would take it as proof that the injector is indeed suspect.



  • Registered Users Posts: 1,118 ✭✭✭BlakeS94


    No not smokey at all. It does have an injector knock type sound when you lett the revs climb under load, doesn't knock in any other circumstance that I've tested.

    Looked up some Peugeot forums and saw a post about 1.6hdi (same engine) stating Injector leak off max is 35ml in 3 mins



  • Registered Users Posts: 2,167 ✭✭✭PukkaStukka


    The Pug and Citroen applications of that engine use a different injector to the Fords. Fords (I think) largely use Delphi injectors, while the French use Siemens and continental. We swapped a blown DV6C in a Focus a few years back and the replacement engine came from a 308. We had to carry over the wiring loom and injectors from the old engine because the French setup was completely different to the Ford. The replacement engine worked perfectly



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  • Registered Users Posts: 1,118 ✭✭✭BlakeS94


    Oh right, to my knowledge they don't. I know 100% the injectors in this Ford focus MK3 are Siemens/VDO.

    Look like this

    It's probably not conclusive seeing leak rates on a different car anyway there could be small differences in there like you said.

    Couldn't go down the route of bench testing as she needs the car everyday (2 kids, I'm gone a lot working shift)



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