CX Backfiring
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Thread: CX Backfiring

  1. #1
    WRB
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    Default CX Backfiring

    hi,
    My CX is backfiring during de-acceleration. I would have thought this impossible on an electric injection car.
    Anybody know what I should be looking for to fix it?

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    Thanks

    Warren

  2. #2
    Fellow Frogger! Fingers's Avatar
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    Vacuum leak?
    addo likes this.

  3. #3
    WRB
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    I will check all of the hoses.

    Thanks

  4. #4
    Real cars have hydraulics DoubleChevron's Avatar
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    popping on the over-run shouldn't happen. I can get the turbo to pop nicely on the overrun by gently touching the throttle.

    You see if the engine is doing more than 1800rpm and the throttle is shut (ie: the throttle spinal in closed) it chops the fuel injectors out. So all you need to do is check the accelerator cable is allowing the engine to drop back to idle, and make sure the idle/full load switch on the throttle spindle is working.

    seeya,
    Shane L.
    'Cit' homepage:
    Citroen Workshop
    Proper cars--
    '85 Series II CX2500 GTi Turbo I
    '63 ID19 http://www.aussiefrogs.com/forum/citro%EBn-forum/90325-best-project-car-you-have-ever-seen.html
    '72 DS21 ie 5spd pallas (last looked at ... about 15years ago)
    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

    Yay ... No Slugomatics


    Modern Junk:
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    WRB
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    Thanks Shane,

    The throttle cable has a few broken strands and, it isn't going all the way back to the stop. Its' idle speed can vary between around 800 and 120 rpm during a drive so, that will be the problem.

    cheers
    Warren

  6. #6
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    Onlytime I've had backfiring problems was when I put bad fuel in the car (less than 95)

  7. #7
    Real cars have hydraulics DoubleChevron's Avatar
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    carby CX's will pop and cackle on the over-run, but only if you don't have a rear resonator fitted. outright backfiring should never happen with any of them though.

    Another issue with the injected one above could be the engine mounts. If the engine is moving a large amount due to collapsed mounts, it'll pull/release on the accelerator cable, and twist/flex the inlet tract, possibly allowing un-metered air in after the AFM.

    seeya,
    Shane L.
    'Cit' homepage:
    Citroen Workshop
    Proper cars--
    '85 Series II CX2500 GTi Turbo I
    '63 ID19 http://www.aussiefrogs.com/forum/showthread.php?t=90325
    '72 DS21 ie 5spd pallas (last looked at ... about 15years ago)
    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

    Yay ... No Slugomatics


    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual

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