604 firing back
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Thread: 604 firing back

  1. #1
    1000+ Posts Pug_405_Mi16's Avatar
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    604 firing back

    Hi,

    I have a 604 question....

    The car is timed correctly and points are fine and firing order is OK...and compression is fine *test has been done*

    But the car seems to fire back at around 3,000rpm...it idles fine and seems to have power but once taken up to 3,000rpm it fires back...

    Any thoughts ?

    I've tried leads already!

    Ben

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    1989 Peugeot 405 Mi16
    1990 Peugeot 505 GTD Turbo Wagon
    2000 Peugeot 306 XSI
    1973 Peugeot 504 GL





  2. #2
    Budding Architect ???? pugrambo's Avatar
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    what carb is on it ?
    how old are the plugs and what are they ?
    what gap are the plugs set at ?
    electric fuel pump fitted or standard pump ?
    how old is the exhaust and if a muffler has been replaced is it on the right way around ?
    3 x '78 604 SL

    1 x 2018 3008

    1 x 2000 Citroen XM,

    1 x '98 306 GTi6 sadly sold

    1 x secret project

    1 x '98 406 STDT troop carrier and i don't care if it stinks, i don't sniff it's arse Death by wank tank

    1 x '99 406SV 5spd wagon, time to burn more fuel

    1 x 1994 605 SV3.0

  3. #3
    1000+ Posts Pug_405_Mi16's Avatar
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    Sean,

    it has the Solex carbies on it, Bosch plugs *fairly new* gap of 20thou, standard fuel pump, yes the exhaust is fine...

    Thanks

    Ben
    1989 Peugeot 405 Mi16
    1990 Peugeot 505 GTD Turbo Wagon
    2000 Peugeot 306 XSI
    1973 Peugeot 504 GL





  4. #4
    Moderator Alan S's Avatar
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    Sounds similar to symtoms I've struck when the fuel filter is getting past it's use by date.
    In carby engines, moisture in the carb particularly in Weber dual throat types will start to cause spluttering & backfiring as it gets around mid range before it goes onto the main jet. If you flatten the accellerator, does it get worse or just hesitate & then take off as normal?
    A bottle of fuel system cleaner wouldn't go astray.

    Alan S
    If it ain't broke, use a 12" shifter.....that usually does the trick!!

  5. #5
    Budding Architect ???? pugrambo's Avatar
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    Pug_405_Mi16:
    Sean,

    it has the Solex carbies on it, Bosch plugs *fairly new* gap of 20thou, standard fuel pump, yes the exhaust is fine...

    Thanks

    Ben
    check for vaccuum leaks everywhere
    sounds like a case of the second carb also may need a kit through it or just a damn good clean out
    2 bottles of fuel system cleaner in about 1/2-3/4 of a tank should do it and just drive it but it really sounds like the rear carb is playing up

    now we have that out of the way
    pics pics pics are needed of this new girl
    3 x '78 604 SL

    1 x 2018 3008

    1 x 2000 Citroen XM,

    1 x '98 306 GTi6 sadly sold

    1 x secret project

    1 x '98 406 STDT troop carrier and i don't care if it stinks, i don't sniff it's arse Death by wank tank

    1 x '99 406SV 5spd wagon, time to burn more fuel

    1 x 1994 605 SV3.0

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