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Backfiring problems...

Discussion in 'HYBRID -> EG-EK / DC' started by BLKCIVICPN0I, Feb 19, 2004.

  1. BLKCIVICPN0I

    BLKCIVICPN0I Member

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    I have a 00 JDM b18c swap in my 00 Civic with bolt ons and on a PCT ECU.. My problem is that when i'm revving high around 4000 rpm nd up, my car starts to backfire like crazy. When I'm on 1st nd hitting 4000 rpms it'll start backfiring den when i shift to 2nd it'll continue. Has this ever happened to anybody? or does anyone know what can be wrong? Some ppol say it could be my timing, exhaust ( I have a mugen 4-1 header w/ a 2.5" inlet connected to stock pipings), distributor cap & rotor... Any help is appreciated...
     
  2. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    got a cat?
     
  3. BLKCIVICPN0I

    BLKCIVICPN0I Member

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  4. CRX_B16B

    CRX_B16B Senior Member

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    I would check timing. does it knock?
     
  5. BLKCIVICPN0I

    BLKCIVICPN0I Member

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  6. hybrid_b18

    hybrid_b18 crew chief

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    yea my hatch used to be really bad wen i had my custom 2.5" exhaust no cat, but when i went back to the ls exhaust it stoped a little. so i dunno. i didnt kno timing would cause you to back fire. what to advanced or retarded? let me kno if you find out anything.
     
  7. cws13

    cws13 Senior Member

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    When it's hot or cold and are you running rich?
     
  8. driverunknown

    driverunknown Senior Member

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  9. cws13

    cws13 Senior Member

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    True, sounds like spark knock- but that wouldn't backfire.
     
  10. hybrid_b18

    hybrid_b18 crew chief

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    I MAY BE RUNNIN A LITTLE RICH
     
  11. hybrid_b18

    hybrid_b18 crew chief

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    sorry mang i dont wanna be buttin in on your thread, but im havein the same problem. diffrent engine
     
  12. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    running rich is a given
    gotta figure out why....

    bad plugs (fuel not burning fully)
    timing off
    no cat / bad cat
    ECU just dumping way too much fuel in (most chipped ECUs run stupidly rich)
     
  13. highperboi

    highperboi Senior Member

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    why would not having a cat cause backfire?
     
  14. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    because the cat is there to burn up unburnt fuel before it makes it to the air
    but if you are running retardedly rich it cant burn it all
     
  15. B16ASilverhonda

    B16ASilverhonda Member

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    wrong cat is there to turn hydrocarbons into carbon dioxide and water. PCV valve carries blow by gases from the crankcase back into the intake system for re-entry into the combustion chamber. Maybe clogged PCV valve?

    Defently Check:

    Timing
    PCV Valve
    Plugs (NGK's ONLY or Denso's)
    Spark (Wires, Cap, Rotor, Etc)

    If you back fire too much you can bend an exhaust valve, think about it when your backfiring air is entering the exhaust system. so be careful
     
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