Help with missfire?

Discussion in 'General Impreza WRX chat' started by sc86, Nov 29, 2017.

  1. sc86

    sc86 V-Limited Member

    Hi lads - looking for help
    Version 5 type r
    Just rebuilt engine - its flying
    Bar 1 problem - its letting a missfire out at 4500 in every gear
    not missfire anywhere else
    its also pop and bangin alot on lift off
    which may not be connected
    it passed the test last week so emmisions are good
    would that rule out air flow meter?
     
  2. Topper Harley

    Topper Harley V-Limited Member

    Location:
    Westmeath Ireland
    I'd be looking at air flow too. Presume plugs etc are all good.
     
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  3. sc86

    sc86 V-Limited Member

    any i had with dodgy afm the car struggled to tick over or wouldnt ?
    ye everything is new
     
  4. Topper Harley

    Topper Harley V-Limited Member

    Location:
    Westmeath Ireland
    Airflows can be tricky sometimes but if you can borrow a known working one. Not mega money new anyway . Any fault codes.

    Fuel pump ok ??
     
  5. sc86

    sc86 V-Limited Member

    new fuel pump in it
     
  6. 1509joe

    1509joe Type RA Member

    Is it misfiring above 4500 or just at 4500 if its everything above 4500 check your new fuel pump and wiring to it.
     
  7. sc86

    sc86 V-Limited Member

    just at 4500 every time
    goes over no prob as already said

    swapped afm today and no diff so back to drawing bord
    gona fit new plugs and re gap tomorrow and see
     
  8. ap3x

    ap3x Type RA Member

    Location:
    Vancouver, Canada
    dealt with this many times before with early - late gcs and problem is always the plugs
    just get a new set and gap them properly and that will sort her out
     
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  9. sc86

    sc86 V-Limited Member

    please god it does ha!
     
  10. Topper Harley

    Topper Harley V-Limited Member

    Location:
    Westmeath Ireland
    Have a set of plugs if you are stuck .
     
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