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Thread: Misfire on idle

  1. #1
    VXRed
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    Thumbs down Misfire on idle

    Hi guys don't post alot but do read the forums, anyway I have a 15 plate clubsport with 38k on it, only mods is a decat and is starting to misfire on idle only, car drives perfect apart from that, just wondering if anyone could shed some light for me and just hope it isn't the dreaded piston 4.. As can't afford a rebuild the now.. Thanks in advance

  2. #2
    VXRacing ahead vxrmjp's Avatar
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    Coil pack?
    Piston 4 is possible, but to be certain a compression test is needed.
    Get it looked at sooner rather than later. If it is p4, delaying repairs and still driving the car could cost considerably more as the damage could result in a bottom end rebuild and oversized pistons etc.
    SAVE THE VXR AND STOP BUYING SUV TOSH!

  3. #3
    VXR enough nippyrascal's Avatar
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    replace coil pack and plugs use genuine only and see if that sorts it , if not more investigation .

  4. #4
    VXRacing ahead Brucerutherford's Avatar
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    Quote Originally Posted by nippyrascal View Post
    replace coil pack and plugs use genuine only and see if that sorts it , if not more investigation .
    This, I'd go with plugs and coilpack first.

    If it helps, the part number for plugs is BKR8EIX.

    Coilpack should be a delphi one.

    Also could be MAF, although it doesn't sound much like a MAF problem! But again, if you do replace that, go with Bosch as it doesn't like aftermarket ones
    | Star Silver Corsa VXR | Milltek Turbo Back W/ Cobra Decat | Ramair Cone W/ Fog Light Air Feed | JS Performance Coolant & Intake Hoses | Airtec FMIC | 395cc Injectors | Forge Recirc | Walbro 255 fuel pump | Forge Subframe Brace | Boot Brace | 50mm H&R Springs W/ Bilstein Shocks | Mtech Short Shifter | Uniroyal Rainsports | Triple R Splitter | OPC Fog Surrounds | Mesh Lower Grille | RS Tuning Mapped | 233 BHP / 251 lb ft |

  5. #5
    VXRed
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    you say you have d cat it have you done that recent and also have you had it mapped since?

  6. #6
    VXRed
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    Just an update guys, done a compression test and is p4 starting to fail..

  7. #7
    VXRed blooded 20Drift's Avatar
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    Quote Originally Posted by Ckem247 View Post
    Just an update guys, done a compression test and is p4 starting to fail..
    Out of interest, what were the values?
    Corsa VXR - Stage 2 Rabbid Remapped
    TD Pro Race 1.2's | Airtec Intercooler | Brembo Drilled/Grooved Discs | K&N 57s Induction | NGK Iridium Spark Plugs
    Remus 3 Piece | EP Silencer Delete | Remus Cat Back | 5000K HIDs | Boost & Water Temp Gauge | Pressed Plates

  8. #8
    VXRed
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    Quote Originally Posted by 20Drift View Post
    Out of interest, what were the values?
    1,2,3 175 psi. 4 was 115 but lost pressure after engine stopped cranking

  9. #9
    VXRed blooded 20Drift's Avatar
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    Quote Originally Posted by Ckem247 View Post
    1,2,3 175 psi. 4 was 115 but lost pressure after engine stopped cranking
    Ah man that's a shame. You going to forge or just repair?
    Corsa VXR - Stage 2 Rabbid Remapped
    TD Pro Race 1.2's | Airtec Intercooler | Brembo Drilled/Grooved Discs | K&N 57s Induction | NGK Iridium Spark Plugs
    Remus 3 Piece | EP Silencer Delete | Remus Cat Back | 5000K HIDs | Boost & Water Temp Gauge | Pressed Plates

  10. #10
    VXR enough nippyrascal's Avatar
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    Another piston 4 bites the dust , just unlucky you going to forge , repair or replace car.

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