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Thread: Random Misfiring - neutral or park

  1. #1
    Guru Member dubblife has much to be proud of dubblife's Avatar
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    Random Misfiring - neutral or park

    Long story short: Car first started to misfire in reverse at low RPM
    problem migrated to neutral or park after a few hundred miles, however, no longer misfires in reverse.
    here's the vcds code

    7 Faults Found:

    000258 - Mass Air Flow Sensor (G70)
    P0102 - 002 - Signal too Low - Intermittent - MIL ON
    Freeze Frame:
    Fault Status: 10100010
    Fault Priority: 0
    Fault Frequency: 254
    Reset counter: 255
    Mileage: 155755 km
    Time Indication: 0
    Date: 2000.00.00
    Time: 20:07:01

    Freeze Frame:
    RPM: 1248 /min
    Load: 15.7 %
    Speed: 21.0 km/h
    Temperature: 87.0C
    Temperature: 50.0C
    Absolute Pres.: 1000.0 mbar
    Voltage: 13.970 V

    000768 - Random/Multiple Cylinder Misfire Detected
    P0300 - 001 - - Intermittent
    Freeze Frame:
    Fault Status: 00100001
    Fault Priority: 0
    Fault Frequency: 9
    Reset counter: 255
    Mileage: 155844 km
    Time Indication: 0
    Date: 2000.00.00
    Time: 13:32:46

    Freeze Frame:
    RPM: 959 /min
    Load: 25.9 %
    Speed: 12.0 km/h
    Temperature: 85.0C
    Temperature: 49.0C
    Absolute Pres.: 1010.0 mbar
    Voltage: 13.716 V

    000770 - Cylinder 2
    P0302 - 001 - Misfire Detected - Intermittent
    Freeze Frame:
    Fault Status: 00100001
    Fault Priority: 0
    Fault Frequency: 5
    Reset counter: 255
    Mileage: 155844 km
    Time Indication: 0
    Date: 2000.00.00
    Time: 13:32:53

    Freeze Frame:
    RPM: 737 /min
    Load: 27.0 %
    Speed: 0.0 km/h
    Temperature: 65.0C
    Temperature: 45.0C
    Absolute Pres.: 1010.0 mbar
    Voltage: 14.097 V

    000772 - Cylinder 4
    P0304 - 001 - Misfire Detected - Intermittent
    Freeze Frame:
    Fault Status: 00100001
    Fault Priority: 0
    Fault Frequency: 6
    Reset counter: 255
    Mileage: 155844 km
    Time Indication: 0
    Date: 2000.00.00
    Time: 13:32:53

    Freeze Frame:
    RPM: 1533 /min
    Load: 40.4 %
    Speed: 18.0 km/h
    Temperature: 86.0C
    Temperature: 48.0C
    Absolute Pres.: 1010.0 mbar
    Voltage: 13.970 V

    000773 - Cylinder 5
    P0305 - 008 - Misfire Detected - Intermittent
    Freeze Frame:
    Fault Status: 00101000
    Fault Priority: 0
    Fault Frequency: 5
    Reset counter: 255
    Mileage: 155844 km
    Time Indication: 0
    Date: 2000.00.00
    Time: 13:32:53

    Freeze Frame:
    RPM: 737 /min
    Load: 27.0 %
    Speed: 0.0 km/h
    Temperature: 65.0C
    Temperature: 45.0C
    Absolute Pres.: 1010.0 mbar
    Voltage: 14.097 V

    000771 - Cylinder 3
    P0303 - 001 - Misfire Detected - Intermittent
    Freeze Frame:
    Fault Status: 00100001
    Fault Priority: 0
    Fault Frequency: 5
    Reset counter: 255
    Mileage: 155943 km
    Time Indication: 0
    Date: 2000.00.00
    Time: 20:10:28

    Freeze Frame:
    RPM: 741 /min
    Load: 31.0 %
    Speed: 0.0 km/h
    Temperature: 88.0C
    Temperature: 49.0C
    Absolute Pres.: 1010.0 mbar
    Voltage: 13.716 V

    000769 - Cylinder 1
    P0301 - 001 - Misfire Detected - Intermittent
    Freeze Frame:
    Fault Status: 00100001
    Fault Priority: 0
    Fault Frequency: 6
    Reset counter: 255
    Mileage: 156051 km
    Time Indication: 0
    Date: 2000.00.00
    Time: 15:46:28

    Freeze Frame:
    RPM: 1533 /min
    Load: 40.4 %
    Speed: 18.0 km/h
    Temperature: 86.0C
    Temperature: 48.0C
    Absolute Pres.: 1010.0 mbar
    Voltage: 13.970 V


    Readiness: 0000 1000


    If MAF sensor is removed, no more misfiring, CEL remains and codes would only be p0102 and p0113

    I went to the scrap yard and found a MAF from mk4 1.8t, cel was cleared manually after. was fine for about 20 mins after changing, after 30 min, when the car was put into neutral and idled about 30 seconds when the misfire came back, no flashing CEL but you can hear and feel the misfiring.

    what should i change next?

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  3. #2
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    Re: Random Misfiring - neutral or park

    remove and plug the end of your n80 valve hose on the intake manifold side to see if the idle improves.

    did you test your PCV (oil cap test)?

    the mkiv part is compatible? you may want to put the original part back on.
    09 CW, 2D, Manual w/ Gorilla Skin + Legos

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    Guru Member dubblife has much to be proud of dubblife's Avatar
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    Re: Random Misfiring - neutral or park

    I took off the oil cap while the engine was running, i felt slight suction as i remove the cap, but not significantly harder than when i did the oil change.

    by n80 valve i assume you mean this


    you want me to unplug this while the engine is running right? like you would do before seafoam?

  5. #4
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    Re: Random Misfiring - neutral or park

    if you have a way of squeezing/clamping off the line to let no vacuum through, then you don't have to remove anything.

    vise-grips and two pieces of wood might work too.
    09 CW, 2D, Manual w/ Gorilla Skin + Legos

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    Guru Member dubblife has much to be proud of dubblife's Avatar
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    Re: Random Misfiring - neutral or park

    hey, so i finally was able to perform purge valve test, if i leave the engine on and unplug the pipe, the engine starts choking right away, if i obstruct the pipe while the other end is still plugged into the throttle body, the roughness goes away, i held it for a good minute and still seems to be fine. what does that mean?

    Second thought* would the transmission be the issue here? because the misfire literally goes away if i shift it into gear, and comes back as soon as I shift it back to neutral or park.

  7. #6
    caffeinalienated le0n has a reputation beyond reputele0n has a reputation beyond reputele0n has a reputation beyond reputele0n has a reputation beyond reputele0n has a reputation beyond reputele0n has a reputation beyond reputele0n has a reputation beyond reputele0n has a reputation beyond reputele0n has a reputation beyond reputele0n has a reputation beyond reputele0n has a reputation beyond repute le0n's Avatar
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    Re: Random Misfiring - neutral or park

    Quote Originally Posted by dubblife View Post
    if i obstruct the pipe while the other end is still plugged into the throttle body, the roughness goes away, i held it for a good minute and still seems to be fine. what does that mean?
    so it doesn't misfire when you perform the above test?

    if it doesn't misfire and it idles smoothly when performing that test, then you change the N80 valve.
    09 CW, 2D, Manual w/ Gorilla Skin + Legos

  8. #7
    Guru Member dubblife has much to be proud of dubblife's Avatar
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    Re: Random Misfiring - neutral or park

    i did a parts lookup and got several numbers, which one do you have?
    Alternate/OEM Part Number(s): 058133517, 06E906517A, 077133517c, 0K01C18741, 1C0906517A, 2891022040, 6Q0906517A, 9135444

  9. #8
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    Re: Random Misfiring - neutral or park

    ecs shows only one part number for my car: 06E-906-517-A

    deutscheautoparts.com shows the same.
    09 CW, 2D, Manual w/ Gorilla Skin + Legos

  10. #9
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    Re: Random Misfiring - neutral or park

    The reason it does not misfire in gear, is because fuel and air are increased.

    If the valve is stuck open, you're losing vacuum, not a lot, but enough to
    cause the rough idle. Going into gear, the air and fuel are upped, so that offsets
    the vacuum loss with more fuel and air. Small vacuum leaks cause rough idle,
    but go away with more fuel and air... Older cars used vacuum to open and close
    the EGR valve, like on my former 2000 Avenger ES. The diaphragm deteriorated, and
    vacuum leaked past it, and the engine would idle rough and almost stall. Driving, it was
    fine. I removed the vacuum line to the EGR at the intake plenum, capped it, then
    plugged the hose back over top the cap, and it was fine, AND passed emissions every time...

  11. #10
    Junior Member WascallyWabbit is a jewel in the rough WascallyWabbit's Avatar
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    Re: Random Misfiring - neutral or park

    Random misfire on #5 cylinder. P0305. Pulled the plug and I had about a teaspoon of oil in the plug cavity. Could this be a cracked head? I did not see any evidence it could have been spilled oil. The ceramic on the plug had a couple burn spots on it. Replaced the plug and runs fine now, but concerned it is sign of a much larger issue.
    Last edited by WascallyWabbit; 03-31-2017 at 08:13 PM.

  12. #11
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    Re: Random Misfiring - neutral or park

    Probably just a valve cover gasket.
    09 CW, 2D, Manual w/ Gorilla Skin + Legos

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