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Thread: 2004 1.4 16v BCA misfire on cyl3, maxed out -LTFT.

  1. #1
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    2004 1.4 16v BCA misfire on cyl3, maxed out -LTFT.

    Hi all. Could do with some guidance on this one please. Missing on cyl3. Can tell more on tick-over where you can hear the exhaust buffeting, but seems to drive ok. Serviced, new filters, new plugs, new coil packs, new egr valve, throttle body removed and Cleaned, map removed and cleaned, lambda removed and cleaned but not replaced yet.
    Wife: 2004 Golf 1.4 16v BCA

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    Interestingly I have just found that there is a retaining clip missing on injector 3. All others have one except this, yet I’ve held it down while running and it doesn’t seem to be effecting it, but ordered one anyway. Are the injectors a common issue at all?
    Wife: 2004 Golf 1.4 16v BCA

  3. #3
    Administrator Keithuk's Avatar
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    You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


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    Thanks, I’ve got a lot of pictures to upload from the scan then, it won’t let me add them from my phone. Will update shortly.
    Wife: 2004 Golf 1.4 16v BCA

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    Click image for larger version. 

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    code p0303. And it clears until restarted and ran again.


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    noticed the spark advance flickers from 0.00 to 3.5’ on tick-over cool. Goes up 0-5 when warm. not sure if that’s ok?

    more to follow...
    Wife: 2004 Golf 1.4 16v BCA

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    short term fuel trim bank 1 sensor 2 at 99%? That can’t be right surely??

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    Wife: 2004 Golf 1.4 16v BCA

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    that’s all the views I have on monitor while idle and cold.

    few shots next show it warm after giving it a few revs the STFT seems to shift and some percentage moves from sensor 2 to sensor 1. Not sure what that means really? When it settles it goes back to a negative 45-50%.

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    what other kind of information can be provided ? I’ll see what I can do.... ����
    Wife: 2004 Golf 1.4 16v BCA

  8. #8
    Administrator Keithuk's Avatar
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    VAG Error Code: 16687/10593/6352/4060/000771
    EOBD II Error Code: P0303

    Fault Location:
    Cylinder 3 - Misfire Detected

    Possible Cause:
    Malfunction Indicator Lamp (MIL)(K83) active.
    Lack/loss of power.
    Hard start.
    Engine hesitation.

    Wiring/Connector(s).
    Ignition system.
    Fuel injectors.
    Fuel pressure.
    Running out of fuel.
    EVAP canister purge valve.
    Evaporative emission system.
    Low compression.
    Base engine problems.
    Engine Control Module (ECM) damaged.

    Possible Solutions:
    Check/Replace all faulty Wiring/Connector(s).
    Do a compression test.
    Read Measuring Value Blocks (MVB) 15 if misfire changes location.

    Special Notes:
    This feature search for engine misfire in a specific cylinder. Most of the time the cause for a misfire is a lack of combustion in a cylinder due to absence of spark, poor fuel metering, or poor compression.

    Tech Notes:
    The P0303 code means that the cylinder 3 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 3. If the problem persist more tests needs to be done to diagnose problem.

    Description:
    When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Engine Speed (RPM) Sensor [G28]/Crankshaft Position Sensor [G28] signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

    As taken from my new EOBD II Fault Codes Software
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


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  10. #9
    Administrator Crasher's Avatar
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    The clip being missing suggests someone has disconnected the injector whilst trying to diagnose the problem. Very occasionally injectors fail and coil packs are terrible but the fuel trim strongly suggests excess oxygen so I would start with a compression test as these 16v engines are extremely prone to worn exhaust valves guides which causes the exhaust valves to burn and lose compression. If you clear the misfire code with the engine running, does the misfire go away for a few seconds?
    If you care about the future of the planet, read this and watch the video

    https://www.bosch.com/stories/synthetic-fuels



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  12. #10
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    Thanks, I’ve switched the clips around and it made no difference, so ruled that out for now. I am trying to get someone come and do a compression test on it this weekend so hopefully I can rule that out too. It has been intermittent yes, sometimes you can start it and it’s fine, but leave it a short while and it’ll start missing. That’s how it failed mot. It was fine going there, but when it had been left sat running it started missing and obviously then failed emissions. That’s what gives me hope it’s not a valve issue really as wouldn’t that be more consistent? Or could it just be a sticking valve then just starting to go? It this an easy fix from above or is it a head off job?
    Wife: 2004 Golf 1.4 16v BCA

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