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  1. #1
    Active Member One Ring
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    Nov 10 2015
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    364288
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    Mazda Miata 93, Seat Leon, Audi A4 1.8TQM
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    Question Learning VAG COM, Help me interpret this numbers from a Log

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    Hello to all! I have been a member for a while, and most questions I have have been answered by searching... Thanks!

    However, after reading that ignition retardation should always be close to or simply read 0, I was surprised to find this...

    How can I go about it?

    The car is completely stock, 1998 AEB engine n-DBW, 1.8T but was garaged for over 2 years, so I am currently bringing it back to life little by little, and am learning to use the VAG COM tool to check it state of tune...

    The car runs fine apparently in normal operation

    The log is longer, but these are the parts that don't seem to look right...

    Engine Speeed Engine Load Timing Retardation Timing Retardation
    Cylinder 3 Cylinder 4

    1200 3.40 1.5 0.0
    1040 3.60 4.5 0.0
    960 3.70 6.0 1.5
    1000 3.70 5.2 4.5
    1040 3.70 5.2 4.5
    1120 3.75 4.5 3.7
    1200 3.75 4.5 3.7
    1280 3.75 3.7 3.0
    1360 3.70 3.0 2.2
    1440 3.50 2.2 3.7
    1560 3.05 2.2 3.0
    1600 2.65 1.5 3.0
    1680 2.50 1.5 3.0
    1720 2.40 1.5 3.0
    1760 2.35 0.7 2.2
    1800 2.30 0.7 2.2
    1840 2.30 0.7 2.2
    1880 2.25 0.7 2.2
    1920 2.25 0.7 2.2
    1960 2.25 0.7 2.2

    There seems to be a large amount of timing pull for the load and the rpm I am in...

    Also at the end of the pull
    4240 6.25 6.0 6.7
    4400 6.35 8.2 6.7
    4560 6.45 8.2 9.0
    4720 6.50 8.2 9.0
    4880 6.50 8.2 9.0
    5000 6.50 8.2 11.2
    5160 6.50 8.2 11.2
    5320 6.50 10.5 13.5
    5440 6.45 10.5 13.5
    5600 6.40 10.5 13.5
    5720 6.40 10.5 13.5
    5840 6.25 10.5 13.5
    5960 6.15 10.5 13.5
    6120 6.15 10.5 13.5
    6240 6.10 9.7 12.7
    6320 6.05 9.7 12.7
    6320 6.05 9.7 12.7

    I read that anything over 6 was not good, then these numbers are quite dangerous...

    Also when I hir the limiter, and car shut off, I was able to re-start it immediately, but it was a bit scary...

    What should I go about this?

    Thanks!!

    Federico

  2. #2
    Active Member One Ring Rsniper4's Avatar
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    Nov 14 2016
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    Denver, CO

    I think easiest would be to check if the timing belt is or cam chain is worn. Additionally, the valve cams chain rides on a tensioner that can wear over time as well:




    All of these may contribute to timing problems.

    Vaccum and boost leaks may also contribute to timing discrepancy, since the MAF sensor and the O2 sensors send conflicting information to the ECU.
    If no air leaks are found, then check the MAF sensor and pre-cat O2 sensor.
    Lastly, if all those things are okay, then fuel delivery may be the culprit.
    A worn fuel pump, clogged fuel filter or dirty injectors may impede proper fuel injection and similarly will similarly force the ECU to adjust the timing. Watching the short term fuel trim may help you determine if fuel is a culprit.

  3. #3
    Active Member One Ring
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    Mazda Miata 93, Seat Leon, Audi A4 1.8TQM
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    Thanks RSniper4, will check into those, however....

    Fuel pump and MAF sensor were recently replaced...

    The O2 sensors I think they have never been replaced, so I guess its a good time to do so... Should I replace both? How about if I wanted to wideband, can the ECU read wideband without major modifications? Or should I save the Wideband for a gauge and that's about it...

    I have no idea if the fuel filter has ever been changed, where is it located, and how hard is it to replace?

    Thanks!
    Last edited by miatex; 09-08-2017 at 10:19 AM. Reason: typos

  4. #4
    Veteran Member Four Rings down_n_dapper's Avatar
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    Sep 13 2012
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    100415
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    Adelaide, AU

    Quote Originally Posted by miatex View Post
    Thanks RSniper4, will check into those, however....

    Fuel pump and MAF sensor were recently replaced...

    The O2 sensors I think they have never been replaced, so I guess its a good time to do so... Should I replace both? How about if I wanted to wideband, can the ECU read wideband without major modifications? Or should I save the Wideband for a gauge and that's about it...

    I have no idea if the fuel filter has ever been changed, where is it located, and how hard is it to replace?

    Thanks!
    Instead of throwing money at things and replacing them without knowing if they're an issue, start learning and watching videos on how to use VCDS. That way you can get a reading of the sensors health and determine if they need replacing.

    No you cannot simply put a wideband sensor in and have the ecu read it, you would need to convert to a later harness and ecu to be able to be wideband, just get a separate wideband gauge and start reading up on what other people have done.
    Maintaining a 12 year old Audi is about as expensive as Charlie Sheen's coke habbit.
    00' Silver B5 1.8TQM
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  5. #5
    Active Member One Ring
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    Mazda Miata 93, Seat Leon, Audi A4 1.8TQM
    Location
    Caracas

    Quote Originally Posted by down_n_dapper View Post
    Instead of throwing money at things and replacing them without knowing if they're an issue, start learning and watching videos on how to use VCDS. That way you can get a reading of the sensors health and determine if they need replacing.

    No you cannot simply put a wideband sensor in and have the ecu read it, you would need to convert to a later harness and ecu to be able to be wideband, just get a separate wideband gauge and start reading up on what other people have done.
    Thanks! I am on the tutorial phase! learning a lot...

    Thanks for the input on the WB...


  6. #6
    Active Member One Ring
    Join Date
    Nov 10 2015
    AZ Member #
    364288
    My Garage
    Mazda Miata 93, Seat Leon, Audi A4 1.8TQM
    Location
    Caracas

    Went back to the car today, and these are the codes that were stored...

    3 Faults Found:
    18010 - Power Supply Terminal 30
    P1602 - 35-10 - Voltage too Low - Intermittent
    16514 - Oxygen (Lambda) Sensor B1 S1
    P0130 - 35-10 - Malfunction in Circuit - Intermittent
    00561 - Mixture Adaptation
    14-00 - Adaptation Limit (Add) Exceeded

    And I also slowly revved the engine in neutral and as I approached 6000rpm the car stalled and a relay seemed to be ticking where the fuses are... I then restarted the car without problems...

    The same as when I was actually driving the other night...

    Is this thought process correct?

    O2 sensor faulty, then ECU has no Idea how much fuel to compensate with... starts adding fuel due to the difference in 02 sensor readings, until it says enough... Let me shut down and protect the engine?

    Thanks

    Federico

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