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  1. #101
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    Click here to enlarge Originally Posted by vasillalov Click here to enlarge
    True, but in addition to that, in order to get individual cylinder knock events, the DME examines noise signal from the spark plugs themselves.
    I fully agree... In fact the DME use that spark plug "noise" to detect ignition / pre-ignition / misfire.

  2. #102
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    Click here to enlarge Originally Posted by vasillalov Click here to enlarge
    True, but in addition to that, in order to get individual cylinder knock events, the DME examines noise signal from the spark plugs themselves.
    I don't see how... Look at Terry's diagram. People got this idea about plug and/or injector monitoring from a very vague source in my opinion. Im skeptical.

    Edit: indivisual activity is just based on what cyl is firing at that time.

  3. #103
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    Click here to enlarge Originally Posted by JoshBoody Click here to enlarge
    I don't see how... Look at Terry's diagram. People got this idea about plug and/or injector monitoring from a very vague source in my opinion. Im skeptical.

    Edit: indivisual activity is just based on what cyl is firing at that time.
    Well its assumptions but I think good one because the DME has codes for:

    - Spark duration too short
    - Combustion misfiring, damaging exhaust gas after start sequence
    - Combustion misfiring, cylinder X: Fuel injection deactivation (X being 1 to 6)
    - Ignition circuit, supply voltage: Bank or engine failure. The diagnostic function simultaneously monitors the spark duration in all cylinders.
    - Ignition timing adjustment in idle, cold start Ignition timing too early
    - Combustion miss, cylinder X: Spark duration too short

    And measuring current from spark power wires is easy to do while comparing with firing order within the DME.

  4. #104
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    The DME does measure current to the coils it appears, as when doing a 2step we can induce cylinder specific ignition faults by cutting power to the coil of a specific cylinder, but I don't believe it is related to the knock detection system or advance targeting.
    Last edited by Terry@BMS; 04-12-2012 at 12:24 PM.

  5. #105
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    individual cylinder monitoring is a great addition to the procede. shiv's not using up 6 inputs for this feature, however.

    i think this would be a good addition to the jb4, as well. i'm especially curious about how the jb4 logs would look, since they're running the stock ignition timing.

  6. #106
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    1 out of 1 members liked this post. Reputation: Yes | No
    It's been suggested for probably 2 decades that coil on plug ignition could send back voltage/resistance readings to the ECU from each plug but I'd think you'd have to have some pretty decent ECU logic for determining the state of the plugs to account for wear etc for this to be accurate enough to use for fine tuning vs significant anomaly detection (eg preignition, misfire, etc).

  7. #107
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    And just to throw this out there, I've seen multiple instances where a stock tune will pull timing on certain cylinders. 93 octane, N54 and N54T. So a little bit of correction is expected and not going to cause critical damage.

  8. #108
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    ^this is true. i've seen this happen on "stock" tune setting on procede and cobb

  9. #109
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    Yep, its definitely there. The ECU adjust timing based on a lot of environment variables.
    From all the things I've lost,
    I miss my mind the most!
    Click here to enlarge

  10. #110
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    Click here to enlarge Originally Posted by themyst Click here to enlarge
    Knock sensor activity can be logged under "knock volt"
    Any idea on how to interpret that voltage as indicator of an issue?

  11. #111
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    Click here to enlarge Originally Posted by bv1 Click here to enlarge
    Any idea on how to interpret that voltage as indicator of an issue?
    Yeah if the voltage abruptly rises and there is a timing correction to go with it, that's the ECU suppressing a KR event.

  12. #112
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    Click here to enlarge Originally Posted by themyst Click here to enlarge
    Yeah if the voltage abruptly rises and there is a timing correction to go with it, that's the ECU suppressing a KR event.
    Thanks man, just chasing around some part / mid throttle timining corrections while driving around normally logging with the Cobb AP (-3.0 degrees or so). WOT and under load things look ok. From what I've read
    I think I'm ok if WOT logs look ok.

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