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Thread: $EE Cylinder ID

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  1. #1
    Fuel Injected! Terminal_Crazy's Avatar
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    $EE Cylinder ID

    Evening guys,
    I've not had a propper play yet with my motor as i've been on call this weekend.

    However as was ildly musing i remembered i'd seen a parameter in Steveo's EEHack listing cylinder ID.
    I was thinking of mapping Map vs Cyl Id to spot any trends.

    Well i've just sorted a csv and found 10 cylinder Id's listed ?
    45
    46 47
    56 57
    66 67
    76 77
    85

    The middle 8 looked quite promising but the two end ones threw me.

    Any explanation on these?

    Thanks
    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  2. #2
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    The first digit is important the second can vary.
    order is like this

    4*,8*,5*,8*,6*,8*,7*,8* {cyl# 1,8,4,3,6,5,7,2}
    4 is current firing cylinder number #1, and the order is per brackets.

  3. #3
    Fuel Injected! Terminal_Crazy's Avatar
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    Quote Originally Posted by kur4o View Post
    The first digit is important the second can vary.
    order is like this

    4*,8*,5*,8*,6*,8*,7*,8* {cyl# 1,8,4,3,6,5,7,2}
    4 is current firing cylinder number #1, and the order is per brackets.
    Sorry, I don't follow that, ( I do but ...)
    Am I missing something or had the GM guys been smoking some weird S*** ?

    As I can see so far,
    4=cyl 1
    5=cyl 4
    6=cyl 6
    7=cyl 7
    8=cyl 8,3,5 or 2

    This lines up with the banks of a 2 plane manifold, don't see how that would fit with anything here.


    On the last log I had (Needs a Non Proprtional Font to view properly)

    At Startup
    Rpm 45 70 100 107 280 688 1063
    Cyl Id 0 77 77 86 67 47 86 66 76 57 86 86 86 86 66 86 66 86 76 86 86 86 86 76 47 57 66 86 86 47
    Cylinder 7 7 6 1 6 7 4 6 6 7 7 1 4 6 1

    Consecutive logs idling
    Cyl Id 86 86 86 86 47 86 77 47 86 86 47 57 86 86 57 67 86 86 67 77 86 67 86 86 67 86 77 47 86 86 86 86 77 47 86 86 47 57 86 47 86
    Cylinder 1 7 1 1 4 4 6 6 7 6 6 7 1 7 1 1 4 1


    Since I have no idea how many frames have been lost between each frame I've received, how would I tell which cylinders are represented by the 8x's
    Why would the units column change if it doesn't represnt anything ?

    Thanks
    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  4. #4
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    The number represent degrees between low resolution falling and rising edge.
    It follows engine firing order. It is used for opti diagnostics.
    If you look at an optispark wheel you will get a better understanding.

    Frame lost is huge here.
    At idle you need at least 50 frames per second and 400 fps at 6000 rpm.
    Only direct memory access can provide that resolution, or a factory GM debug tool.

  5. #5
    Fuel Injected! Terminal_Crazy's Avatar
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    Quote Originally Posted by kur4o View Post
    The number represent degrees between low resolution falling and rising edge.
    It follows engine firing order. It is used for opti diagnostics.
    If you look at an optispark wheel you will get fa better understanding.
    Ok, haven’t got one to hand but presumably the leading edge of the large low res slots are 90^h^h. 45 degrees apart on the wheel so 90 crank degrees apart
    And the width of the slot in degrees determines the cylinder.
    Are the 4 8x slots the same width then? To distinguish these 4 cylinders.

    _IF_ that’s so, why have I got 10 different values in the log?
    I was going to say “timing error” but don’t we have the high res signal for that?

    Frame lost is huge here.
    At idle you need at least 50 frames per second and 400 fps at 6000 rpm.
    Only direct memory access can provide that resolution, or a factory GM debug tool.
    That's my Point.
    Without any reference to a preceding frame, Can I tell which cylinder i’m Looking at?

    Apologies. Not being an arse, just trying to understand it.
    Thanks
    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  6. #6
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    To identify the same width cylinder you will need to know the previous one`s id.
    Second digit can vary +-2 degree from midpoint or x4-x8. Midpoint is x6
    Actually this number is high resolution counts, but I guess PCM don`t count that fast at rapid rpm change. Or there are some built in tolerance protection for pcm to through fake code.

    By monitoring these cyl id you can identify bad opti signal.

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