AYSZ bin

[rr]

Well, not seeing the bin I can only speculate. There may be a slope variable
to extend ignition timing. Sometimes the PE SA can be from a table that
goes to 6400 rpm.

The same may be true for the VE%. Haveta' look at the whole bin. Have
you found any engine speed limiter? That would be a tell-tale sign of intent.

BobR.

Jeremy Gonyou wrote:

> First, would anyone like a copy?
>
> This is a junkyard find from a Lumina Z-34, 3.4 V6 DOHC.  Looked to be of
> 93-94 vintage, but hard to say.
>
> Looking at the code I've found something of deep concern:  Whereas most code
> has an rpm variable that goes up to 4800, AYSZ has a similar variable, but
> it only goes to 3600 rpm.  This is the variable that is used to lookup up
> the main spark advance and VE2 (VE2 normally goes to 6400 rpm)
> Sooo... it appears to me that GM is treating the engine the same whether it
> is revving at 3600 or *twice* that.
>
> I've heard rumors that they backed the engine off to save transmission life,
> but I've always dimissed them as wishful thinking ...
>
> Any insights ?
>
> Thanks
>
> Jeremy

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