[Gmecm] DFCO/DCFE and VSS

[Cowen]

Mark,
I don't know which broadcast code I'm running (1991 Pontiac 6000 3.1l station wagon donor), but I am 100% sure DFCO works without VSS.  It's pretty obvious with the exhaust I have when the fuel shuts off, and there's no question about the change in decel rate when it comes back on.  

Is it possible my optical VSS (which is actually hooked up) is sending a wrong but useable signal to the ECM?  This ECM should have the magnetic VSS, and I'd assumed (because it pulls VSS codes) that it's not reading the optical VSS at all...

It seems likely that Dozier has it right, at least for my ECM...
 
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