870 Spark Control

[Matt Sandine]

Yep, the wiring all checks out, but tomorrow I am going to check to make sure the ECM is receiving a voltage above 8 volts from the ESC. Evidently when this signal wire drops to 6 volts or less, the ECM starts to pull the timing out. Maybe it is 0 volts for some reason even though the wiring checks out so far and no code throws. At 0 volts, I assume the ECM would be full retard which could most definatly be what I am experiencing. If my car wasn't so loud, I would be checking it tonight. Thanks, Keith. -Matt-
    -----Original Message-----
    From: Keith D. Miller <kdmiller at westnet.com>
    To: gmecm at diy-efi.org <gmecm at diy-efi.org>
    Date: Friday, May 11, 2001 10:31 PM
    Subject: RE: 870 Spark Control
    
    
    20 degrees is the max retard for an ESC module, have you checked to be sure
    the ESC or wiring is not bad, signaling the ECM to retard?
     
    Keith
    --

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