870 Spark Control

[Keith D. Miller]

> -----Original Message-----
> From: owner-gmecm at diy-efi.org
> [mailto:owner-gmecm at diy-efi.org]On Behalf Of Matt Sandine
> Sent: Friday, May 11, 2001 11:53 PM
> To: gmecm at diy-efi.org
> Subject: Re: 870 Spark Control
>
>
> 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-

Don't rule out a bad sensor. If you disconnect the lead to
the sensor, the ESC should act as if there is no knock.
I assume you checked the ESC ground?

Keith
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