GM ECU spark table?
I've got an ECU I'm going to use GM #16198262 and it has a custom chip in it for a 502ci crate engine. The harness it came with doesn't have the wires connected for a GM HEI/EST (computer controlled electronic spark timing with external coil) but I know the functionality is available for the entire series of ECU's but the custom chip maker (unknown) may have nulled the spark table(s) or it could be for a small block or other engine that doesn't require as much advance.
How do I test for spark advance functionality without using an eprom reader? Is there a good website out there specifically for GM EFI applications? I've only managed to find little bits and pieces.
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Last edited by sweetblue69; Nov 10th, 12 at 11:10 PM.