Sniper EFI + Dual Sync - No Spark (was a driving truck)

[KyleSeal]

Originally Posted by Shifty One

Did they mention potential reasons for the failure?

Originally Posted by RustyPile

X2.. That question screams to be answered.. I hear/read this complaint about Holley not offering a flow chart or diagnostic procedure for their Sniper systems. "well, it sounds like the XXX is broken"... Every experienced mechanic knows that guesswork is not a diagnostic procedure..

KyleSeal, did the Holley Rep offer any steps that will verify his guess prior to buying another ECM??

The rep himself did not really offer any extra means to diagnose - but as you can see I did do quite a bit myself before calling.
I think the warning signs for me were an erratic IAC, and killed an O2 very early on.
The main 'diagnosis' that lead me to believe the ECU failed is that the white wire, when grounded, will create a strong spark at the distributor. Since the Sniper controls spark when using a dual sync distributor, this would indicate either a dual sync dist issue, or a Sniper issue, and since the handheld shows RPM when cranking, indicates the Sniper is at fault.

But - come saturday, I will have the Sniper 2, and will update if it runs at that point.