Can you do a data log, does sound like the opti. have you driven the car? if the optical side is bad, then the ECM isn't advancing the timing. It will pop without setting a code, if you drive it under load then you'll most likely get codes set.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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