i was running the craig moates scanner on my car logging during a 1/4 mile run and i notice a problem. during the WHOLE run im getting from 5.5-8.5 degrees of spark retard due to knock. the problem is my timing is dead on 0 degrees TDC, and my o2 sensor was reading ~.900 mV the whole run so i wouldnt think im running lean its a 89 iroc L98 ported stock base, stock chip

 

What does this have to do with burning your own chips ?

Post it on the General Tech board or the TPI board.

 

im looking for advice to see if i should take timing out of the chip across the whole rpm range or just general advice on how i could fix this.

 

If the chip is bone stock and the timing is at 0 then you have other problems. Maybe a huge vacuum leak or a bad ignition module in the distributor.

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1992 Z28 5.7 TPI

ZZ4 longblock
Harland Sharp roller rockers
Accel base and SLP siamesed runners,
52MM SLP Throttle Body
Hooker Headers & Flowmaster catback
MSD6A ignition
aluminum driveshaft
World Class 5-speed