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Re: TPI cold start injector ?
The cold start injector is a totally independant system (no ECM function). It uses the thermotime switch located in the front of the intake manifold next to the coolant temp sensor. The switch activates when coolant temp is below 95* F and runs for up to 8 seconds (depending on actual temp), which triggers the coldstart injector.
What I did was disable the cold start system and reprogram my chip with a modified version of the ARAP .bin file (1989 Corvette program) and did further scans and reprograms to fine tune it. The ARAP .bin doesn't use the cold start injector, enrichment is handled by the ECM using the engine's injectors.
With the bigger cam and displacement your O2 sensor is probably reading quite lean, so the ECM is dumping fuel in to try to compensate. You need to get a scanner on it and see what the BLM's are reading. A BLM of 128 is optimal, higher than that is lean, and lower is rich. The leanest it can read/indicate is 160 and the richest is 108. All of this is done in closed loop mode.
A question...what injectors are you using?
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