x2. It took me forever to tune Juddski's truck with the big LLY injectors, running off an LB7 FICM and ECM.
Just getting it to start and idle would have been enough to probably discourage 95% of the people from doing this swap. Maybe it was the big injectors, I dont know. But it was a PITA to tune. Idle problems, random sputtering and missing at some loads/RPM's, dead RPM area around 2,100rpm that the engine would die for a second before picking up again, etc etc etc.
Once I got it figured out it was fine....but if I had to do it all over again, Id probably just use an LLY ECM and set it up as standalone, with an LLY FICM.
Who knows, the LLY ECM might even communicate properly with an 01-02 cluster?????? We all know that an 01-02 TCM will communicate properly with an 03-06 BCM and instrument cluster, so Id bet my lunch money you could wire in an LLY ECM to the Class 2 bus on an 01-02 truck and the instrument cluster would still work properly and display coolant temp, trans temp, and fuel level correctly. (the only class 2 info that 01-02 clusters use, the oil pressure and everything else on the 01-02 clusters is with discrete "old school" signals)
So Russ. I bet you wouldnt even need a hybrid setup with two ECM's and stuff. Remove the LB7 ECM alltogether...and try hooking up the Class 2 data wire from an LLY ECM into the Class 2 data wire(s) on an 01-02 truck.......the worst that will happen is it just wont communicate properly. Its not like its gonna fry anything, that Ill guarantee.
Class 2 is Class 2. J1850 VPW. Its the same databus specification/language on the 01-02 trucks as the 03-06 trucks. Its just used much more widespread and 3x the amount of body modules communicate on the common bus in the 03+ trucks.
ben
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