Tbi swap build thread

[rfmaster]

Originally Posted by dju91001

I was under the impression due to an anti theft program or something in the ecm. If not, great! It should work. The rest of the drivetrain is 73-74 blazer with turbo 350. I know about the vss, the park neutral switch, and the detent cable. Going to use the caprice fuel cell with pump unit and lines. The schematics are all similar, so i've found. The cab and bed are 70 c10, just dropped onto a blazer chassis. Thanks

Yes, the 92 'may' have VATS anti-theft system. Check ECM I/O connector pin B6 which is input from VATS module. Two ways to get around it. First is to burn a new EPROM that disables this function. Requires some cash outlays for EPROM PCBA adapter, EPROM (or FLASH memory chip) and burning equipment or knowing someone to do it for you. Second approach is to build a 30 Hz pulse generator to provide 50% duty cycle pulse signal to pin B6. Once ECM sees this pulse signal during cranking it enables fuel injector driver circuits. Alternatively, find 1227747 ECM from 305 truck and use it as is - trucks did not have VATS system. The 7747 ECM will plug into Caprice harness and will work fine. I presume that you are going to omit AIR pump - it is only used during cold starts and later trucks did not have AIR system.

//RF