My truck is a '92 4x4 S10 with a semi-modified 4.3L hooked up to a 700R4. The 4.3L's top side mods include '96 Vortec heads and Edelbrock 2114 intake with a carb-to-TBI 1-inch adapter. Since the Edelbrock intake does not accommodate an EGR, I need a way to eliminate the EGR. Also, because of the slowness of my 16144288, I wanted to upgrade to the faster and "tuner-friendlier" 16168625.
What I have done so far is captured in a prior thread...below
http://www.gearhead-efi.com/Fuel-Inj...168625-TBI-PCM
Last week, I installed the adapter I made which is based on information found in several threads on this site, specifically one entitled "1227747 to 16197427 Conversion PCM Swap with Wiring Pinout Directions!" With the 8625 installed, my engine will start when I prime it with starter fluid/pour fuel into the TBI but will not run continuously. It appears no fuel is reaching the TBI. Prior to swapping in the 8625, the engine ran properly.
I have run diagnostics circuit checks at the fuel pump relay and determined that the fuel pump is NOT receiving the 2 second priming and the fault is between the FP relay and the ECM. Through continuity checks, I've eliminated that the problem lies in the stock harness and my adapter. I am able to trace continuity up to pin F6 in the plug for the 8625. Based on the aforementioned thread, pin F6 should be the source of the 12V for the fuel pump.
Any help or insights will be greatly appreciated!
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