The short answer is dad owned a garage and specialized in electrical and performance issues. We would send our heavy work to other shops and they would send their electrical work to us. I worked there for several years and am used to troubleshooting these systems. But it has been 32 years and I do not have access to the level of diagnostic equipment and resources we had then. It is slowly coming back as I work through this. (Like remembering the wire you disconnect to set the timing is behind the brake booster instead of near the distributor where the documentation says it is. )
Today I finally figured out it was losing fire. I had been thinking it was a fuel system problem. I put it back in the garage at that point so I could do some research.
The entire wiring harness, the electrical system (including the distributor), and TBI is from the 89 Chevy truck. So I am using the documentation for the 89 truck to work on it. The engine itself is from the 70s but that does not make any difference.
It has a digital dash and I am pretty sure the ECM is getting the speed signal from the same sensor.
The primary purpose of my post is to learn if anyone knows if the computer has a mode that would shut the engine off. Like going 25MPH in park. I don't remember in my previous life as a mechanic ever encountering that but I have never worked on a vehicle with a transplanted electrical system. I know I have replaced speed sensors but I don't remember a park sensor being bad.
Dad has had this truck since 1974. This is the second time it has been reworked. I would like to get it finished as he intended and sometime down the road I may start making modifications.
curtis
