The timing is sat at 0° with the EST wire unplugged. I just did the Ultimate TBI mod, made the FPR adjustable and have it set at 13-13.5 psi a few days ago
HUH??
Chuck all that junk, get a MSD Pro-Billet ready to run distributor, a good coil and wires and make some power.
0
o timing? I really do not understand computerized engines.
Regardless, it still has advance weights in the distributor or no? If so make certain they work, if not....
If so, get someone close that's very good with distributor curves and have them recurve it for it for you. This requires some electronic gear that most folks can't afford. Or it can be done by trial and error by throwing different combinations of springs and weight weights in it till one works the best. I personally think the professional route is much easier. If the ECU does it then can it be flashed? I've heard some can and some can't. I really don't know myself.
Might have to ditch the gutless TBI as well. And go with an aftermarket Multi-point system. If not then a good MAS as an upgrade?
TBI's are so restricting on what can be done inexpensively. All the mods you have done will probably not amount to much if any real gain until you can convince the ECU they are good things.
Manifolds into a y-pipe into a muffler? No cat? What is the engine using to gauge the fuel mixture? That is the point of the ox-sensor in combination with all the other sensors. That is still present ? The truck will run SOOO much better if you reinstall a cat and ditch the muffler instead...it will sound good too. Just removing the cat will cause everything to go haywire. The system needs to work as a system. If one cog of a system fails the entire team falters. Sorry for all the mixed metaphors. As far as I know these still use the ECU to control the basics like spark advance, fuel timing, mixture, and other things. It was all pretty rudimentary in those dark ages however. Most of the ECU functions had subcontrols (my terminology) built into the vacuum system as switches. The basic programming in the ECU couldn't run a child's toy by itself back then. On my 86 Blazer (still had the carbed engine) I tried removing all that crap and ended up with a boat anchor in the engine compartment. Putting all the generals men back together again is possible but not on my wanting to do list. So I sold it to a buddy with full disclosure of the atrocities I had done. He said it would be a lesson for his teenage son to get all back together. They drove the bucket of rust for another five years before it nearly fell apart under them.
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