fuel or ecu

[burb_n_coach]

First of all I'd like to say i have viewed this site for a few months and have seen alot of good information on here. I now have a problem that i have found no answers to. I'm currently working on my sons 89 s15 jimmy 4.3 tbi. We bought this with a bad motor and installed a donor. The engine starts fine and runs strong considering the injectors are not misting, but putting out more like a rain forrest..(exhaust is very rich with soot). This was a problem with the preprevious owner i later found out. The tbi has new injectors, o rings ect. new o2, egr and various other sensors.

Am i right in thinking this a fuel pressure issue? The pump works and cuts out with key in on. Maybe plugged filter? (still working on the michigan salted fittings)

Any comments are most welcome. Thanks

[burb_n_coach]

ok, day three of useing penitrating fluid on the fuel filter lines. The engine control unit (module) trigger for the injectors seems to be working fine and i have 12.92 volts showing at the injector(little shy of the 13.8) I'm in the process of trying to come up with the fittings needed to check the fuel pressure.

I am also wondering if anyone knows where i might find a flow chart or ladder diagram of the electrical systems used in the tbi vehicles.