need help

[turboant]

91 b2200fi and what kind of problem do you get with a ecu going out becuse my truck run but with a lot of black smoke coming out of the tailpipe

[bfg2200]

black smoke mean running to rich ck fuel pressure and pressure regulator also see if any codes in computer also check o2 sensor and coolant temp sensor

[mazdatech]

if what bfg2200 says is all ok then if the ecu is suspected i would check you 5 volt reference signal from ecu i usually check at temp sensor not gauge driver on tstat housing the one under your intake rec looking at etm for correct pin