My 87 2,8 S10 Blazer's catalytic converter glowing red. I do understand that when this happens, that it's because it's running rich. Ran great until I had first converter meltdown. Replaced converter, map sensor, O2 sensor, dist cap, plugs wires. Checked cleaned egr valve, checked egr system (ok). Compression, engine/valve timing, vacuum well within specs. Does seem to foul plug(s) on passenger side only. Exhaust seems clean, no fuel odor. Took to garage and had diag run on it, was told everything was ok except the injector on right side had no particular spray pattern and dumping fuel in and needed to be replaced. Replaced injector, did not solve problem. Checked all wiring, OK, each inj is being pulsed as checked with my RS digital logic probe. Have read forums about fuel problems and tried their suggestion. Did discover that maybe my temp sensor might be bad. Now here the weird part, I unplugged the temp sensor while engine was running, converter glowing and detected a slight change in the engine, the service engine light came on (expected) and the converter began cooling down, let it run for about 2 more mins, converter was not glowing, but did smell strong odor of fuel, exhaust smoke was black (running rich). My delimma, if the engine was in a rich state, no fuel odor, converter glowing, then why, when I removed the plug on the temp sensor did it cool down when it seemed to be really running rich??? I'm lost, but going to replace the temp sensor, o2, and map sensor again, as well as plugs wires, cap. Anybody have any other ideas, other than the junk yard..
