1990 745 GL, B230F, Regina ign, NA, automatic, no Cat, 180K mi.
A week ago began to run rough, I cleaned & gapped plugs - looked normal. I cleaned contacts on dist cap and rotor w #320 W/D paper. Runs better, smooth. 3 days later it started fine when cold, wouldn't restart when engine was warm, didn't even cough or fire. I put in a less used/worn clean cap & rotor. Installed new in-line fuel filter - ran the fuel pump (this car only has one, it's in the tank) while line was disconnected and the gas flow was strong. It starts cold, runs smoother, won't re-start when warm.
OBD codes are 3-2-1, 2-2-1, 1-2-3. I haven't found what they mean. Going by Bentley for '90 - '93 240 B230F codes, most relevant seems to be "fuel mixture way too lean or way too rich". So yesterday I cleaned the O2 sensor w spray - there was soot on it. Cleaned the MAP/AMM w AMM spray, and cleaned air intake accordian tube - neither was very dirty. Starts cold, runs smooth w almost full power - I tried to restart warm and it coughed twice and then was back to seem to be dry (of fuel). Three mos ago I removed and cleaned the oil trap. Oil & filter are semi-clean from recent change, AF clean enough, new plugs 1500 mi ago. Not blowing any fuses. Grounds look good. OBD codes remained the same.
Haven't changed the plug wires nor the O2 sensor in 8K+ miles I've put on it since I bought the car (not running) 3 yrs ago. Haven't checked the ECT sensor.
I've read FAQs - I will disconnect and clean all ground connections in engine compartment. I found: "No Hot Restart - Change the CPS/RPM Sensor". Also several ign system components are specific to Regina. Thinking I might need:
Plug wire set (Bosch for Regina)
O2 sensor (titania for Regina)
CPS (for Regina)
RockAutoParts has lots of info and choices, plus a wide range of prices
Feedback and advice please! I've gotta drive this car, or it's my International 6.9L dump truck.
Steve