Hi Everyone
I'm having issues with my 1989 245 running rich , I have replaced MAS sensor, oxygen sensor, thoroughly checked for vacuum leaks, cleaned and checked Idle air valve adjusted the Throttle body sensor so it just clicks when throttle is applied, cleaned throttle body replaced air filter vacuumed dust in Filter box. replaced fuel filter
Original MAS Sensor stopped working after cleaning with CRC MAS cleaner, replaced this with EBay cheapie this got the car running again but still rich and would stall after driving for 10 minutes surprisingly the car would restart easily after stalling and would have to be very gentle with accelerator peddle to keep car running! , replaced this with a 'Good' used Bosch with the appropriate part no for my model( Thanks Dave) I have run the car with and without pre heat hose to filter housing, I have checked spark plugs they appear newish but are sooty as is the tail pipe. Some members have mentioned that the coolant temp sensor on the engine block can be an issue.
Thanks in advance