Hiya fellow Brickers. I have a 91 745T, which I purchased not running from a local used car dealer. I have been through the car thouroughly, and am at the point where the car will start, but won't go over about 400 RPM. My car is equiped with the Bosch LH-2.4 Fuel system & the Bosch EZ-116K Ignition. Here's my question. While testing wiring, voltages, etc., I have found that the Yellow wire, which goes from term.# 25 at the fuel ECU, to term.#8 at the ignition ECU, has 0 voltage with the key on, engine running or not. Does this indicate a bad ECU, or does this voltage (load signal) originate at the AMM? Since the engine starts & runs, but acts like greatly retarded timing, I believe this load signal will allow the Ignition ECU to provide spark advance to run the engine. The car has 136000 miles on it, 44 lb. fuel pressure at the rail, has spark, complete major tune-up, including fuel filter, 145 lb compression per hole, all new vacuum hoses, new power stage, throttle sensor, coolant sensor, and more. Any advice or suggestions would be GREATLY appreciated.
Thanks in advance.
Ken