The truck died (92 RRC, 3.9L) while idling in my driveway and would spin but not start. I checked for spark at the plug and found none. I got a weak spark from the coil and some odd voltage readings when testing so I replaced the coil. Still no spark at the plug. Further testing pointed to the amplifier module. In order to replace the Amplifier Module on my '92 3.9L, I had to remove the distributor (not enough room to access the mounting screws).
I made all the appropriate markings before removing the distributor from the engine. After replacing the module I dropped the distributor into place without much effort. All the marks aligned perfectly. Re-tightened. Re-assembled. The truck would spin but still not start so I performed the rotor arm test (Rave) which indicated an earth fault on the rotor arm. I replaced the rotor arm (which was only a few months old) and reassembled, ensuring plug wires were in the correct order to the distributor cap (which was also replaced at the same time as the rotor arm).
The car fired right up but a terrible screech started. I killed the engine. Rechecked things under the hood and retried. Same terrible screech. This screech is new. In the brief moment I had the truck running the second time, it sounded like the screech was coming from the drivers side of the engine, possibly in the area of the alternator. Of course, the distributor is in that same general vicinity. It sounds far far worse than a belt screech, and all the belts were just replaced several months ago. When last the car was running in my driveway a few days ago there were no bearing issues under the hood.
The only thing that really changed under the hood during this (electrical) repair was the existing distributor being removed/returned to the engine, the amplifier module, the coil and the rotor being replaced. Everything else was functioning normally.
So far I have pulled the distributor cap and do not see any signs of any issue.
Given what was done any thoughts on the screech?