As far as breaks in the wiring, a continuity test showed all wires to be good. I don't know if an ohms test was conducted or not. I tapped up all the wires very carefully. Finished getting everything back in place this evening. Started the car and I knew right away that it was not fixed, the engine sounded rough/not the normal smooth idle. Sure enough, within a minute the CEL lit up. I jump the OBD connector and got Code 18.
According to the GM Shop Manual:
With the engine running, the PCM monitors the cam and fuel control references pulses it receives and expects to see six fuel control pulses for each cam pulse. If the sequence of these pulses are not correct for 10 occurrences, DTC 18 will set indicating an intermittent problem with the cam signal or the fuel control signal.
DTC 18 indicates an intermittent fault and may not set immediately or under all conditions. ... A poor connection or fault in the cam sensor CKTs 630, 633, 644, or 645 or a faulty cam sensor may cause the PCM to reinitialize injector sequence when the fault occurs, causing a possible stumble or miss. A poor connection or fault in the fuel control CKT 430, crankshaft position sensor CKTs 643, 644, or 645, the 18X portion of the crank sensor or bent or missing vanes on the harmonic balancer interrupter rings will cause the PCM to stop pulsing the injectors when the fault occurs causing an intermittent stumble or stall.
Since I first got the Code 18 I have changed out both the CAM Sensor and the CRANK sensor; both are AutoZone Duralast sensors. I was sure that when I saw the condition of the wires in the ICM harness that I had found my problem. It could be in the crank sensor connector; to plug it in, the wires have to bend at an angle.
I have tested the ckts described as best I could. There is no easy way to test the crank sensor signals as they go to the ICM unless I used some kind of wire piercing thing.
Please read through the GM Manual excerpt and see if you can give me any advice on how to discover the source of this problem.