I think I have finally identified the cause of my crank but no start condition.
I tested the fuel pressure at the fuel pressure port by jumpering sockets 30 and 87b at the DME relay socket and the fuel pressure with the fuel pumping running was fine at 36 psi, and pressure was adequately retained with pump off, indicating that the FPR is fine too.
As noted above the measured resistance of the CHT sensor at 2.5k ohms was within spec. I finally measured the resistance of the speed and reference sensors. The speed sensor, which is the middle one, measured 965 ohms, so within spec. The reference sensor, which is the bottom one, resulted in an OL reading on multiple attempts. As you can see in the picture, on the bottom one, a portion of the end is missing, exposing wires. This is also consistent with my observation that the tach wasn’t moving at all, when I last cranked the engine without it starting.
Thanks for all your help, and I’ll let you know how my replacement of the sensor turns out.
