Originally Posted by Frost
That is not consistent with any type of PCM failure that I have seen before.
I know this is an old thread, but what are the typical symptoms of PCM failure?
One day I drove my T/A home (stock PCM), waited 30 minutes and then it wouldn't start (crank, no start) when I went to leave. I went around making sure the grounds were tight, checking fuel pressure, and then one time after not changing anything, it starts. Started fine the next dozen times, moving it around in the driveway. A few days later, confidence rebuilt, it left me stranded on the side of the road a few miles later. It just died and cranked but wouldn't start again. Trailered it home and sure enough, fire up right away getting it off the trailer and ran fine. There goes any diagnosis.
Last night, it starts fine and I was poking around under the hood. "Feels" like an electrical fuel issue. I gave the PCM and surrounding wires a wiggle and it died, wouldn't restart. YES! Moved the PCM/wires, starts. Unwrapped the wired from the loom to the PCM and didn't see any chaffing or exposed wire. More wiggling and I couldn't get it to die again. Got dark, gave up.
I'm 90% it's going to be a broken wire or chaffed wire I've not yet discovered. HOWEVER, there are some other slightly odd things that happen and want to rule out the PCM. For one, after a minute or two sitting at a stoplight or whatever, the fuel gauage will drop to zero for a few moments, sometimes until I start moving. And then, when it started on the trailer, I noticed the tach read zero RPM's for five seconds or so when it first started.