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Great advice @Will L. . Thanks.

@WarWagon, I'll see if I can find anything newer that references the use of the cruise control unit. Re: the wiring harness: I don't know if something is wrong. Continuity checks out. Visual check didn't show any issues. The PMD smoked from over-current, surely. It was not a "normal" PMD...

Thanks, I'll get in touch with him.

I hear you. I read through the DB2 Conversion Guide by Bobbie Martin this afternoon. Definitely giving it some thought. But, at the moment, I'm thinking plug and play sounds better than making this a hobby vehicle.

@JMJNet , do you have a source for the harnesses? I checked Quadstar (referenced in the other thread that addresses smoked PMD) but they're sold out of their "over-the-intake" harness. GM doesn't carry, apparently. No hits on any of my normal go-to parts sites either. I did find someone...

Thanks. I was referring to his comment about the plunger. I had an aha! moment when I realized he and Rockabillyrat were talking about the internal fuel solenoid possibly frying the PMD drivers; not the shutoff solenoid, which is what I originally thought they meant.

Okay, so you and Rockabillyrat are talking about the internal fuel solenoid? That is the one that received the signals from the PMD via the red and black wires under the boot, right? I don't know much about the magic that happens inside the IP. Automatically assumed he was talking about the...

Checking the fuel shutoff solenoid was in the troubleshooting guide I used and I pulled it out and tested it to 12v. It plunged properly. One thing that doesn't make sense about the low fuel flow explanation is that the engine ran away at first. Not a full throttle runaway, but it wanted to...

PMD was in the original location when it went up in smoke. Clearly overheated but I'm wondering if there is some other failure mode besides electrical shorting that could cause it to get that hot. Fuel level was definitely 1/4 tank or less, don't remember exactly. But you seem to be heading...

I had nearly the same symptoms as detailed in this thread: https://www.thetruckstop.us/forum/threads/smoking-pmd.48938/ Engine ran away, wouldn't respond to throttle input. Smoke and burning smell from the PMD. 4-year history of occasional stalls with immediate restarts and also fishbiting...

I'm in the middle of a similar troubleshooting process. My next step is pulling off the intake manifold to go through the valley harness. Are there a lot of inline fuses/fuseable links to check?

Thanks for detailing this failure. I had these exact symptoms on a 94 Suburban. Nobody would believe my PMD was smoking. The truck sat for a while and I'm just now getting to it. Anyway, this thread will be really helpful in tracing my issues.