Well, one of the other "mature" mechanics at the shop I go to has some thoughts for Dave to get his DeSoto going. This fellow has worked in Africa, where you MAKE things work whether or not there are replacement parts available, and then in England (where cars hardly ever work, even with plenty of replacement parts) and then many decades on this side of the pond. He's seen a lot in his time. His thoughts are quoted below: "Dave has almost got every angle covered - mechanical wise I mean. Reading from what elimination process he has taken, the vehicle should start. It appears he has covered almost every thing he could think of (more than I would have taken anyway), except one thing which I think he has overlooked. I have personally experienced this very similar problem in my life time - it turned out that the exhaust system got plugged. I was in Africa at the time, and the wasps had built a nest of mud, completely choking the exhaust system. I would suggest to Dave that he remove the exhaust pipes from the manifold and try and start the engine, before going further with any more diagnoses. Reading from the report of what he has done, I don't see that the exhaust system was removed at all - it's worth a try. I don't think it's the valve timing, because one can verify if the valves have jumped, in any case, one or two notches fore or aft, the engine should still start, but will not run smooth. Dave's DeSoto has spark and the carburetor pump is pumping fuel - unless the fuel is stale. The compression is okay, so I can only guess the problem is in the exhaust system." While I haven't worked on such a car, I can say that I've seen it happen, in a different way. On a Brand-X car club tour I was running, our parade left the starting area, but without our Club President, who was supposed to be driving as tail-gunner. His car wouldn't start, so the penultimate guy stayed behind to help. Many cell phone calls later, they reported having gotten the car to start and run, but only after clearing all the sod and dirt out of the tail pipe, from where our illustrious Club President had backed into a nicely landscaped berm alongside the parking lot. Once that "core sample" was removed from the pipe, away she went! Dick Woodside
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