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Just dumb luck really, Bob.
I wheeled the plane out this morning before starting on diagnosis. It ran up to 5300 as before, then started to spit and cough at higher rpms once it warmed up - so this was definitely a peripheral problem, not mechanical. Fuel pressure and mixture seemed constant and the symptoms felt too "sudden" to be fuel related. Coils have redundancy. Switching coils, ECUs and injectors made no difference. What is central to ignition? Hmmm. Crank angle sensor. I have the connections embedded in red silicone for corrosion protection. When checking under the cowl I touch everything. I pulled on each wire in turn. One came out of the silicone with very little resistance. I cleaned up the connection and resoldered it, then did more runups. No more spitting. There was no problem with the connectors themselves, but the pigtails were quiet short - probably insufficient strain relief. Today I got new connectors today from Mazda MPV vans at the u-pull-it junk yard - this time with long pigtails. (the identical connector is used on the MPV for something on the left as you look under the hood.
Bob Darrah wrote:
John, Just how did you figure out it was the crank angle sensor connector-what steared you in that direction? It's more efficient to learn from other peoples experiences.
Thanks
Bob Darrah
> Well it wasn't the coils after all.
> Florida humidity had gotten to one of my crank angle sensor connectors.
> Problem solved.
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