One time, a guy brought in a car claiming that it stalled every time he put it in reverse. Sure enough, it did just that! Service writer thought it was a transmission problem so it ended up in my bay. After looking it over, I figured it for an electrical problem.
I could duplicate the problem, but I could not get to where I thought the problem was while it was acting up. I finally had a helper in the car while I was under the hood. It turned out to be a bracket that was plastic coated and supported the wire harness had a bad spot in the insulation. When it was put into reverse, the engine moved just right to short out something in the wire harness to stall the engine.
I had others that were even more bizarre. One car had an issue when it was cold, it would miss. No codes,no other indication of problems. Once it ran for 30 seconds, the miss would go away and it would not repeat until it was overnight cold again. Turned out to be the delay module for the windshield wipers was causing RF interference that was just enough to affect the fuel injection when it was in open loop. This was solved by Ford engineering department. That was way beyond the scope of a dealership mechanic. Changing that module with a revised one solved that problem.
Good luck with your gremlins. Some times, they can be really tough to track down and solve.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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