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 - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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