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 - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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