1999 VW Cabrio keeps dying but is fine after sitting for an hour. Mechanic is baffled.
My 1999 VW Cabrio dies on a regular basis. Almost exactly an hour later, it will start right up no problem. It dies pretty randomly, but always when I'm going slowly, under 25 MPH. Often it happens when I'm going up a slight-to-moderate incline. Today for the first time, it died while I was sitting at a red light. It used to die maybe once every few months, but it's happening more and more lately. This week - twice. In the last couple months, 6-7 times. My (non-VW-specific) mechanic was baffled. I think the oddest thing is that it will be dead for almost exactly an hour every time, like clockwork. What could the problem be? It's not the battery, starter, transmission, belts, or hoses. It's not overheating.
My guess is ignition coil. They heat up and change the geometricks within the coil. Shorting out. When the coil cools a bit will work fine.
The engine is not overheating, or have you determined that the ECM is not overheating. possibly, just possibly the ECM will fail when it is warm, and after that hour when it cools it will be OK. That can happen. Actually that is a longshot, but something to consider
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