Originally Posted By: TallPaul
My '95 F150 4.9L is very hard to start in hot weather if it has sat very long (say 30-45 minutes or more) in the hot sun. On the same type of hot sunny day, if I park in a garage, it starts easy. Also starts easy in the winter. (This has been going on for several years.) The other day I thought to try something new after it sat in the hot sun, so before I tried starting it I lifted the hood for a few minutes. Remarkably, it was easier to start. What could it be? It seems that too much heat under the hood is causing the problem, but how? Some part must be defective. But what?
These hot start issues can drive you nuts! I get a surge on a hot restart, had it for years, had some of the best mechanics look at it and till this day I have not resolved it. If you haven't checked the Air temp sensor, and Coolant temperature sensor, do so, and while you're at it any sensor that monitors temperature. Check for vacuum leaks, IAC, TPS, O2 Sensor, you name it. That was my condensed version of what I've done. In some cases the computer might think its cold when its hot, or hot when it's cold. If you find the problem give me a shout!