I have a '97 Ford Ranger, 6 cylinder. The stuff below only happens during the winter in Dallas which are not all that cold.
- The throttle has stuck open at about 45mph is 4th gear and would not slow down.
- On cool mornings the truck starts fine and the idle is fine. The engine warms up and the idle slows to normal. I go into the hardware store for 30 minutes and when I come out it is a little hard to start but it won’t maintain the idle speed and the engine dies. After a mile or two it is OK again. The temperature gauge on the dash shows the engine temp has fallen about half way from its highest to cool. This does not happen in the summer even though all the other indicators are the same. The engine temp can fall by 1/2 but the idle works so the absolute temperature of the engine can’t be it.
One time it never fails is when I take it to the shop and ask someone a lot smarter than me (and there are a lot of them) to check out the problem.
When it stuck open the shop thought the cables just needed a little lubrication but that did not appear to be the case and they could not duplicate the ‘stuck open’ problem.
Any help would be appreciated. The vehicle has about 110K and runs fine the rest of the time.