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Car usually just sit in driveway ,I always start the car at least once aweek. started driving recently and the engine just stop,running waited awhile tried starting would'nt a few hour later it did drove for awhile it stop again
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Sputtering is usually a sign of having a fuel issue. You need to hook a fuel pressure gauge to the fuel rail and confirm that you have at least 40# of pressure at the rail.
Sounds like the crankshaft position sensor needs to be replaced. They are a common problem with the Mercedes. That sensor is the one that the engine control module looks at to see if the engine is running. When they get hot and stop producing a signal the engine control module thinks the engine is not running and shuts of the fuel. After waiting awhile they cool down and the vehicle will start up again. I've changed many of them when I worked at the dealer. Tricky part is when there working and the car is running there will be no check engine light on or code stored. Usually will only have the code when the car won't start. Let me know what you end up finding out on it but that would be the first place to look and probably the cheapest.
Do you have a Wankel engine in you car? Then you have a flooded engine. Pull the fuel pump fuse or relay and crank the engine over......until it starts then stops. Now put relay or fuse back and start. You cannot start and stop a Wankel in a Mazda RX when it is in it's cold mode and restart it easily. Always run them for at least 10 min before shutting it off. The other way to start after flooding.....is wait a day.
check the fuel regulator,while running unplug the red vacumn hose and if gas squirts out the hole,then it is bad,if not then possibly plugged catalytic converters,drive it on the highway if you can, and stop and look underneath at it and if it looks red,then replace them.Check to see if its overheating,usually a really hot hood tells the story.
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