Car starts and for 5 mintes then shuts down and won' t start for awhile

If your talking about heater blower motor turning on and off, have to check voltage and ground while problem is ongoing.
Need year--make--model to look up wiring diagram?

Blown head gasket causing loss of compression ?

It may well be a cold start injector/air meter/sensor at fault.
Don't waste time and money changing things to cure the problem. The cheapest way is to take the car for a diagnostic check. They should be able to identify the fault immediately. You can then save money by rectifying the fault yourself ..

check fuel filter, maybe have some debris that sometimes clogs

bad wire or conection better take it to the best elec guy you know or shop

For car starting and running issues troubleshooting.Click the link below :----

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

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This will help.

Thanks.

Does it crank?If you shut it off and you restart after a few minutes and it cranks but won't start or starts and runs rough the injectors are leaking and flooding the engine. Need better description

Hi your problem sounds like the battery is gone and won`t take a charge. When your engine is running the alternator is supplying the electrical power to run the car ( and normally charging the
battery as well )
Even though it seems strange for the battery to go suddenly, it does happen.
How old is the bat. Most last about 5 years with normal driving ( batterys last longer if the car is used every day )
Anyway i hope i have been of some help to you.
John (south Wales UK )

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.

use a timing light to test for spark
have spark: timing belt broken