My car starts fine when i first start it. After a drive to somewhere I park and turn it off when i come back it wont start. It would just crank but wont turn over and start at all. I would have to wait anywhere between 5 to 30mins before it would start. Lately it has turn off when i come to a complete stop. I know i dont have any issues with it at all when i first start it for the day but only when i turn it off then i will have issues with it through out the day. what can it be hopefully its something simple that i can do. Dont really have the money lately to take it in.

 

Get the codes read.
If no codes it stands a chance that it is the CPS Crank Position Sensor which don't like heat and start to operate intermittently.
Usually impacts V8 however.

Stuart

 

Check fuel pump relay.
Joe

 

Fuel pump relay K40 is a known MB issue but is not usually temp sensitive. Just intermittent.

There are posts on the net that detail dry joints on the K40 circuit board which is the cause of this specific possibility.

Best way to check this one out is to wire up a bulb across the fuel pump terminals that you can observe whilst driving.
Does the bulb remain illuminated when you experience the problem? If so supply is OK. If not you have the answer.

Incidentally the fuel pump power supply is linked with engine oil pressure. Insufficient oil pressure (low oil, thin oil, hot oil, faulty pressure switch etc) COULD be the problem but not at the top of my list of likely causes.

Like with so many issues you need to eliminate some of the possibilities without spending a fortune unnecessarily.

Stuart.

 

Crank Sensor 99% of the time!

-mar-