1997 BMW M3 3.2 EVO

If it got too hot the engine may have been damaged. You will need to have a cylinder compression test to make sure the engine is ok. Did the coolant get all over the engine? Some electrical connections may have gotten wet. Make sure it is getting fuel. Spray a little starter fluid into the throttle body.

It always helps to tell us what you are working on. Could be bad coolant temp sensor; bad coil or module (these heat up after you turn hot engine off); improper fuel pressure (test with gauge); leaky injector(s).

Its a hot start issue.

Can be related to low fuel pressure or problem with crank sensor.

Also it can be weak battery or starter.

But possibilities are to be inspected to confirm what exactly it is.------

To troubleshoot and confirm the issue,i suggest you refer few solved help links with similar types of problem like yours:------

Click the link below:------

1991 Toyota Trecel: Engine Starts fine but dies when gets Warm?

http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html

-------------

1994 Toyota Pickup: Starts fine but dies in few seconds?

http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html

------------

1995 Lexus LS400: Running Hot?

http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html

------------

2002 Toyota Camry: Puff of Blue or White Smoke while Starting?

http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html

------------

Multiple problems on car: Car runs hot, A/C blows hot and car starts surging?

http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html

--------------

Delay starting on Toyota Prius?

http://schematicsdiagram.blogspot.in/2012/02/delay-starting-on-toyota-prius.html

-----------

Honda car will not start intermittently?

http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html

--------------

Vehicle Starts, Runs and Loses Power

http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html

--------------

Intermittent starting issues on Volvo 760?

http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html

-----------

Car starts and cuts off immediately?

http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html

-----------

Car won't start when cold?

http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html

===========

These details will help.

Thanks.

We do not have BMW diesels (thank goodness) in the USA. That said has the engine control moule been scanned for fault codes? You must do this 1st.

Do you own a scan tool ? One that shows engine sensor data parameters ? Checking sensor data would be the thing to do .
047 Engine Hard to Start or No Start Scan Data for Ignition
Check spec. to factory spec.
048 Engine Hard to Start or No Start Scan Data for Starting Problems .

If the engine cranks but fails to fire, the car may be flooding due to a failed temperature sensor. There are several, but the most likely problem would be the water temperature sensor.
If the engine fails to crank when hot, the starter motor is failing and will need to be replaced.

not enuf fluid.

you are having a fuel delivery problem...and it could be caused by numerous things...such as a bad fuel pump, a bad cold sensor or warm up injector.  You haven't attempted to  solve any of these suspected faults...so take it to a mechanic for repair

I would have the battery tested. When they get cold they get weak. Next I would look at the wires on the starter to see if their loose.

The vanos system advances vavle timing during engine accelleration by changing camshaft angle. See the M3 Wiki.