my car does not start anymore

[shamtah]

i have a w126 300 se
firstly if i drive it every day there is no wrong but if i leave it 2 or 3 days without starting it starts normally but after 10 or 20 minutes it stalls and restart normally after it cools down , the last time this happened the car did not return as it was, once i start it the rpm goes up and down then it stalls
it does not go to work anymore
recently i changed the fuel pump
i wish u kindly to tell me what do think is the problem
thank u very much

 

[vmcml320]

This happened on my ml320 found to be engine temp sensor and needed changing.

 

[shamtah]

i changed it a few days ago but nothing changed
thank u for your assistance

 

[Xtractorfan]

Does yours have a crankshaft position sensor ,, worth checking and changing

 

[television]

Very often it is the high voltage electric and condensation in the dizy cap and rotor arm

 

[shamtah]

thank u all for help
i doubt it may be the ignition module , anyway ill first check the parts u told me about

 

[Arv]

I had similar problems long time ago. The stalling/engine cutoff problem was the speed sensor and the restarting problem was because of malfunctioning OVP (Overload Voltage Protection) relay. Before you change OVP relay, check the fuse on it. It is located where the diagnostic device connector is at least on my C280. OVP looks like a square plastic tube.

Good luck,
Arv.

 

[shamtah]

i dont know what to do?
i tried checking the followingvp relay,ignition coil ,fuel pump relay,distributer cap and they r all ok
i want to ask does it possible that the ignition coil gives good electricity but still the ignition coil is not working properly ?

 

[meanie]

Did you hear the engine pop back when the symptons changed, because it sounds as if you may have an air leak.
Check the breathers under the inlet manifold & the fuel metering head for correct fitment & condition.