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my renault megane s reg doesnt start whn warm?

hello does any one know why or have the same problem as me, my car starts fine from cold but when i have driven it for a while and turn the car off if i try and start it again it aint havin none of it ! whats it all about?
chris, October 2009
coolant temp sensor (not the one for the dash gauge) giving wrong output to ecu making it think the engine is cold so ecu sets a ritch mixture and timing for a cold start

n, October 2009
link Click here to see other fixes for Renault Megane.