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I have this situation with my C6 LS2 engine. In cold start it does very fast, I drive for 5 minutes or less, shut down the engine and let it cool down for 1 hour. Then I start it up and crank so long before starts and just to check I inmediately shut down the engine and start it up again, this time starts very fast just like a cold start.
I changed spark plugs, spark plugs wires, Crank/Cam position sensors, cleaned inyectors, MAP and MAF
Does anybody know what could be? Is like engine only likes to start cold or hot but warmed takes a Little more cranks before good start