My 2010 f150 truck won't start in the mornings but
will start after the weathers warms up. I have
replaced the Battery to no success. I also took my
truck to Auto Zone they tested the alternator and
starter and it tested good.
Is the engine turning over when trying to start?
Cold weather tends to make things contract, even a little. Contraction, coupled with work contact points can cause voltage to the ECM contact problems. Try this. Place a small electric heater inside the vehicle on the floor, set to the lowest possible temperature, just enough to warm up the inside of the vehicle several degrees. If it starts, suspect the ignition switch, not the ignition cylinder. You can do the same with an electric hair dryer aimed at the bottom side of the column. It's probably a lot safer, especially if you forget you have the heater on inside the car.
"worn contact points"
Have the car checked for codes when running, even if no idiot lights are illuminated on the dash. "No start" or "hard starting" conditions can be caused by problems with the EVAP system. The EVAP system in 2010 Ford F-150 usually occur when individuals fill the tank with gas then keep clicking the fuel handled to squeeze the last possible drop of fuel into the tank. This causes raw gas to be forced into the canister, causing various problems within the system. When the filler nozzle clicks off the first time, it's full.
Check your fan clutch
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