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Q: One morning it was cold and my car didn't start up. So when I got home from work at 4:00. I tried to start it IP it did. The next

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Yesterday morning it was cold and my car wouldn't start. So when I got home about 4:00 I started it up and it cranked up. Now this morning it did the same thing. What is that

My car has 140000 miles.
My car has an automatic transmission.

In cold weather, engines need more fuel - a "richer" fuel mixture - to start. If the fuel mixture is too lean - not enough fuel - the vehicle may not start. Then later in the day when it may be a little warmer, the fuel mixture may be just enough to get the vehicle started. A number of components can cause this, even without setting a fault code and turning the check engine light on. If the coolant temperature sensor is shorted, or "lazy" - not responding or signaling quickly enough, the engine control unit may not signal that it is a "cold start" so the engine needs more fuel. The same can happen if the ambient temperature and/or barometric pressure sensors are faulty.

A certified technician can connect a diagnostic scan tool to the vehicle to correctly diagnose why it is hard to start.

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