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Why Won't My Car Start in Cold Weather?

1 Answers

Megan

07/30/25 10:44am

Reasons for difficulty starting a cold engine: 1. Insufficient fuel pressure: After the vehicle has been parked overnight, fuel in the fuel lines flows back into the tank, causing insufficient fuel pressure when starting. Inspection method: Connect a fuel pressure gauge to the fuel line and turn on the ignition; the pressure should be around 320 kPa. 2. Faulty coolant temperature sensor: Inspection method: Use a multimeter to measure the resistance and voltage of the coolant temperature sensor. 3. Insufficient or uneven cylinder compression: Inspection method: Use a compression tester to check the compression of each cylinder. 4. Faulty charcoal canister purge valve: Since the charcoal canister purge valve operates in a closed-loop control system, it also activates when starting the vehicle in the morning, enriching the air-fuel mixture and preventing proper combustion. Inspection method: Use a diagnostic tool (e.g., 431 scanner) to read fault codes.

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