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What Causes the Need to Start the Engine Multiple Times When Cold?

1 Answers

VanCarter

07/30/25 10:46am

Reasons why a cold engine requires multiple attempts to start: 1. After the vehicle has been parked overnight, fuel in the fuel lines flows back into the fuel tank, resulting in insufficient fuel pressure during startup. Inspection method: Connect a fuel pressure gauge to the fuel line, turn on the ignition, and the gauge should read around 320kpa. 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 across cylinders. Inspection method: Use a compression tester to measure the compression of each cylinder. 4. Faulty carbon canister purge solenoid valve. Since the carbon canister purge solenoid valve operates in a closed-loop control system, it also activates when starting the vehicle in the morning, enriching the air-fuel mixture and causing improper combustion. Inspection method: Use a 431 scanner to read fault codes.

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Why does the all-new Tucson experience sudden jerks during acceleration?

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What to Do When the Car Battery Dies Due to Leaving Lights On?

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What is the reason for the red light on the electric vehicle charger but no sound?

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