What are the reasons why the Mazda CX5 cannot start after replacing the battery?
1 Answers
If the Mazda CX5 has difficulty starting after replacing the battery, the issue is not related to the battery. The main causes include the cold start injector not spraying fuel, a faulty coolant temperature sensor, a faulty intake sensor, poor fuel injector atomization, carbon buildup in the intake manifold, insufficient ignition energy, faulty spark plugs, or a faulty idle control valve. Below are the related explanations: 1. Poor fuel quality: Low-quality fuel often has poor volatility, especially in winter when temperatures are low. During cold starts, the engine block temperature is low, making fuel atomization difficult, which prevents the fuel sprayed into the cylinders from fully mixing with air, resulting in difficulty starting or even failure to start. 2. Excessive carbon buildup on the valves and intake manifold causing cold start difficulties: Carbon deposits can absorb a certain amount of fuel, leading to incorrect ECU judgments. For example, if the ECU controls the injection of 100 units of fuel-air mixture, but only 90 units actually enter the cylinders (with 10 units absorbed by carbon deposits), even if the remaining 90 units burn completely, the required power output will not be achieved. 3. The lower the temperature, the more fuel is needed for a cold start: The presence of carbon deposits will significantly affect the success of a cold start. Carbon buildup in any part of the engine can negatively impact its normal operation.
