If the vehicle’s computer is having difficulty providing consistent power to the fuel pump relay, the computer may need to be reprogrammed or replaced. If the mechanic suspects an issue with the fuel pump relay, he or she should check the vehicle’s computer for a problem. After removing the sensor, the mechanic should be able to discover the nature of the failure and replace the sensor. The mechanic should check the wire harness connected to the sensor to ensure that all of wires are properly connected. If your vehicle has a bad or failing mass airflow sensor, the mechanic will begin by finding the sensor in the engine bay and checking for any signs of failure. Using this information, the mechanic can begin necessary repairs. The mechanic should be able to get more information from your vehicle’s computer on what component has failed. When an ignition coil begins to fail, it may struggle to provide consistent spark to the plugs, causing the engine to stall after starting.Ī mechanic will begin diagnosing your vehicle’s issue by plugging a code reader/scanner into the vehicle’s computer. Ignition Coil: Your vehicle’s ignition coil takes the low voltage of the battery and provides the thousands of volts needed to create a spark in the spark plugs. If the vehicle’s computer is unable to keep the fuel pump relay running throughout the starting process, the vehicle may start and quit immediately after starting. While the vehicle is running, the fuel pump relay turns off and the fuel pump is powered by the oil pressure sending unit. The fuel pump relay engages as the vehicle is started and starts the fuel pump. An issue with the mass airflow sensor may manifest itself when a car starts and then stalls soon after starting.įuel Pump Relay: The fuel pump relay functions much like a fuse for an electric fuel pump. When a sensor begins to fail, the vehicle’s computer may generate an error code to indicate that something has gone wrong. Mass Airflow Sensor: The mass airflow sensor measures how much air is entering the engine and relays this information to the vehicle’s computer so that the right amount of fuel can be delivered from the fuel injectors. Service type Car starts and then dies Inspection
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