The mechanic will examine the fuel pump to see if it is the cause of the poor performance and jerking sensation. Many modern cars have electric pumps located inside the gas tank. To check a bad fuel pump, a mechanic may have to remove the gas tank. If he or she finds the source of the leak, the mechanic will replace the failed components and start the engine to make sure the leak has been fixed. In order to check for a vacuum leak, the mechanic will examine the vehicle’s vacuum hoses and gasket. After removing the sensor, the mechanic should be able to discover the nature of the failure and replace the sensor. The mechanic will 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. The computer should be able to provide the mechanic with a better picture of what specific part or parts are failing. Your vehicle may also be sluggish and struggle while driving uphill or towing.Ī mechanic will first check your vehicle by plugging in a code reader/scanner into the vehicle’s computer. The fuel pump may dramatically increase pressure while failing, creating a jerking or surging sensation. When a fuel pump begins to fail, it may struggle to consistently deliver the correct amount of the fuel to the engine. A vehicle suffering from a vacuum leak may jerk while at high speed and may also struggle to idle.įuel Pump Malfunction: A vehicle’s fuel pump is responsible for moving gasoline from the fuel tank to the engine where it can be mixed with oxygen to run the engine. A vacuum leak may cause the engine to run inefficiently and the computer to generate an error code. This warning may be accompanied by an unexpected jerking or surging sensation while driving at high speed. A vehicle with a failing mass airflow sensor may also stall soon after starting.Įngine Vacuum Leak: Your engine uses vacuum lines to help the computer calculate the necessary position of the fuel injectors, ensuring an appropriate fuel/air mixture. When a mass airflow sensor begins to fail, it will typically generate an error code that triggers the Check Engine light. Service type Car jerks forward at high speeds Inspectionįailing 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 the right amount of fuel can be delivered from the fuel injectors.
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