Modern cars have warning systems such as the check engine light that prompts you when something is out of the ordinary. However, vehicles can develop unexpected problems without warning, causing drivability problems. Does your car shut off when you slow down or stop? Here’s why.
1. Faulty Fuel Pump, Dirty Or Defective Fuel Injectors, Or Low Fuel Pressure
A malfunctioning fuel pump, dirty or defective fuel injectors, and low fuel pressure create inconsistent fuel flow, causing the engine to struggle as the vehicle runs. The resulting problem is the engine stalling when idling or driving at low speeds and, in extreme cases, a complete engine shutdown.
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2. Clogged Or Restricted EGR Valve
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The Exhaust Gas Recirculation (EGR) valve helps to reduce emissions by returning some of the exhaust gas into the combustion chamber. A clogged EGR valve or one stuck open or closed leads to reduced power, causing the engine to shut off.
3. Faulty Oxygen Sensor
The engine requires the right amount of fuel-air mixture to operate smoothly. The oxygen sensor helps adjust the air-to-fuel ratio by measuring the amount of oxygen in the exhaust gases. A faulty sensor allows either too much or too little oxygen. Too much oxygen creates a lean fuel-air mixture, which renders the engine incapable of propelling the vehicle at low speeds.
4. Bad Idle Air Control Valve
The Idle air control valve acts as a bypass for the throttle body plate. It opens or closes to allow air into the engine and maintains the correct air for a steady idling speed. A faulty idle air control valve fails to do its job correctly, causing rough idling and the engine to shut down. It can also cause the engine to die right after starting it.
5. Worn-Out Wiring Harness Or Spark Plugs
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The wiring harness transfers the voltage required for igniting the fuel-air mixture inside the engine. Loose, corroded, or poorly connected wires and worn-out spark plugs lead to inconsistent power supply, depriving the vehicle of optimum power as it slows down.
6. Malfunctioning Transmission
In automatic transmission cars, the torque converter replaces the manual clutch and transmits power. A broken or faulty torque converter or solenoid results in a malfunctioning transmission. Hence the vehicle is unable to maintain power at low speeds.
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Source: https://t-tees.com
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