The most common symptoms of a faulty knock sensor are engine noises, flashing dashboard or “Check engine” lights and diminished fuel economy. These symptoms are most common when the vehicle is travelling at highway speeds or carrying a heavy load. To properly assess the condition of the knock sensor, compare engine performance to its factory specifications found in the vehicle’s manual.Know More
Flashing or activated warning lights are the most common indication of a bad knock sensor. A faulty knock sensor pairs activated or flashing warning lights with strange engine noises, which are the most common symptoms associated with faulty knock sensors.
Common engine noises associated with faulty knock sensors include sputtering, knocking and pounding sounds. These noises stem from pre-ignition, which results from fuel and air igniting inside the cylinders instead of burning evenly throughout the engine.
Faulty knock sensors also decrease fuel economy. Fuel efficiency decreases with faulty knock sensors because of an improper mixture of fuel and air. The engine cannot combust properly, which leads to higher emissions and reduced fuel economy.
A faulty knock sensor miscalculates the fuel to air ratio. When this ratio is not properly determined, the vehicle cannot accelerate nor use fuel efficiently. Faulty knock sensors disrupt communication between the engine and the vehicle’s computer. This disruption diminishes vehicle performance through a misallocation of fuel delivered to the engine.Learn more about Car Parts & Maintenance
An engine coolant temperature sensor needs replacing if the vehicle has trouble starting, black smoke comes out of the exhaust pipe or the vehicle consumes more gas than normal, according to CarsDirect. Leaking coolant and an overheating engine can also be signs of a defective coolant sensor.Full Answer >
Some of the more common symptoms of a worn-out or broken engine exhaust valve are rough idling, backfiring, reduced power and decreased gas mileage. In certain cases, this problem can even lead to total engine failure, so it is important to have it looked at by a mechanic immediately.Full Answer >
One of the most common symptoms of the need to replace the heater core in a Dodge Ram 1500 is a sweet smell inside the truck, according to RepairPal. The smell is characteristic of a coolant leak; it means that vaporized ethylene glycol from the vehicle's cooling system is leaking in the vehicle.Full Answer >
The most common symptoms of a bad exhaust gas recirculation valve are rough or misfiring idle, detonation, stalling and hard starting. The EGR valve is a component of an automobile’s exhaust circulation system that reduces pollution-causing emissions.Full Answer >