Know the Symptoms of a Bad Knock Sensor (1)

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Know the Symptoms of a Bad Knock Sensor
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Engine detonation happens during the internal
combustion process when the fuel mixture in the
cylinder explodes and results in a change in the
ignition timing.
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This detonation is known as engine knocking and
there are knock sensors that detect such
vibrations and send a voltage signal to the
powertrain control module.
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The PCM works to alter the ignition's timing and
thus helps to prevent the engine detonation and
avoids serious damage to the engine.
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But, as the knock sensor is an electronic device,
it can malfunction at times and cause
disturbances in the functioning of the engine and
the car.
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Here, are some of the commonly observed symptoms
in a car when the knock sensor turns bad.

• Engine warning light
• Loud sounds
• Bad fuel mileage
• Poor acceleration
• Poor engine performance

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Engine warning light
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The engine warning light glows up on your
dashboard when there is any problem with the
engine.
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So, even when the knock sensor fails to operate
then also the warning light illuminates and
alerts the driver of a possible issue in the
engine.
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Get the engine checked by a professional as it
might be some issue with the warning light.
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Loud sounds
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When the knock sensor starts to malfunction,
there are instances of loud noises coming from
the engine.
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The issue of sounds should be resolved quickly,
otherwise, the intensity of the sounds will just
go on rising with every passing day.
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The main reason for the loud noises is due to
the ignition of the air-fuel mixture inside the
cylinder when the knock sensor is not actively
operating.
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Bad fuel mileage
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A bad knock sensor could also result in
decreasing the fuel mileage of the car.
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There is more use of the fuel than the needed
proportion in the air-fuel mixture for the
process of combustion.
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Also, at time unused fuel drains out of the car
through the exhaust outlet pipe.
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Poor acceleration
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While accelerating the car, if you experience
slow acceleration as compared to normal
conditions, then the bad knock sensor could be
contributing to that.
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A faulty knock sensor prevents the acceleration
from being effective as it obstructs the
sufficient combustion of the fuel mixture in the
engine.
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If along with the other symptoms, there is poor
acceleration, then get the knock sensors checked
by a technician.
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Poor engine performance
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The worst symptoms due to a bad knock sensor will
occur when the engine starts to get damaged and
delivers very poor performance.
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Also, there can be a burning smell coming from
the engine into the cabin due to serious issues
in the engine.
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In such case, the knock sensor must be
immediately replaced or else the car will begin
to continuously drag and jerk around.
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