How does the knock sensor work on a late model engine?

How does the knock sensor work on a late model engine?

Check for a defective knock sensor. Many late model engines have a “knock sensor” on the engine that responds to the frequency vibrations characteristically produced by detonation (typically 6-8kHz). The knock sensor produces a voltage signal that signals the computer to momentarily retard ignition timing until the detonation stops.

What causes an engine to knock under acceleration?

The static compression ratio of engine will increased when cylinders has been bored to oversize and an engine have been rebuilt. Or to restore flatness the resurfaced have been done in the cylinder head, this way will also increase the static compression ratio of engine and reducing the combustion chamber volume.

What does the knock on the engine mean?

Spark Knock (Detonation): Engine Knock Under Acceleration. Spark Knock is a pinging noise, rattling or knocking which might be heard while the engine is working hard under load (passing on the highway, towing a trailer, driving up a mountain, etc.) or is accelerating.

Why is detonation not good for the engine?

Detonation is not good for the engine, it may could break piston lands and the rings, can damage the rod bearing, also can causing the head gasket to fail if it happen over long period of time. This common reason why spark knock (detonation) occurs:

The static compression ratio of engine will increased when cylinders has been bored to oversize and an engine have been rebuilt. Or to restore flatness the resurfaced have been done in the cylinder head, this way will also increase the static compression ratio of engine and reducing the combustion chamber volume.

Spark Knock (Detonation): Engine Knock Under Acceleration. Spark Knock is a pinging noise, rattling or knocking which might be heard while the engine is working hard under load (passing on the highway, towing a trailer, driving up a mountain, etc.) or is accelerating.

What does detonation do to a car engine?

Spark Knock (Detonation): Engine Knock Under Acceleration. Spark Knock is a pinging noise, rattling or knocking which might be heard while the engine is working hard under load (passing on the highway, towing a trailer, driving up a mountain, etc.) or is accelerating. When the fuel is detonating it called spark knock.

What does the knock sensor on a car do?

Knock sensor is part of the engine and will tell the computer systems to retard the ignition timing when it detect the detonation.