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Created: 1 Jan 2003
Updated: 1 Jan 2003
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What is a 'Knock Sensor''?
The knock sensor (KS) are commonly found on modern injection engines (carburetor engines do not have them installed), but NOT all injection engines use a KS. It is a sensor that outputs a small electrical signal on detecting 'engine knock'. Its related to ignition timing and fuel detonation within the cylinder head. On receiving a knock signal, the ECU (Engine Control Unit) will temporarily adjust (retard) the ignition timing to prevent the condition.
Some engine systems with a KS can detect engine knock in an individual cylinder. Timing for that cylinder alone will be retarded by the ECU until knock ceases.
So basically, the KS is used to stop the engine detonating (destroying) itself when the engine is running.
For more information on how the KS works and its location, see the technical guide on the KS by clicking here.
How do I test the KS?
For this test you need a strobe gun, so you can physically see the timing change via the cam belt or the timing mark on the crank pully wheel.
No other testing is possible. On most Vauxhall modesl, make sure that the connector which plugs onto the KS is red in colour.
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