OK, newbie question, what and where is it?
Steve
Knock Sensor
Moderator: RichardW
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Hell Razor5543
- Donor 2023
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- My Cars: C5 Mk2 VTX+ estate.
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Re: Knock Sensor
Hello Steve,
I personally cannot help you, but a question that does need to be asked is what is the vehicle?
I personally cannot help you, but a question that does need to be asked is what is the vehicle?
James
ex BX 1.9
ex Xantia 2.0HDi SX
ex Xantia 2.0HDi LX
Ex C5 2.0HDi VTR
Ex C5 2.0HDi VTR
C5 2.2HDi VTX+
Yes, I am paranoid, but am I paranoid ENOUGH?
Out amongst the stars, looking for a world of my own!
ex BX 1.9
ex Xantia 2.0HDi SX
ex Xantia 2.0HDi LX
Ex C5 2.0HDi VTR
Ex C5 2.0HDi VTR
C5 2.2HDi VTX+
Yes, I am paranoid, but am I paranoid ENOUGH?
Out amongst the stars, looking for a world of my own!
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addo
- Sara Watson's Stalker
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Citroën Berlingo
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It's a device bolted firmly to the side of your engine block; it contains a piezoelectric crystal plate under slight compression.
The characteristics of this piezoelectric disc (or "crystal") make it very sensitive only to frequencies within a small range, correlating to frequencies emitted by the motor when it preignites. When triggered by suitable frequencies, it resonates in sympathy and generates a small signal voltage which is read by the ECU - indicating that preignition is occurring. In sequence, the ECU then retards ignition timing or increases fuelling - depending on other sensor inputs that describe the prevailing conditions.
The characteristics of this piezoelectric disc (or "crystal") make it very sensitive only to frequencies within a small range, correlating to frequencies emitted by the motor when it preignites. When triggered by suitable frequencies, it resonates in sympathy and generates a small signal voltage which is read by the ECU - indicating that preignition is occurring. In sequence, the ECU then retards ignition timing or increases fuelling - depending on other sensor inputs that describe the prevailing conditions.
Re: Knock Sensor
The vehicle is a C5 1.8 petrol, not that it matters now as the question has been answered quite succinctly by addo: thanks guys.
SteveT
SteveT