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Clicking sound from engine S80 2004

posted by  someone claiming to be Dutchman on  Sat Jan 10 05:23 CST 2004 [RELATED]

Michael,

To find out wheter it is pre-ignition or not:

Knocking or pre-ignition generally will be more present during (hard) acceleration and/or under load. If the sound is also present during cruising, then it is most likely NOT pre-ignition.

Pre-ignition can be audible for a short time when using low/mid grade gas: It takes time before the motor management recognizes the sound from the knock sensors and retards ignition and/or decreases turbo boost as reaction. If you press the accelerator real hard (using low/mid grade), then this could even be out of the range of retardation and you will hear some "knocks".

So, if you hear the sound ONLY during acceleration or load, then it might be pre-ignition.

Let me hear your experience.

Kind regards,

Dutch






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New Clicking sound from engine [S80][2004]
posted by  mhobbs  on Sat Jan 10 03:23 CST 2004 >


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