Volvo AWD Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 11/2006

[<<]  [>>]


 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Working of knock sensor (octane related)

posted by  someone claiming to be Dutchman on  Wed Jul 10 04:54 CST 2002 [RELATED]

A request to the technical experts among you:

Who has experience with using RON 95 and RON 98 octane (EU figures) with regard to engine knock of the 5-cylinder engine generation?

My experience: Using 95 RON and accelerating in 2nd or 3rd gear (MT normal aspirated) from about 1000-1500 rpm, you can clearly hear the anharmonic knock sound. (Btw: you can only hear it when the window is open). Using 98 RON under same conditions there is no knock hearable.
I know that for the ECU to react, the knock sensor must first detect knock, before the ECU retards ignition. Is that what I actually heard?

How do you know the knock sensor is really working?
Is there one or two for the five cylinder engine?
Is the ECU able to recognize failure of a knock sensor?

Thanks in advance for your comments!







<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.