Knock sensor being difficult - cause found![200/83]

BrickBoard Archives

The files contained in this listing have been automatically archived from the active forums. Because the vast majority of posts are now in one place, this archive is considered legacy. You should use the SEARCH feature OR choose your topic and select date tabs within the forum you choose.

Knock sensor being difficult - cause found![200/83] posted by Jason Kneier on
Wednesday, 12 January 2000, at 10:27 a.m.

Thanks Abe! Original problem was - random timing retardation causing uneven power delivery. Suspected knock sensor/wiring problem. Knock sensor did not have correct voltage and did not seem to respond to whacking the engine.

Per Abe's advice, I re-split wire from knock sensor to control unit and drove 'sensorless' - no change in behavior. Confident that there was no danger of damaging my spare ECU, I swapped it in and put key to position II (car not running) - I got 2.5V on the knock sensor wire! Then took a test spin - problem is cured! I suspect when I open the original control unit I will find a bad solder joint at or near the knock sensor pin. Thanks to all who responded! --
Speed Racer '83 240 DL, '74 164 E, '93 940 OL1 (Smithfield, NC)

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.