Knock sensor help

[James]

For starters the problem is that my car rewads 40+ counts of knock at ANY AMOUNT OF THROTTLE. Sitting in my drive way if its in Neutral and i give it a couple of revs i get 40 counts of knock.,

I replaced my knock sensor with a known working one, though mine looked good when i took it out. whats next?

note- previous owner had to have wired the sensor in since its a non turbo harness. (correct?).

 

[EHmotorsports]

Never trust another persons wiring. Unless if it's working properly. I would start by checking the wires from the knock sensor to the ecu. Also take a paper clip and do a drag test on the pins.(battery disconnected) and make sure they have proper drag to make a good connection.

 

[James]

I would think if the wiring was bad I would either get a cel for the sensor, or the readings would be more random.

I visually checked the wiring and it looks good. I'll physically check it tomorrow.

My gut wants to say its not real knock but it's screwing with everything else. When I hold the throttle at 1k to try and level out the fuel trim i get 35 degrees of timing advance.

 

[Jason G.]

Have you checked that all your cam timing marks are lining up with the crank at tdc?

 

[James]

I have not.

Note- my Wideband came in the mail today! Might try to get it in tomorrow

 

[ktmrider]

Sensor is super sensitive to torque, ie over-tightening. Barely over hand-tight IIRC, 7ft/lb. Will cause crazy knock like described if too tight.


Also heard of people shimming the KS with copper washers, helps drop some phantom frequencies.

 

[James]

I got it hard tight then gave it a tug with a wrench. I'll loosen it a hair and check! Thanks

 

[Xcelerate]

Eighther bad sensor or too advance timing. Check the wire to terminal also make sure it's on the right pin. And make sure he use a sheilded wire coz regular wire will bleed out and pick up noise from the chassis.