What is torque rating on knock sensor? Would changing this affect CF?

[A4TL]

We must realize as knock sensors get old they go deaf, etc yadda.

What is the proper torque rating on the knock sensor?

Would increasing the torque (better, replacing the sensor) a little have much effect on the ecu? consider age of sensor.

One would think we'd replace the knock sensor on a 2002 by now.

any thoughts?

[bananas]

20Nm (about 15 ft-lb)
Yes, the torque on the knock sensors will change the voltages. Don't do it though. Torque them exactly to spec. If you suspect they're bad, just get new ones.

[A4TL]

so you think after 4-5 years (90K) miles it may be wise to replace them?

Anyone notice that #4 cylinder (end of fuel rail) tends to get more CF than the rest? (swapped plugs,new cp's, moved injectors).

I wonder if all cylinders are pulling but the knock sensor is more/less sensitive.

Bad is like the o2 sensor. It will become less responsive and read leaner. My mpg will decrease (maybe .05mpg at a month) but that means i ordered a new one.

What say ye on knock sensor replacement. The quicker timing is pulled, the less likely the engine will crater in the aging years.

It's the subsonic detonation i worry about. I can hear ping like no tomorrow (i tune cars, lol). SBD kills.

[bananas]

if you suspect they are bad, I see no reason not to replace them as they're relatively cheap (maybe 70 bucks for the pair?)

[emanar]

Yes if you over torque the knock sensor will make a huge difference in the reading they will send to the ECU.

Referring to the why the the Num 4 cylinder have more CF that the other is because is the farther cylinder from the throttle body. That makes the 4 cylinder a little lean so the ECU most compensate for this variation. Those German think in everything
I recommend torquing them at 15 lb/ft not more or less.