Pfc Knocking

[R31Nismoid]

With aftermarket management that uses the factory knock sensor.

If you have a stock ECU - dont worry about it.

[Guilt-Toy]

My knock sensors go off their head for no reason as well. this is normal.

just put it on the dyno and make sure its not pinging.... the tuner will have ways of checking this

[Macross]

If you don't have a hand controller it's also possible to setup the PFC so that it flashes the warning lights if knock exceeds a certain threshold.

[R33silverS2]

If you don't have a hand controller it's also possible to setup the PFC so that it flashes the warning lights if knock exceeds a certain threshold.

I think it does anyways when it goes over 60. (default i think) I know my engine light flashes if it goes over 60.

[evil_weevil]

Mines set at 80 I think?

[r33_racer]

our dog box used to set off the knock sensors something fierce before we changed to sm4. Like said earlier on, its not always the engine sometimes outside noises can set them off even when there is no detonation.

[MBS206]

a power fc reading of 125 is false, if it was correct you would definately hear it even if you didnt know what knock is. The knock sensor has picked something else up and like explained above there are many things that create the "frequency" that the knock sensor is tuned to detect, even rocks/pebbles being flung up into the engine bay can set this off.

If you are driving around with the normal max knock sensor of 40 thats ok. Anything around a true knock reading of 80 or so and knocking or pinging whatever you like to call is audible. You'll know when it pings, its a very distint noise.

To make yourself sleep a bit easier, stick it on the dyno and get a pull done just to double check afr's and knock levels

cheers

So then, a reading of > 120 should be ignored...

A question, if it is something else causing it, why when I add more fuel in, drop the ignition timing, the knock value lowers it self to a respectable level?

[paulr33]

knock sensors, readings, what they mean etc have been done to death

check out the powerfc faq in my signature for some extensive work on knocking and debugging it

dont ignore it - you may as well just buy new forged pistons now if you just keep ignoring it

[R34GTFOUR]

So then, a reading of > 120 should be ignored...

A question, if it is something else causing it, why when I add more fuel in, drop the ignition timing, the knock value lowers it self to a respectable level?

i wouldnt believe a reading of 120 if i couldnt hear it, like i said knocking becomes quite clear around the 80 reading on the handcontroller. At 120 its pinging its nuts off and people in a car next you would also clearly hear it, thats how severe it is.

This isnt to say the car isnt suffering from detention even if the reading is incorrect, but to be safe take it to a dyno and then you can rest assure everything is ok

[oweban]

So then, a reading of > 120 should be ignored...

A question, if it is something else causing it, why when I add more fuel in, drop the ignition timing, the knock value lowers it self to a respectable level?

Haha, new Tetris High Score today, got 154. Fark. I really gotta get this shit sorted out. I hate having no money.