Knock sensor wiring
 

My FD needs the knock senor rewired. The factory connector isnt there anymore and I have a powerFC. The other day I was changing plugs and noticed the knock sensor wiring basically fell apart when I touched it. Can anyone post a link on instructions on how to do this or give me some guidance. I found it strange that the wire going to the ECU was connected but then there was also some kind of weird ground wire coming off of it too

I don't have an FD, but I do think that weird ground wire coming off the knock sensor wiring is what is called a shielded ground. A shielded ground is simply a length of wire mesh that surrounds a wire which could receive unwanted electrical signals from other interfering components, such as ignition systems (spark plugs firing). The pulsing of a plug wire transmitting high voltage electricity can, in some situations, send a magnetic pulse or signal into the surrounding wiring which could accidentally trip the knock sensor, which would result in unwanted engine management and over/under correcting certain systems.


If this is the case, simply twist up the end of the mesh and ground it to the block somewhere, with a ring electrical end or something of the like. As for the connector, only the main wire should attach directly to the connector. Leave the shielded ground around the wire and make sure it isn't touching the connector lead. Also, if you cant get the shielded ground wire out enough to ground out, don't worry, because it more than likely grounds out somewhere else in the harness.


pictures of your issue would help too if you have them.

I'm not sure if you can reattach the wire to the sensor, I had to buy a used one off ebay, and that fixed my problem.

Don't believe the PFC uses the knock sensor to control the engine (stock ECU will use it to retard timing)

If you are running a stock ECU won't you go into LIMP mode?

Not sure about limp mode, but it does retard timing. It will also throw a CEL