Knock Plug Help? Rb25Neo Turbo Motor

[nismokiller]

Hey ive got a rb25neodet from a 34 in my skyline, basicly pulling it down wire tucking to remove headlight loom and other wires.. While doing so, I had spotted that my motor was running without knock plugs? are they neccessary? its got a impul chip computer i believe , And i think It ran without knock plugs over the span of matsuri 24hr drift? nothing seemed wrong and the motor ran awsome!

Can i delete them from my loom? or should they be there.?

[GTSBoy]

The ECU should chuck a fault code if they are disconnected. If the knock sensors are not reading any knock (ie, connected to loom but not attached to block) then the ECU will continue to run the ignition advance at whatever the maps say to, without swapping to the knock map. As long as the map values are not causing knock, then all is good. If there is some knock though, the ECU can't know about it and can't do anything about it.

If your car has the knock sensors screwed into the block, but the plugs unplugged......you might want to plug a Consult unit in and see if it is throwing codes or not.

[nismokiller]

Ive just looked are the plugs , knock plugs go to 1 plug that have wires which also return to the fuse box (very small wires) 2 of which are cut, but. the wires from the knock sensors are still attached, ive plugged in back to the engine loom? will this still sense knock etc or were the 2 smaller wires acting as a current feed?

[GTSBoy]

Someone might have replaced the sensors with the appropriate value resistor to prevent codes. Check the wiring that was there to see if there's a resistor or two hiding somewhere.

[nismokiller]

nothing seems to run fine without them tho so should i be really concerned?

[GTSBoy]

It will be OK, right up until you get a bad batch of fuel or lose boost control or something similar. Then it might ping itself to death before you notice. You're just missing one extra layer of protection against that sort of thing, is all.