pcb

The factory engine knock sensor is connected solely to the knock link. With the sensitivity setting on the knock link turned to fully clockwise positiion which is the most sensitive setting. However only the first led on the knock link light up with engine rpm rev up to 7000 under heavy load. This insignificant in knock sensitivity is causing problem to detect engine knock effectively. I am running short of ideas on the possible cause of this fault. I tried to reconnect the whole knock link wirings to an additional knock sensor mounted on the cylinder head. The result improved slightly to two led light up under the above testing condition. My question is, are there any possible method to boost up the knock sensor signal to knock link ? The possibility of faulty knock sensor or faulty knock link seems low. It feels to me that unexpected signal reduction has occured within the wirings. Since the current wiring method untilize the factory knock sensor wire, running from the knock sensor to a connector on top of the intake manifold. The knock link wiring are joined from this conector and run through the engine fire wall. As i have mentioned above, to verify this problem i tried to mount an additional knock sensor and secured on the cylinder head and reconnect all the wirings using new wires but the results wasn't significant enough to identify the problem. This vehicle is running a G4 plugin, without the correct engine knock information, other required work connot be continue at this point. If anybody can provide some suggestion on this problem would be very appreciated. Thanks.

i have a g4 plug in for silvia s14, wondering how to wire a wide band controller to the g4 for running auto tune. thanks

thanks for the reply, i think i have the short header s14, i understand i have to wire the air temp sensor to the ecu pin 15, but where did pin 15 goes to on the factory ecu or is it just a blank plug ? what about earth, where should i earth the air temp sensor ? thanks again

its plug in ecu, do you wire from the air flow sensor plug or wire direct to the engine ecu. which wire becomes the input temp 2 on a plug in system ? thanks