sorry but no NA 86-91 rx-7 come stock with a knock sensors , maybe your confusing the sensor with something else??

or do you have a turbo engine swaped in or somethin???



if your car is a turbo engine, it would have a knock sensor located on ...s4: on the center iron near the oil filler neck area, then if it was an s5 t2 it would have a knock sensor mounted on one of the rotor housings above the spark plug area.

 

I may be mistaken but my safc instructions had a connection for the knock sensor in a S4 and it does read, my old wore out engine usually stayed about 50 or 60 counts, and the new stays about 10 to 20.

 

a s4 turbo II DOES have a knock sensor,



however a s4 NA, doesnt!



if you check the wiring diagram for a NA and hte pin out on the ECU, the same wire for the turbo knock sensor, is used on a NA for something else, like an emission solinoide or something.

 

S4 NA does NOT have a knock sensor.

 

Hmm, I was mistaken then, maybe I should disconnect that wire to the afc before it screws something up.

 

yea me and my friends desided to un hook the battery the other night and tape up the wires that were kinked and we have no probs thanks for your time

 

u still might wana check ur grounds