i have a 2000 gsr with a chiped p72 ecu in a 93 hatch i have 2 check engine lights 41 and 23 what is a knock sensor and how do you fix it? my v-tec pops @ 4400rmp revlimit 9000 it worked fine till two days ago the vtec has been acting up like it would come on then go off then come on then go off ??? today it did not pop at all then on my way home it did!! also i opend the ecu and there is a black thing with three metal prongs that come out of it like a resister or something but its burnt would that make a difference?? please im going nuts trying to figuer it out and i need someone elses perspective on the situation
thanks

 

Well the knock sensor part you are going to have to use a GSR harness in order to fix the problem. If that does not work then you are stock with a knock sensor code like everyone else. This could either be that your car needs a knock sensor plug to be used (not sure) or a need for a GSR harness. Good luck !!

 

replace your O2 sensor..

 

thanks i'll try

 

oh one more thing do u need a knock sensor?? dose it matter??

 

You do not need a GS-R harness, you simply need to wire in the knock sensor, its 1 wire back to the ECU. Or you can chip the P72 and disable the knock sensor. You will also need to replace the oxygen sensor to get rid of the code 41.

 

so the burnt thing has nothing to do with the v-tec problem? also the ecu is chiped i pluged back in a wire that was out of the ecu and the knock sensor went away for a bit but when i dorve my car it came back and the wire was till in ??? dose it make a difference of why my v-tec is acting up? or is it the o2 because when i got the car the wire was out of the ecu but the car still ran fine im thinking its eather the o2 or the burnt thing on the ecu!
Any comments on that?

 

I completely missed the burnt part in the OP. pics of the ECU showing the burnt part might help a bit, I maybe able to figure out exactly what it is that burnt, zoom out for enough so you can see the entire ECU board. If you are throwing a CEL for a knock sensor vtec will not engage.

 

good point ''94EG8'' you don't really need a GSR harness, you just need to wire up the harness with a knock sensor. My B16a does not have a knock sensor because it's JDM from what i been told. If i would want to do this i would have to drill in back of the head and mount a Knock Senor. other than that It works like a charm!! sure not the grates motor, but never had any problems=0

 

My VTEC work perfectley with a Knock Sensor CEL code...wierd !!!ill look up in to that too!

 

There is a way to bypass the knock sensor. A guy either here or another site used some sort of peizo device to send a small, varying signal to the ECU to mimic what the sensor would put out.

That, or you could go OBD1, or modify it like someone else did.

 

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hey i just wanted to say to everyone that helped me out with info thanks for everything the info relly helped out. i found out the problem i had no oil f **ked up yea this whole time i thought it was my ecu or v-tec solonoid but it was bone dry thank god i never blew my head but yea i put oil and now it works!! THANKS AGAIN FOR EVERY THING

 

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