hey guys i have been trying for a month to try and clear some codes from my car and i still havent been able to do so. i have 4 codes:
0104-which is the speed sensor from ben's ecu mod
0304 which is the knock sensor
0402-which is the fuel tank sensor temp
0903-which is the evap code


the 0104 and the 0402 codes i caused by myself cutting wires for the bens ecu mod. its the 0304 and the 0903 codes that are bugging me. i just changed my knock sensor out for a new on during july 4th weekend and cleared the codes and the evap and knock sensor codes were gone. but after a couple of days they both would come back and my car would run like crap. i so far have gone through 3 knock sensors since i got the car in 03. so i know something is wrong but im not sure if my car is throwing a ks code due to the evap code being there or if there really is something wrong with my car. im close to the point to just moounting the ks some place else and seeing if that would make the code go away. so i just need some imput on this form some of u guys in here.

thanks
will

 

0903
Diagnostic Trouble Code 0903 indicates a problem with the Evaporative Emission (EVAP) Canister Vent Control Valve or its associated electric circuit.

This part is used by the Engine Control Module to perform the fuel system leak test. Since it is used only for self-diagnosis your engine will run perfectly well despite the dashboard Malfunction Indicator Lamp.

The EVAP canister and this valve are located under the car, near the rear left tire. You might check to make sure all the electrical connectors in that area are secure.


I think you messing with the 0402 is causing the 0903
http://forums.maxima.org/showthread....highlight=0402

KS, check the harness and clean the grounds on the Lower IM.

 

thanks but i looked in the 4th gen sticky about the codes and i've clean the crap out of the grounds on the lower im. and the 0402 code has been there for a year and i never threw the 0903 code until recently

 

im going to try and work on this evap thing before i go to work and see if i can solve it, or if anything seems wrong with it at all. i just cant justify buying another damn knock sensor.

 

I dont think the KS is dead, test it with the Ohm meter.

 

I got rid of the 0402 code and I cleaned the grounds and I even undid the ks from under the manifold and zip tied it to a hose and its still throwing a code. that's y I think my harness might be bad. I opened the harness up and inside it seemed the electrical tape they used seemed to have melted into some kind of goo. I tried to buy a new harness n nissan told me that its part of the main harness and its not sold seperatly. u guys know where I can get one. I think I might need to buy the tool to check the resistance.

lastly do u think the 0903 code could be making my ks code come up.

ohh im sendin this from my cell phone so sorry for the long paragraph

 

I have one off an 00 motor, I am pretty sure it will fit(I will double check), you can have it for 15shipped.

 

double check and let me kno, if it fits send me ur paypal info n u have a deal

 

hey kelvo u check that yet

 

do u use lower than 91 octane? i know it can hurt the ks...how long does it take to mess up a ks wen using lower grades of gas? i have 0903 also, it popped up wen i changed an o2 sensor, if u resolve urs let me know wut u did...

 

i run the highest octane like 93 or so