I just changed my knock sensor and I have reset the ECU but I still have a CEL and it is a knock sensor code. The strange thing is that when I rev the car and it reaches about 3800 RPM's the light goes off but comes back on when it gets lower in RPM's. I have heard that you can overtighten the KS and it becomes too sensitive. Is that what I did?? or any other ideas of what could be wrong? Any help would be appreciated, Thanks.

Adam

 

The knock sensor code is a "ghost" code, so it will not trip the CEL. Were their any other codes tripped besides the knock sensor? Try resetting the CEL again, and drive the car around a bit. This will give the computer time in recognizing the new sensor and adjust to things.

 

There are no other codes being thrown, but I reset the ECU and drove around a little and the check engine light still goes off when I accelerate and come back on when I let off the gas. Why can't this stuff be simple??


Adam

 

you want simple? stay under 3500rpms. CEL fixed.

 

how could a maxima owner follow such advice, what code is the CEL giving you when you do the diagnostic? still the KS code?

 

yeah it still throws a 03 04 code, I haven't tried to clean the grounds yet because I don't have any sandpaper. Do yuo think that could be the problem?

 

possible, where did you get the knock sensor from?
try just altoghter re-installing the sensor. it sounds like a bad install . is it tightened? did you hook up the connector back up?
any other codes showing up?

let us know.

 

I got the knock sensor from the local Nissan parts dealership. I guess I will try to reinstall it again altogether. I did the install according to the instructions at skippynet. It is tightened but barely because isn't supposed to be no more than 15-20 ft-lbs?? And the only code showing is a 03 04 knock sensor code. Thanks for the help guys.

Adam

 

15-20 ft-lbs is tight...just tight enough to be broken loose with a goot yank on a wrench. Sounds like you need to tighten it.