KADE- Throwing knock sensor code, but odd symptoms?

[waxball88]

My car recently started mis-firing in the 4th cylinder, pulled the plug and it was fouled, i lose fuel pressure if i let it sit, and get shitty gas mileage, so i assumed the injector was stuck open. Also once i get in to the upper RPMS it runs fine, also leading me to think it was meerly an injector problem. Tried 3 spares i had laying around and mysteriously get the same symptoms with all of them. I Just pulled codes and got a 34 which is the knock sensor. Do these symptoms seem right for a bad knock sensor? Obviously i am going to replace it and find out. Just wanted to see if anyone else has had the same problem.

[BoostSlideWayz]

I would check that cyls pressure... If its up to spec. then you know its fuel.

[waxball88]

I would check that cyls pressure... If its up to spec. then you know its fuel.
I forgot to post that, have good compression. The knock sensor code is throwing me off though. I'm trying to locate an injector...

[S14-SLIDER]

dont replace the knock senser its 150 bucks at autozone and it dosent do shit eccept to detect knocks and prevents the car from detinating..problly alot of gunk in the injecters or fuel filter or fuel prssure

[nismoman]

dont replace the knock senser its 150 bucks at autozone and it dosent do shit eccept to detect knocks and prevents the car from detinating..problly alot of gunk in the injecters or fuel filter or fuel prssure

You can get a knock sensor for like $40 bucks just not from autozone. A malfunctioning knock sensor can cause some strange issues esp if it works intermittently. Def replace it but you may have another issue.

[nismo racer]

ya, knock sensor can cause that. itll also make your car throw weird ass codes, nissans tend to do that.

is the injector wet when you pull it out?

[waxball88]

I'm really leaning towards my injector o-rings (though i tried 3-different ones.) If that doesn't fix it then i'll move on to the knock sensor. I'll keep everyone posted on how it turns out in case anyone stumbles along the same problem.

[skizsystem]

let me know how this turns out for you im having the same issue

[waxball88]

No dice on replacing the injector o-rings, the mis fire doesn't seem as bad and again seems to go away/become less apparent at higher rpms. I'm going to try switching an injector from a cylinder that is not mis-firing to see if that helps.

[waxball88]

It was the injector, replaced with one out of a running cylinder and the problem moved with the injector, luckily i tried ANOTHER spare and it worked, the problem is gone. Cleared codes on the ECU so we'll see if the knock sensor comes back or if it was just triggered by the misbehaving cylinder.