KADE- Throwing knock sensor code, but odd symptoms? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

waxball88 · 12-29-2010, 11:08 AM

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 · 12-29-2010, 11:31 AM

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

waxball88 · 12-29-2010, 11:34 AM

Quote:

Originally Posted by BoostSlideWayz

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 · 01-02-2011, 06:49 PM

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 · 01-02-2011, 07:22 PM

Quote:

Originally Posted by 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

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 · 01-02-2011, 11:56 PM

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 · 01-03-2011, 09:26 PM

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 · 01-04-2011, 02:45 PM

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

waxball88 · 01-05-2011, 04:30 PM

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 · 01-05-2011, 06:51 PM

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.

12-29-2010, 11:08 AM	#1
waxball88 Zilvia FREAK! Join Date: Jun 2009 Location: Gainesville Posts: 1,061 Trader Rating: (9) Feedback Score: 9 reviews	KADE- Throwing knock sensor code, but odd symptoms? 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.

12-29-2010, 11:31 AM	#2
BoostSlideWayz Nissanaholic! Join Date: Sep 2008 Location: Lebec Age: 32 Posts: 1,686 Trader Rating: (1) Feedback Score: 1 reviews	I would check that cyls pressure... If its up to spec. then you know its fuel. __________________ 1994 toyota supra...... n-a D= 1992 nissan 240sx KA24E-T fully Built =D

01-02-2011, 06:49 PM	#4
S14-SLIDER Zilvia Addict Join Date: Oct 2010 Location: IE,CA Age: 30 Posts: 751 Trader Rating: (5) Feedback Score: 5 reviews	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 __________________ -N/A MIATA DAILY DRIVER -93 Z32TT GT2530'S WEEKEND TRACK BEAST

01-02-2011, 11:56 PM	#6
nismo racer Zilvia FREAK! Join Date: Feb 2008 Location: the 805! Posts: 1,057 Trader Rating: (17) Feedback Score: 17 reviews	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? __________________ PEGASUS

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

01-03-2011, 09:26 PM	#7
waxball88 Zilvia FREAK! Join Date: Jun 2009 Location: Gainesville Posts: 1,061 Trader Rating: (9) Feedback Score: 9 reviews	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.

01-04-2011, 02:45 PM	#8
skizsystem Zilvia Junkie Join Date: Jul 2009 Location: Rialto Age: 30 Posts: 393 Trader Rating: (3) Feedback Score: 3 reviews	let me know how this turns out for you im having the same issue

01-05-2011, 04:30 PM	#9
waxball88 Zilvia FREAK! Join Date: Jun 2009 Location: Gainesville Posts: 1,061 Trader Rating: (9) Feedback Score: 9 reviews	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.

01-05-2011, 06:51 PM	#10
waxball88 Zilvia FREAK! Join Date: Jun 2009 Location: Gainesville Posts: 1,061 Trader Rating: (9) Feedback Score: 9 reviews	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.