Knock Snesor & o2 sensor? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SkunX · 02-10-2007, 12:58 PM

well It's been doing this since I got the car a few months ago..I just swapped in a rebuilt KA, so I'm sure it's not the motor alone casuing this (the shop that did the install used all my old sensors)...It's a '93 5-spd

Long story short my cars throwing a code for the O2 sensor and the Knock sensor, It won't rev past 5.5k at WOT in gear or not...If I slowly increase my pressure on the gas pedal I can get it to 6k sometimes...While actually driving though it stops making any power past 5k..It's bounching off it like theres a limiter..Would the knock sensor be causing this?..or a combination of the knock sensor and o2 sensor? I already tried unplugging the 5th and 4th gear sensor which didn't change a thing..

Any help would be greatly apperciated before I drop a fair amount of cash on the o2 and knock sensor...

Also is $300 about normal for a brand new oem knock sensor? (thats about the pricing I can find around here)

HalveBlue · 02-10-2007, 01:43 PM

A problem with the Knock Sensor and 02 Sensor will result in your car running abnormally rich.

You can get an OEM replacement KS for ~$150.

A word of caution, the Knock Sensor is a pain in the ass to get to unless you know what you're doing. If you do plan on replacing it (and you should if you wan the engine to run right) make sure you lift the car and get to it from underneath.

Good Luck!

SkunX · 02-10-2007, 01:50 PM

So is it as easy (I use this word lightly..lol) taking the old one out and putting the new back in? or are there other things I need to worry about?

and sorry for asking so many questions..one more..lol I understand it would cause the car to run rich...Would that cause the reving problem?

Jung918 · 02-10-2007, 01:55 PM

If it has happened since you got the car, then check and make sure the knock and o2 sensor is pluged in and the wires are good.

http://www.courtesyparts.com/secondtier_s13.html

it has a pic of the knock sensor if you scroll down.

SkunX · 02-10-2007, 02:05 PM

well I just looked around under my hood and from what I can see the knock sensor isn't even hooked up..Wouldn't this thorw a CEL? and also can some one describe where the harness for it would be roughly so I can find the plug and plug it back in..lol

SkunX · 02-10-2007, 04:40 PM

pmuB

msglngth

idlafie · 02-11-2007, 02:36 AM

Take your car back to the shop that did the install & have them check your sensors. A defective knock sensor will not turn on your CEL..a bad O2 sensor will!! Have the shop check your Engine Coolant Temperature Sensor along with both your front & rear O2 sensors. Have them also check your cam shaft sensor...????...can't remember the name at the moment...the one that sits behind your motor and above the tranny. The shop could have damaged it when they were installing your motor.
Hopefully the above info comes in useful.
ID

SkunX · 02-11-2007, 08:58 AM

I really don't want to deal with that shop anymore..Overpaid for ok work...I guess Monday I can swing by there and see if they'll do it for free (I'm short on cash at the moment)...

The odd part is I got a code for my O2 sensor on my ECU but no CEL ever came on.

02-10-2007, 12:58 PM	#1
SkunX Leaky Injector Join Date: Dec 2006 Location: Crystal River, Florida, USA Age: 35 Posts: 62 Trader Rating: (0) Feedback Score: 0 reviews	Knock Snesor & o2 sensor? well It's been doing this since I got the car a few months ago..I just swapped in a rebuilt KA, so I'm sure it's not the motor alone casuing this (the shop that did the install used all my old sensors)...It's a '93 5-spd Long story short my cars throwing a code for the O2 sensor and the Knock sensor, It won't rev past 5.5k at WOT in gear or not...If I slowly increase my pressure on the gas pedal I can get it to 6k sometimes...While actually driving though it stops making any power past 5k..It's bounching off it like theres a limiter..Would the knock sensor be causing this?..or a combination of the knock sensor and o2 sensor? I already tried unplugging the 5th and 4th gear sensor which didn't change a thing.. Any help would be greatly apperciated before I drop a fair amount of cash on the o2 and knock sensor... Also is $300 about normal for a brand new oem knock sensor? (thats about the pricing I can find around here)

02-10-2007, 01:55 PM	#4
Jung918 Post Whore! Join Date: Oct 2003 Location: CA Posts: 3,203 Trader Rating: (2) Feedback Score: 2 reviews	If it has happened since you got the car, then check and make sure the knock and o2 sensor is pluged in and the wires are good. http://www.courtesyparts.com/secondtier_s13.html it has a pic of the knock sensor if you scroll down. __________________ Sale: Hello Kitty Horn Button S14 Rear Valences K.Y. Gordon the Thief (Tony Chen)

02-10-2007, 02:05 PM	#5
SkunX Leaky Injector Join Date: Dec 2006 Location: Crystal River, Florida, USA Age: 35 Posts: 62 Trader Rating: (0) Feedback Score: 0 reviews	well I just looked around under my hood and from what I can see the knock sensor isn't even hooked up..Wouldn't this thorw a CEL? and also can some one describe where the harness for it would be roughly so I can find the plug and plug it back in..lol Last edited by SkunX; 02-10-2007 at 09:50 PM..

02-11-2007, 02:36 AM	#7
idlafie Zilvia Addict Join Date: Mar 2004 Location: ..So Cal.... Posts: 940 Trader Rating: (0) Feedback Score: 0 reviews	Take your car back to the shop that did the install & have them check your sensors. A defective knock sensor will not turn on your CEL..a bad O2 sensor will!! Have the shop check your Engine Coolant Temperature Sensor along with both your front & rear O2 sensors. Have them also check your cam shaft sensor...????...can't remember the name at the moment...the one that sits behind your motor and above the tranny. The shop could have damaged it when they were installing your motor. Hopefully the above info comes in useful. ID __________________ Weekend Mechanic for my Not-So-Mechanically-Inclined buddies....

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02-10-2007, 01:43 PM	#2
HalveBlue Zilvia FREAK! Join Date: Mar 2004 Location: I'm somewhere where I don't know where I am! Posts: 1,549 Trader Rating: (0) Feedback Score: 0 reviews	A problem with the Knock Sensor and 02 Sensor will result in your car running abnormally rich. You can get an OEM replacement KS for ~$150. A word of caution, the Knock Sensor is a pain in the ass to get to unless you know what you're doing. If you do plan on replacing it (and you should if you wan the engine to run right) make sure you lift the car and get to it from underneath. Good Luck!

02-10-2007, 01:50 PM	#3
SkunX Leaky Injector Join Date: Dec 2006 Location: Crystal River, Florida, USA Age: 35 Posts: 62 Trader Rating: (0) Feedback Score: 0 reviews	So is it as easy (I use this word lightly..lol) taking the old one out and putting the new back in? or are there other things I need to worry about? and sorry for asking so many questions..one more..lol I understand it would cause the car to run rich...Would that cause the reving problem?

02-10-2007, 04:40 PM	#6
SkunX Leaky Injector Join Date: Dec 2006 Location: Crystal River, Florida, USA Age: 35 Posts: 62 Trader Rating: (0) Feedback Score: 0 reviews	pmuB msglngth

02-11-2007, 08:58 AM	#8
SkunX Leaky Injector Join Date: Dec 2006 Location: Crystal River, Florida, USA Age: 35 Posts: 62 Trader Rating: (0) Feedback Score: 0 reviews	I really don't want to deal with that shop anymore..Overpaid for ok work...I guess Monday I can swing by there and see if they'll do it for free (I'm short on cash at the moment)... The odd part is I got a code for my O2 sensor on my ECU but no CEL ever came on.