Knock Sensor failure. Why?
03-12-2002, 07:42 PM
#1
Knock Sensor failure. Why?
Lately i see a lot of posts about failing knock sensors. Does that have anything to do with people replacing their stock intakes? I dont see any correlation, but it seems most of those cars have aftermarket intakes.
Can someone clear this up for me?
Can someone clear this up for me?
03-12-2002, 08:57 PM
#2
Re: Knock Sensor failure. Why?
Originally posted by dmBK
Lately i see a lot of posts about failing knock sensors. Does that have anything to do with people replacing their stock intakes? I dont see any correlation, but it seems most of those cars have aftermarket intakes.
Can someone clear this up for me?
Lately i see a lot of posts about failing knock sensors. Does that have anything to do with people replacing their stock intakes? I dont see any correlation, but it seems most of those cars have aftermarket intakes.
Can someone clear this up for me?
03-12-2002, 09:11 PM
#3
Re: Re: Knock Sensor failure. Why?
Originally posted by dmbmaxima88
if you've ever seen one you'd be surprised they last more then a year for what they put up with, they just happen to last 5 years or so and a lot of guys are getting to be that old.
if you've ever seen one you'd be surprised they last more then a year for what they put up with, they just happen to last 5 years or so and a lot of guys are getting to be that old.
am i making sense?
03-13-2002, 04:19 AM
#4
Re: Re: Re: Knock Sensor failure. Why?
Originally posted by dmBK
But if the knock sensor has to work overtime, wouldn't that mean that the engine is suffering big time? as far as i know, you get the knocking from poor fuel, low octane gas, timing that needs to be adjusted, and so forth. knocking=detonation? detonation=real bad.
am i making sense?
But if the knock sensor has to work overtime, wouldn't that mean that the engine is suffering big time? as far as i know, you get the knocking from poor fuel, low octane gas, timing that needs to be adjusted, and so forth. knocking=detonation? detonation=real bad.
am i making sense?
03-13-2002, 09:01 AM
#5
Re: Re: Re: Re: Knock Sensor failure. Why?
Originally posted by dmbmaxima88
when the knock sensor goes bad it goes into what is called "fail safe" mode which it makes the car think of the worst possible situation and retards the timing to that, it's for safety. it's like the transmission resistor mod on a 4th gen, if you take the resistor out of the loop it ups your line pressure, higher pressure is better then lower. your engine will never knock.
when the knock sensor goes bad it goes into what is called "fail safe" mode which it makes the car think of the worst possible situation and retards the timing to that, it's for safety. it's like the transmission resistor mod on a 4th gen, if you take the resistor out of the loop it ups your line pressure, higher pressure is better then lower. your engine will never knock.
seriously though, i need to figure out why its happening.
03-13-2002, 09:37 AM
#6
Re: Re: Re: Knock Sensor failure. Why?
Originally posted by dmBK
But if the knock sensor has to work overtime, wouldn't that mean that the engine is suffering big time? as far as i know, you get the knocking from poor fuel, low octane gas, timing that needs to be adjusted, and so forth. knocking=detonation? detonation=real bad.
am i making sense?
But if the knock sensor has to work overtime, wouldn't that mean that the engine is suffering big time? as far as i know, you get the knocking from poor fuel, low octane gas, timing that needs to be adjusted, and so forth. knocking=detonation? detonation=real bad.
am i making sense?
03-13-2002, 10:03 AM
#7
Re: Re: Re: Re: Knock Sensor failure. Why?
Originally posted by iwannabmw
I think your assuming that the failures are related to a sensor that is being overworked because of the mods everyone is using. I think the sensor is subject to a pretty harsh environment and is a life limited part. I hadn't heard the five year number before, but it makes sense since a lot of the fourth gens that have had the failure are around that time frame. I also noticed that they seem to be in the colder climates as well. Maybe the stress of going from cold temps to the normal operating temps repeatedly takes a greater toll on it too.
I think your assuming that the failures are related to a sensor that is being overworked because of the mods everyone is using. I think the sensor is subject to a pretty harsh environment and is a life limited part. I hadn't heard the five year number before, but it makes sense since a lot of the fourth gens that have had the failure are around that time frame. I also noticed that they seem to be in the colder climates as well. Maybe the stress of going from cold temps to the normal operating temps repeatedly takes a greater toll on it too.
03-13-2002, 11:30 AM
#8
The KS sits on the top of the engine, where it is subject to 300+ degree temps, moistur and vibration. While it is a rather simple piece of plastic, the inside is a delicate piezoelectric element that can only take so much abuse. A five year 'life' may be quite reasonable.
03-13-2002, 12:56 PM
#10
Originally posted by medic
so is there any simple way to tell that you have a failed knock sensor if it is auomatically hold back the engine other then lower performance?
Is there anything I can do to check or do I have to take it to the mechanic?
so is there any simple way to tell that you have a failed knock sensor if it is auomatically hold back the engine other then lower performance?
Is there anything I can do to check or do I have to take it to the mechanic?
03-13-2002, 01:10 PM
#11
Senior Member
Join Date: Sep 2001
Posts: 381
yeah, I don't have anything to read the ecu codes. I can check and fix mechanical things, but i don't really mess with the electircal stuff.
I was hoping it was like a fuse or someting you can physically inspect - I guess I'll wait until I go to the shop next time. If the car is running with a failed knock sensor it can continue to do so for a while longer.
I was hoping it was like a fuse or someting you can physically inspect - I guess I'll wait until I go to the shop next time. If the car is running with a failed knock sensor it can continue to do so for a while longer.
03-13-2002, 01:33 PM
#12
to get back to my original question - goes installing an aftermarket intake/doing OSCAI have any direct relationship to knock sensor failure? or does it fail because of the harsh underhood conditions?
03-13-2002, 01:50 PM
#13
Originally posted by medic
yeah, I don't have anything to read the ecu codes. I can check and fix mechanical things, but i don't really mess with the electircal stuff.
I was hoping it was like a fuse or someting you can physically inspect - I guess I'll wait until I go to the shop next time. If the car is running with a failed knock sensor it can continue to do so for a while longer.
yeah, I don't have anything to read the ecu codes. I can check and fix mechanical things, but i don't really mess with the electircal stuff.
I was hoping it was like a fuse or someting you can physically inspect - I guess I'll wait until I go to the shop next time. If the car is running with a failed knock sensor it can continue to do so for a while longer.
03-13-2002, 03:31 PM
#14
Supporting Maxima.org Member
Join Date: Aug 2000
Posts: 604
I don't think it has anything to do with intakes. My sister just had her's replaced and her car is stock other then springs. Btw... that's in Washington State and a 95 GXE. I'm going to go check mine right now.
03-13-2002, 05:12 PM
#15
Originally posted by dmBK
to get back to my original question - goes installing an aftermarket intake/doing OSCAI have any direct relationship to knock sensor failure? or does it fail because of the harsh underhood conditions?
to get back to my original question - goes installing an aftermarket intake/doing OSCAI have any direct relationship to knock sensor failure? or does it fail because of the harsh underhood conditions?
for a genuine Nissan part.
03-13-2002, 09:34 PM
#18
Originally posted by 96gxe
has any body tried to fix or clean the thing them selfs? Like a last dich effort before haveing it replased. Or is it to hard to get to?
has any body tried to fix or clean the thing them selfs? Like a last dich effort before haveing it replased. Or is it to hard to get to?
dose any one know how much power is being lost?
03-14-2002, 06:36 AM
#21
I just changed mine and after beating up my hands and seeing what a PITA it is to get out, the LAST thing in the world I would want to do is try to fix it and then have to replace it anyway. The odds of it being something fixable are pretty low. I don't think you have a prayer of actually fixing the knock sensor itself, but if the problem were an electrical connection somewhere it might be doable.
03-16-2002, 06:22 PM
#23
ugh..my CEL came on today with the knock sensor failure..
how much does it cost just for the part(no labor)? i called autozone but they said its a dealer only part and they arent open until monday.
thanks
how much does it cost just for the part(no labor)? i called autozone but they said its a dealer only part and they arent open until monday.
thanks
03-16-2002, 08:08 PM
#24
Senior Member
Join Date: Dec 2001
Posts: 153
Originally posted by wope
ugh..my CEL came on today with the knock sensor failure..
how much does it cost just for the part(no labor)? i called autozone but they said its a dealer only part and they arent open until monday.
thanks
ugh..my CEL came on today with the knock sensor failure..
how much does it cost just for the part(no labor)? i called autozone but they said its a dealer only part and they arent open until monday.
thanks
03-16-2002, 08:58 PM
#27
Donating Maxima.org Member
Join Date: Apr 2001
Posts: 268
Originally posted by iwannabmw
I just changed mine and after beating up my hands and seeing what a PITA it is to get out, the LAST thing in the world I would want to do is try to fix it and then have to replace it anyway. The odds of it being something fixable are pretty low. I don't think you have a prayer of actually fixing the knock sensor itself, but if the problem were an electrical connection somewhere it might be doable.
I just changed mine and after beating up my hands and seeing what a PITA it is to get out, the LAST thing in the world I would want to do is try to fix it and then have to replace it anyway. The odds of it being something fixable are pretty low. I don't think you have a prayer of actually fixing the knock sensor itself, but if the problem were an electrical connection somewhere it might be doable.
03-16-2002, 11:00 PM
#29
Originally posted by Adidas_Boy
I heard it is tripped normally in conjunction with something else failing, like the O2 sensor (front one). Normally the KS doesn't trip it, but it could.
I heard it is tripped normally in conjunction with something else failing, like the O2 sensor (front one). Normally the KS doesn't trip it, but it could.
03-17-2002, 04:52 AM
#30
Originally posted by Rutnick
How did you replace it? Did you take the intake off or did you just wedge your hand and a wrench into the intake gap? If you did it this way, did you disconnect anything to get more room? I see some sensor connections around the area.
How did you replace it? Did you take the intake off or did you just wedge your hand and a wrench into the intake gap? If you did it this way, did you disconnect anything to get more room? I see some sensor connections around the area.
03-17-2002, 07:27 AM
#32
Donating Maxima.org Member
Join Date: Apr 2001
Posts: 268
Originally posted by iwannabmw
I just squeezed my hand into the gap under the intake. I didn't need to disconnect anything, the only parts that were in the way were solid metal and not moving. Once you get your hand past the turn and under the intake, there is plenty of room to move around down there.
I just squeezed my hand into the gap under the intake. I didn't need to disconnect anything, the only parts that were in the way were solid metal and not moving. Once you get your hand past the turn and under the intake, there is plenty of room to move around down there.
03-17-2002, 12:49 PM
#37
What kind of transducer is the KS? Does it vary it's resistance or change the voltage signal to the ECU? Just wondering if we could replace it with a fixed resistor or component so that it would read a constant "no knock." I've never used anything less than Premium in my car and have got to believe that the occurance of knocking would be very rare.
03-19-2002, 05:44 PM
#40
Originally posted by MaxedOut97SE
So it can be assesed that as long as the light isn't on, don't worry about it, right?
So it can be assesed that as long as the light isn't on, don't worry about it, right?
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