bad knock sensor?

[Grambos13]

What would be the symtoms of a bad knock sensor? My car idles like crap and it will not drive very good under boost. It seems like a timing issue. Deffinatly not a boost leak.

[NightStaR S13]

Im not sure about all that other stuff but have u checked the codes or have u visually inspected the knock sensor ?

[Grambos13]

Yes I've check for codes and I get 34 wich is the knock sensor. That is why I ask. If anyone knows how to time the cams on a sr correctly let me know because I think that is my biggest problem.

[SeVa-S13]

Yeah...gunna go ahead and put this in the SR section for ya.

[Grambos13]

oh woops...thanks buddy

[drifting240]

ok so what is the result on the knock sensor ordeal?? i also get code 34, which is the knock sensor, and my car acts like crap also. i have an idea of where it is, but actually can't seem to find it. so any help would be good. thanks...

[driftin_sr20det]

The knock sensor bolts on to the block, underneath the intake manifold. The plug for it is actually attached to the plug for the IACV valve. It has a two prong plug. Follow it to the sensor.

[Grambos13]

Today I took my iacv off to clean it. With that I took off the knock sensor. The knock sensor looks fine to me but that means nothing. It is super clean and everything and appears to be ok. It never gave me a problem before the rebuild. After cleaning the iacv I put everything back togeather and my car still runs like crap...

[Grambos13]

could someone with a running SR unplug their knock sensor for a second and see how their car reacts. It is the smaller plug that runs in between the intake manifold runners. there are 2 plugs there and it is the smaller of the 2.

[drifting240]

so what did you find out about the knock sensor???

[Grambos13]

havent found anything out yet...I took it off and inspected it. Everything looks fine. I want to see how a good running engine runs with it unpluged if some one is willing to experiment for us.

[drifting240]

so where exactly is it and is it hard to get to? i have an idea of where it is, but not sure...

[Grambos13]

It is right under the intake manifold. There is two plugs that run in between the intake manifold runners and it is the smaller one if you want to try unplugging it...let me know if this is unclear cause I'm kinda drunk...good ol crown n coke....haha

[Grambos13]

So last night I took out my whole wiring harness and am going through the whole thing and fixing every little thing. Its kinda messed up so I hope this helps. I've allready found out that my iacv power was never hooked up. I'll let you guys know how it turns out.

[drifting240]

alright, well let me know what you find out...i took off my knock sensor and kinda cleaned it and put it back on but it is still thowing me the 34 code on ecu....and still runs like crap....let me know what happens...

[Nismo_Freak]

It's a common problem for alot of Nissans.

The KS typically will causing intermittant missing especially at higher TPS voltages (read: load). It can get to the point where it will stumble and misfire badly.

I would just look to replace it with a known working one.

[drifting240]

ok then where can i get one?

[Nismo_Freak]

From an SR, I bet most of knock sensors are the same ones from other engines. Ie. KA, VQ, etc.