what causes knock sensors to fail?

[Javi802]

I know they are sensitive when it comes to dropping and that dropping one will most likely render it useless, but what, other than dropping one causes it to fail?

Can one that has sat for a couple of months "ruin" it?


I ask because when ever i first got my sr swap running and hooked up to consult, i had a code 34.

Replaced the sensor and didn't see the code 34 again.

Removed engine to do some shit and it sat for 2 months.


Put engine back in and I'm now getting a code 34 again.


Ive already bought a new sub harness and getting a new knock sensor as well. Should both be here this week

Im only asking because I'm curious.

:2f2f::coolugh:

[angel mkiv]

I would say in a normal circumstance heat would be its main wear factor..

[anti tyler]

Did you ONLY get a knock sensor code?

[Javi802]

Yessir, thats the only code being thrown

[S14DB]

Heat and Impact are the major ones. Rare case if you over Tq it you can deform it.

I see just as many Harness issues as the Sensor.

[Javi802]

Well my engine never gets over even 180 degrees so i don't think heat is my issue.

Im hoping its just the harness. Being as the sensor i have is like 5 months old.

Im replacing both either way though sometime this week

[godsmack]

Do you have a loose exhaust? Noises from a loose exhaust can sometimes throw a knock sensor code.

[Javi802]

Yes, actually i do. Im running an open down pipe with a "fabbed" L bracket that connects it to the tranny mount. It was pretty loose.

In fact today while driving, it came loose and started dragging and making a clonking noise. Freaked me the fuck out, thought my car started knocking until i pulled over and looked underneath.


I replaced my sensor and sub harness today though and reset the ecu. Went for a little drive around the area and rechecked the codes and still a 55.

I noticed the previous sensor wasn't clipped in to the harness all the way though. I could actually wiggle it. I believe i bent the little metal clip that holds it in when i previously replaced the sensor. Maybe it wasn't making a proper connection..? Who knows.

[Kingtal0n]

some engines sit for 8-10 years on a shelf from Japan before they find owners. And they usually fire up no problem.

Its always scary the first time you turn it over though.
fwiw- never had a knock sensor go bad on an sr20det.

[Javi802]

Hmm.

Guess its a waiting game now to see if a code 34 comes back. Hoping it doesn't