rear engine H23 sensor unknown

[Chaos325]

Hey, anyone know what the round sensor directly under the intake manifold on the block is for on a H23a1? It has a 2 pin connection, its kind of like and above the oil sensor. I when to plug it in today and the electrical portion just fell off and I need to know the name for locate a replacement. Thanks.

[bruno8747]

Its called a knock sensor.

[Night Wolf]

^^^ I think hes correct

[civic_90_08]

what exactly does the knock sensor do?

and will the H23 run without it hooked up?

-Jordan

[Night Wolf]

^^^ I dont think the accords F22 had one. so if it ran without one the H23 should be able to run without it too as long as you use a CB ECU. if you use the H23 ECU then I dont think it will & if it does I think itll throw out a code.

[civic_90_08]

I know the F22 doesnt have one. But i just picked up an H23 today and thats why i was asking. I just wonder how hard it is to wire it up.

-Jordan

[C91BLX7]

Its a phizo electric sensor that senses ping/knock from detonation and will retard advance timing accordingly.

With the H23 ECU and no sensor engine will run crappy

With F22 ECU engine will run crappy

[Night Wolf]

^^^ itll still run. & youll be able to drive it. it just wont be perfect

[smokeeey420]

you might want to look into removing it with a chipped ecu and a tune.

[chrischhorn]

honestly it would be worth it to just find the a plug and run the h23 ecu and run the wires to the ecu.....Would good is doin a swap if u dont get the full potential out of it anywayz

[NAiL05]

Plenty of H23 blocks laying around in junkyards. If not search on prelude power I am pretty sure someone is willing to sell you one with their partouts for cheap.

[Night Wolf]

honestly it would be worth it to just find the a plug and run the h23 ecu and run the wires to the ecu.....Would good is doin a swap if u dont get the full potential out of it anywayz

yep that would be the best way!

[Chaos325]

thanks guys, its actually for my prelude. Now I know what I'm looking for. Theres no h23 around here, I had to drive 2 hrs cross state for this replacement block alone.

[Chaos325]

is that h23 specific or can I grab one off of another motor like a b series?

[wed3k]

is that h23 specific or can I grab one off of another motor like a b series?

as far as i know, it isnt h23 specific but others will not fit. im pretty sure it is OBD specific.