ATS*Mark

sup guys , im throwing a knock sensor code after my headgasket change , just wondering possible causes ....also what does the plug look like that plugs into the knock sensor.....and where is it located?

B_CRUZ!

I know for the b's its located on the back of the motor... maybe you forgot to plug it back up?

ATS*Mark

thats what im thinkin ....anybody with an ex???

RyanEJ8

Its on the back of the block, light blue colored.

ATS*Mark

where on the block is it located , what is it near?

B_CRUZ!

oil filter.

ATS*Mark

what does the plug look like that goes into the knock sensor.....cause i have a leftover plug LOL....its a 2 prong female plug with one green wire and one red wire

ATS*Mark

bumpizzle

B_CRUZ!

thats it you dummy really it is.

ATS*Mark

now i dont know if it is because there are 5 different code 23's in the book....and none of them are knock sensor ahahah....santos looked that one up byron heheh.

aw1234dude

edited i mean yeah its knock sensor

ATS*Mark

ya but what code 23.....there are like 5 different code 23's

and what does that mean???

aw1234dude

Do you mean while checking the code, it keeps repeating code 23? If thats your question then the answer is that its supposed to keep repeating it.

ATS*Mark

no.....in my helms it gives all the codes right.....for obd2 it breaks it down into systems.....a code 23 for ignition might be misfire.....as a code 23 for emissions might be catalyst....see what im sayin??? the only way to tell which 23 code its throwing is to hook a diagnostic tool up to it to read the full code.

B_CRUZ!

are you still running a obd2 ecu?

93hatchSI

i threw one, what cat do you have on?

Marauder

A MIL code 23 is only a knock sensor circuit malfunction. That connector that's loose is probably the one that should be connected to the knock sensor. It should be located in the middle of the block, just under the intake manifold and close to the oil filter.

RyanEJ8

I'm wondering why you might have unplugged the knock sensor to change a headgasket unless you were removing the whole engine for other reasons.

93hatchSI

is the zex working good on the single cam???

RyanEJ8

I ran a 75 shot on the stock motor for over a year with no problems except a broken axle. I upped it to 100 shot with a built motor and blew the headgasket. Now I am going turbo and leaving the nitrous in case I want to still do a small shot and boost.

ATS*Mark

my book doesnt list a code 23 for anything concerning the knock sensor , i looked it up in my book and there are 8 specific systems acording to the book:

0=entire system
1=air fuel system
2 same as above
3=ignition system
4=aux emission controls
5=speed or idle controls
6=pcm system
7= tranny/transaxle
8=non computer controlled powertrain

im thinking im throwing a P0423 , which is a heated catalyst efficiency below threshold....since i dont even have a cat on there im pretty sure its the one im throwing

Marauder

I looked it up on Mitchell online and the HELMS manual. Both list the MIL code 23 as being a knock sensor failure, or DTC code P0325. The connector is a one wire with a blue/red wire.

For an OBD2 car, there is no such code as a P0423.

ATS*Mark

how the hell!! why does it say it in my book???

ATS*Mark

i cant even find the mil codes in my book , so whats blinking on my check engine light is a mil code not a dtc code right

Marauder

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hella_JDM &raquo;</TD></TR><TR><TD CLASS="quote">i so whats blinking on my check engine light is a mil code not a dtc code right</TD></TR></TABLE>

Correct....a DTC code will be pulled thru the OBD2 port, and the MIL code is when you use a service connector, or jumper it, and read the flashes.

The HELMS manual lists the DTC codes in order with the MIL codes in ()