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Knock Sensor Trivia - FUN FOR ALL AGES - not really

 
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Old 08-03-2013, 08:21 PM
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Knock Sensor Trivia - FUN FOR ALL AGES - not really

Well for anyone that read my other post ((located here) you'll know that my lude was recently flooded.

Been trying to get it running again properly and have had a little luck but not a ton.

After getting things to dry out I got the car to run and I took it around the block. It threw a check engine light and was running like hell, timing was WAY out and it was misfiring and backfiring all around the block.. and it would die every time I came to a stop.


Flash forward to now the car was throwing a CEL, I pulled the code it gives me 2 long blinks and 3 short ones.. code 23, knock sensor. My car had ZERO problems until this flood so I know the physical knock sensor is still good. I am worried about the circuit/ecu.

According to this post:
23 96-98 Civic
92-98 Prelude
94+ Integra
KS (Knock Sensor) defective circuit or unplugged / defective sensor
* invalid code for V6 engine

I pulled the plug off today and sprayed WD-40 on everything to get rid of any moisture that was still in there. I also pulled the plugs on the ecu and put dialectric grease on the plugs to remove any moisture as well. Did an oil change as well. There was absolutely no water in the oil.

Hooked everything back up, hooked battery up.. started car up and let it idle for about 10 minutes until it was up to temp. Sounded good and was idling just fine, no codes or anything.

Went out and drove it a few miles and everything was great.. ran just fine and everything.

Came back home finished cleaning up and then the girlfriend and I took off back to her house.. about 3/4 of the way there I downshifted and took off a little bit just to see how it would act.. sure enough I hit about 5k and the CEL pops.

But now the car DOESN'T die when I come to a stop.. but I still get code 23..


Input?
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Old 08-04-2013, 07:31 AM
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Re: Knock Sensor Trivia - FUN FOR ALL AGES - not really

Knock sensor is a microphone that listens for knocking. When it hears or thinks it hears knocking it stops it flow of current or sends a flow I forget which... a circuit. I doubt it got wet as it's about as high as the shift knob in a level line sense.
It doesn't cause the motor run lousy, just does a sort of rev limiter thing..

Maybe humidity is bugging the connection point or.... maybe it's bad.
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Old 08-04-2013, 11:44 AM
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Re: Knock Sensor Trivia - FUN FOR ALL AGES - not really

The issue here is that everything was 100% perfect before the rain, knock sensor didnt get wet but when the car dried out and I ran it it would die every time I pressed the clutch in.. Now it doesn't die but I still get code 23, and yes i reset the ecu
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Old 08-04-2013, 02:52 PM
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Re: Knock Sensor Trivia - FUN FOR ALL AGES - not really

Maybe the condensation caused a short... Or water got under your hood and caused a short. That's what it sounds like to me. It randomly happened after rain, idk if condensation can cause a short but I would trace the wiring
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Old 08-04-2013, 03:20 PM
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Re: Knock Sensor Trivia - FUN FOR ALL AGES - not really

Nothing a couple of bars of plastique can't fix.

Take a blow dryer to the knock sensor and to the other end of the harness, and keep it on high for about 10 minutes, just to remove any moisture. Flood cars are a nightmare because the system grounds to the water and shorts out everything. If you had removed the battery during the rainfall, you'd probably wouldn't be so bad off.

If you di-electric grease the connection, after drying out the connector, and you still get it, i'd look at the condition of the cat and any other part of the exhaust, it's happened where a hole in the exhaust counts at a knock. The noise is coming from somewhere
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Old 08-05-2013, 12:05 PM
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Re: Knock Sensor Trivia - FUN FOR ALL AGES - not really

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Originally Posted by Sideswipe SI View Post
Nothing a couple of bars of plastique can't fix.

Take a blow dryer to the knock sensor and to the other end of the harness, and keep it on high for about 10 minutes, just to remove any moisture. Flood cars are a nightmare because the system grounds to the water and shorts out everything. If you had removed the battery during the rainfall, you'd probably wouldn't be so bad off.

If you di-electric grease the connection, after drying out the connector, and you still get it, i'd look at the condition of the cat and any other part of the exhaust, it's happened where a hole in the exhaust counts at a knock. The noise is coming from somewhere
Yeah I had a space heater in the car for about 4 hours one day while it was super hot outside as well. I am sure the harness dried out inside..


I think the only demon I am currently struggling with is the humidity.. no matter how dry I get the inside it rains again the next day and I get inside the car and see moisture on the shift knob.. maybe I'll sit a bucket of rice in there for a few days.

My dad just keeps telling me give it time and it should all get back to normal.

Thinking about it now though I did notice a little split in the flex pipe when I was under there..
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Old 09-23-2013, 12:25 AM
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Re: Knock Sensor Trivia - FUN FOR ALL AGES - not really

97Prelude,Hope you fixed your problem. how hard was it to remove the KS. Im getting Code 23, don't know if the guy that did my timing belt broke the KS or just did not plugged it back on. What do you all think of buying a $15 dollar KS on ebay instead of having to buy a $100 from autozone.
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Old 09-26-2013, 08:15 PM
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Re: Knock Sensor Trivia - FUN FOR ALL AGES - not really

Oh man. i feel your pain. Well with the knock sensor error anyway. my car has not been flooded but i get the dreaded error 23. I have tried wiring in 1,2 and even 3 transducers to see if i can trick the ECU into thinking that it has a working knock sensor but with no success. im stumped. i either need to get better transducers or i need to rewire the whole thing or even change my ecu. Have your checked your ECU?

also to the guy above me, I would be careful with Knock sensor that you buy off ebay. alot of the time they don't work. Im pretty sure I have an ebay one in there atm, and it has not fixed the issue at all.
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Old 04-21-2014, 09:02 PM
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Re: Knock Sensor Trivia - FUN FOR ALL AGES - not really

Update:

The car recently had a new timing belt, water pump, valve cover gasket, full exhaust (header, cat, o2 sensor, cat-back) and a new knock sensor installed among some other exterior items.

Still getting code 23.. my only other guess at this point is I need a different ecu.. everything was perfect before the rain, so there has to be a short on the ecu, right?

Moving to Texas soon and would really like to get it cleared up before I have to get inspected. The car idles like crap when code comes on and falls on its face in the top end, so I don't want to just pull the bulb and ignore it.
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