didnt pass smog! engine knock sensor
Thread Starter
Melting Slicks
Joined: Mar 2004
Posts: 2,437
Likes: 59
From: Bay Area (Danville) CA
didnt pass smog! engine knock sensor
Well my smog failed today and the tech told me it was because of the engine knock sensor. My check engine light has been on for a few months. But my engine doesn't knock!
The tech was tellin me that my bass from the stereo setup could possibly trigger the knock sensor.......i have no idea if this is a possibility...
So he told me to clear the code and drive 100 miles without using the sound system.
what do I do? Where is the knock sensor located incase i need to swap it?
thanks
The tech was tellin me that my bass from the stereo setup could possibly trigger the knock sensor.......i have no idea if this is a possibility...
So he told me to clear the code and drive 100 miles without using the sound system.
what do I do? Where is the knock sensor located incase i need to swap it?
thanks
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
You need to post what DTC (or DTCs) are set in your car. If you don't know how to display the DTC data, go here ....
https://www.corvetteforum.com/techti...D=26&TopicID=1
It is easiest to write down the codes once the car goes into MANUAL mode at the end of the automatic display. Post the ENTIRE DTC ... they look something like P1234C .... the P tells us it is a Powertrain code ... the 1234 is the code ...... (and there might be a Body 1234 so we need that leading letter) and at the end is a "C" or an "H" (sometimes both) showing if the code is Current or History.
There are two KR (Knock Retard) sensors on the engine. They are located under the intake manifold, in the engine "valley" between the heads. You would need one MONSTER stereo system for the bass notes to trigger the KR system ... but anything is possible.
The DTC will tell us what your problem is.
https://www.corvetteforum.com/techti...D=26&TopicID=1
It is easiest to write down the codes once the car goes into MANUAL mode at the end of the automatic display. Post the ENTIRE DTC ... they look something like P1234C .... the P tells us it is a Powertrain code ... the 1234 is the code ...... (and there might be a Body 1234 so we need that leading letter) and at the end is a "C" or an "H" (sometimes both) showing if the code is Current or History.
There are two KR (Knock Retard) sensors on the engine. They are located under the intake manifold, in the engine "valley" between the heads. You would need one MONSTER stereo system for the bass notes to trigger the KR system ... but anything is possible.
The DTC will tell us what your problem is.
Burning Brakes
Joined: Aug 2007
Posts: 756
Likes: 1
From: Oakton Virginia
Dump your codes and it should tell you which one is malfunctioning. I disconnected my harness while doing my heads, forgot to reconnect and got a 0326 or 0327, or both.
Last edited by PewtVette; May 4, 2008 at 09:32 PM.
Burning Brakes
Joined: Jul 2004
Posts: 932
Likes: 0
From: Las Cruces New Mexico
My engine light kept coming on for a year or more and code P0332 rear knock sensor. I replaced the sensors 3 time, the wiring harness once and the dumb thing still keeps coming on from time to time but engine runs fine. If you clear the codes you can probably drive for several hundred miles without the light coming on and you will probably pass smog test. I have gotten to the point where I just ignore it and clear codes as soon as I get to a stopping point. Good luck.
Thread Starter
Melting Slicks
Joined: Mar 2004
Posts: 2,437
Likes: 59
From: Bay Area (Danville) CA
well i erased all the codes today. so im praying it will stay off during my drive to work tomorrow (200 miles round trip). I have cleared it before and it always comes back on. So if it does go back on, ill post the codes.
The bad part is my registration is due next week!
thanks for everyones input/info
The bad part is my registration is due next week!
thanks for everyones input/info
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Clearing the DTCs will do NOTHING for your emissions test but cause it to fail. The PCM needs to see ZERO emissions fail flags for a set number if drive cycles before it will allow you to pass the test. As BLACKZO6 recommended ,,,,,,read the DTCs and then post the error Codes, That will allow us to tell you what to do to reslove the problem.
Read and post the DTCs,
BC
Read and post the DTCs,
BC
Racer
Joined: Apr 2008
Posts: 408
Likes: 6
From: Santa Clarita CA
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Thread Starter
Melting Slicks
Joined: Mar 2004
Posts: 2,437
Likes: 59
From: Bay Area (Danville) CA
Well I made it about 70 miles today until the light went on. I parked to get gas, then when i started her back up, the light came on.
here are the codes it shows...
10 PCM P0327H C
B0-RFA C2110H C
So what are these and what should i do?
thanks.
here are the codes it shows...
10 PCM P0327H C
B0-RFA C2110H C
So what are these and what should i do?
thanks.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
This could be due to a wiring problem to the sensor, or a sensor that is loose or overtightened, or a bad sensor.
Part number for a new sensor is 10456222 for a 1997.
C2110 is your Right Rear Tire Pressure Monitor is not transmitting tire pressure data. You need to replace the sensor in the wheel. This will not affect your smog check, but will get rid of those annoying SERVICE TPMS messages on your DIC.
Part number for a new sensor for a 1997 is
10438853 - sensor
15234846 - nut
25715243 - grommet
You should get a new grommet ... you can re-use the nut. If you haven't replaced sensors before this the batteries are coming to the end of their lives .... you will probably have other sensors go out in the near future ... you might want to consider replacing all 4 now.
Burning Brakes
Joined: Feb 2005
Posts: 1,201
Likes: 14
From: Honolulu, HI
Thread Starter
Melting Slicks
Joined: Mar 2004
Posts: 2,437
Likes: 59
From: Bay Area (Danville) CA
P0327 indicates that the FRONT knock sensor is providing a signal voltage lower than expected.
This could be due to a wiring problem to the sensor, or a sensor that is loose or overtightened, or a bad sensor.
Part number for a new sensor is 10456222 for a 1997.
C2110 is your Right Rear Tire Pressure Monitor is not transmitting tire pressure data. You need to replace the sensor in the wheel. This will not affect your smog check, but will get rid of those annoying SERVICE TPMS messages on your DIC.
Part number for a new sensor for a 1997 is
10438853 - sensor
15234846 - nut
25715243 - grommet
You should get a new grommet ... you can re-use the nut. If you haven't replaced sensors before this the batteries are coming to the end of their lives .... you will probably have other sensors go out in the near future ... you might want to consider replacing all 4 now.
This could be due to a wiring problem to the sensor, or a sensor that is loose or overtightened, or a bad sensor.
Part number for a new sensor is 10456222 for a 1997.
C2110 is your Right Rear Tire Pressure Monitor is not transmitting tire pressure data. You need to replace the sensor in the wheel. This will not affect your smog check, but will get rid of those annoying SERVICE TPMS messages on your DIC.
Part number for a new sensor for a 1997 is
10438853 - sensor
15234846 - nut
25715243 - grommet
You should get a new grommet ... you can re-use the nut. If you haven't replaced sensors before this the batteries are coming to the end of their lives .... you will probably have other sensors go out in the near future ... you might want to consider replacing all 4 now.
thanks for the info! im not worried about the tire pressure sensor.....but the knock sensor-----DAMN! That sounds expensive to have replaced. Im not to sure I wanna get into pulling the manifold myself. How hard is the sensor replacement and is there anything to check before i go that route?
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
thanks for the info! im not worried about the tire pressure sensor.....but the knock sensor-----DAMN! That sounds expensive to have replaced. Im not to sure I wanna get into pulling the manifold myself. How hard is the sensor replacement and is there anything to check before i go that route?
Once the manifold is off replacing the sensor is a 3 minute job .... disconnect electrical connection ... unscrew ... and screw in new sensor ...(tighten to 15 lb/ft)
Call your dealer/service shop and get a quote on replacing the knock sensor .... that will help you decide whether you want to do it yourself or not.
Safety Car
Joined: Jul 2001
Posts: 4,661
Likes: 67
From: Ocean Springs MS
Clearing the DTCs will do NOTHING for your emissions test but cause it to fail. The PCM needs to see ZERO emissions fail flags for a set number if drive cycles before it will allow you to pass the test. As BLACKZO6 recommended ,,,,,,read the DTCs and then post the error Codes, That will allow us to tell you what to do to reslove the problem.
Read and post the DTCs,
BC
Read and post the DTCs,
BC
1. Ask for advice.
2. Ignore advice, and do it your own way.
3. Come back and ask for more advice.
4. Follow original advice.
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
If the sensors aren't rusted from water infiltration, thay can go bad by the seals in the bottom letting oil in. My rear sensor went bad, I replaced both sensors, the wiring pigtail that connects them both to the outside and the oil seals on the bottom. Did it off/on over the weekend part time between mowing the lawn and doing other chores. Take your time and DON'T forget the vacuum lines on the rear of the manifold. Kind of wish I relocated the oil pressure sensor at the same time. Mine's OK but it's probably enevetable it will eventually freak out.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Intake manifold removal is a cake walk! If you or any one has ever WASHED the engine, that could explain the knock sensor issue. The sensor sit in a well and water can leak in to the well that they sit in and cause them to fail.
I recommend removing the intake and examining /repairing the sensors. It isn't as difficult as it sounds.
BC
I recommend removing the intake and examining /repairing the sensors. It isn't as difficult as it sounds.
BC
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Yes they do. I just saw mine for the first time during my heads cam swap and the wires were not as pliable as I would have liked them to be. They were also turning different colors. Part of the green wire was a very light green.
The wires were whole and not cracked so I left them alone. If I had a bad knock sensor harness, I would just rewire it myself. Hell,,it's only has TWO wires to a two wire connector.
Thread Starter
Melting Slicks
Joined: Mar 2004
Posts: 2,437
Likes: 59
From: Bay Area (Danville) CA
ok it sounds like i might have to tackle it myself. any write ups on this by any chance?
i wonder how much the sensors are....... and yes i have washed the engine
i won't be doing that ever again.
thanks for the helpful input. and those with the bs comments, thanks for polluting the thread.
i wonder how much the sensors are....... and yes i have washed the engine
i won't be doing that ever again.thanks for the helpful input. and those with the bs comments, thanks for polluting the thread.
