knock sensor
Thread Starter
Instructor
Joined: May 2006
Posts: 131
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From: seattle wa
knock sensor
i'm getting different responses from people with the idea that a gear drive might work with knock sensors and that it wont work so i am going to put the question to the test i'm puting one in my 85 and i will find out my knock sensor last year was not conected and replaced it don't know how long it was disconected anyhow the therory of plumers tape on the threads of the knock sensor is what i'm try'n like i said i have to know. also i was wondering is there a way to reprogram the chip to bye pass sensor any thoughts . thanks
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Unsure on your year but later ECM programming has setting for knock sensor and the amount / time spark is retarded when knock registered.
A resistor can be used in place of the KC so the ECM thinks it is still there and functioning.
A resistor can be used in place of the KC so the ECM thinks it is still there and functioning.
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
That being said any type of thread sealant/tape will decrease the sensitivity of the sensor to answer the OP's question. A resistor in place of the KS will only fool the ECM into thinking the KS is present and do nothing to adjust timing if there is knock. Some people who wish to disable the KS use one so they do not get a SES light.
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
VERBATIM from my 96 FSM page 6-458
"The Knock Sensors produce an AC voltage that is sent to the KS module. The amount of AC voltage is proportional to the amount of Knock.
An operating engine produces a normal amount of engine mechanical vibration (noise). The knock sensors will produce an AC voltage signal from this noise."
You are talking out of your **** orifice again.
"The Knock Sensors produce an AC voltage that is sent to the KS module. The amount of AC voltage is proportional to the amount of Knock.
An operating engine produces a normal amount of engine mechanical vibration (noise). The knock sensors will produce an AC voltage signal from this noise."
You are talking out of your **** orifice again.
A knock sensor does not "generate " any AC voltage. You might consider it to condition DC voltage.A knock sensor returns a steady DC baseline voltage to the ECM. When knock occurs the resistance in the sensor changes causing that DC voltage level to spike.Just because a voltage changes does not make it AC voltage. That can only be done with a transformer. If you use an Oscope to look at the KS you are looking at alternating DC voltage.
That being said any type of thread sealant/tape will decrease the sensitivity of the sensor to answer the OP's question. A resistor in place of the KS will only fool the ECM into thinking the KS is present and do nothing to adjust timing if there is knock. Some people who wish to disable the KS use one so they do not get a SES light.
That being said any type of thread sealant/tape will decrease the sensitivity of the sensor to answer the OP's question. A resistor in place of the KS will only fool the ECM into thinking the KS is present and do nothing to adjust timing if there is knock. Some people who wish to disable the KS use one so they do not get a SES light.
Last edited by MK 82; Sep 7, 2008 at 06:22 PM.
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
A transformer steps AC voltage up or down. It does not change from or to DC or AC.
You may claim to be an electrician but I hold a BS in Electrical Engineering.
Stick to pulling wire.
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
As far as a AC to DC transformer(convertor) goes
http://parts.digikey.com/1/parts-cat...l-transformers
http://www.amazingoutlet.com/1amp-12...er-supply.html
I could post links all day. In reality it may be a voltage rectifier but many layman refer to it as a transformer.But I am sure you knew that. Keep using your BS degree.
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Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
VERBATIM from my 96 FSM page 6-458
"The Knock Sensors produce an AC voltage that is sent to the KS module. The amount of AC voltage is proportional to the amount of Knock.
An operating engine produces a normal amount of engine mechanical vibration (noise). The knock sensors will produce an AC voltage signal from this noise."
You are talking out of your **** orifice again.
"The Knock Sensors produce an AC voltage that is sent to the KS module. The amount of AC voltage is proportional to the amount of Knock.
An operating engine produces a normal amount of engine mechanical vibration (noise). The knock sensors will produce an AC voltage signal from this noise."
You are talking out of your **** orifice again.
And just where is this KS module located?I am sure you know the difference between produce and generate correct?
This would not be the first time the FSM used the wrong terms. If it read alternating voltage instead of current I would agree.
Last edited by Redeasysport; Sep 7, 2008 at 07:14 PM.
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
As usual you spout crap and then tap dance around it. Take it up with the folks who designed the car and wrote the FSM. The AC voltage comes from the knock sensor. Virtually all one wire knock sensors produce an AC voltage. It is a sine wave of varying frequency and intensity.
Well in reality if your degree is true you know AC (alternating current)refers to both the negative and positive parts of a sine wave. The is no negative voltage in a Corvette what you refer to is a conditioned DC voltage going from a baseline voltage to a higher voltage and back down to the baseline voltage. It is not current that is alternating it is voltage based on varying resistance. The current remains the same.
And just where is this KS module located?I am sure you know the difference between produce and generate correct?
This would not be the first time the FSM used the wrong terms. If it read alternating voltage instead of current I would agree.
And just where is this KS module located?I am sure you know the difference between produce and generate correct?
This would not be the first time the FSM used the wrong terms. If it read alternating voltage instead of current I would agree.
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
More tap dancing. You used the word transformer. Spin it how you will.
How was your unpaid vacation?
How was your unpaid vacation?
You may hold a BS but that doesn't make you right There is no AC in a corvette period.That of course excludes the primary side of the alternator.
As far as a AC to DC transformer(convertor) goes
http://parts.digikey.com/1/parts-cat...l-transformers
http://www.amazingoutlet.com/1amp-12...er-supply.html
I could post links all day. In reality it may be a voltage rectifier but many layman refer to it as a transformer.But I am sure you knew that. Keep using your BS degree.
As far as a AC to DC transformer(convertor) goes
http://parts.digikey.com/1/parts-cat...l-transformers
http://www.amazingoutlet.com/1amp-12...er-supply.html
I could post links all day. In reality it may be a voltage rectifier but many layman refer to it as a transformer.But I am sure you knew that. Keep using your BS degree.
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
As usual you spout crap and then tap dance around it. Take it up with the folks who designed the car and wrote the FSM. The AC voltage comes from the knock sensor. Virtually all one wire knock sensors produce an AC voltage. It is a sine wave of varying frequency and intensity.
http://www.wellsmfgcorp.com/pdf/counterp_v4_i4_2000.pdf
I am not tap dancing I am telling you and the world the FSM has a term wrong in it big deal it is not the first time it has been pointed out to be in error. It isn't the bible.No KS produces an AC voltage period. It produces a DC wave signal if you have the degree you say you should be able to explain the difference.
It is produced by a piezoelectric crystal can you tell me how? No tap dancing now show me your degree.
Now back to the OP with a 1 wire KS the block is ground so using anything that will interfere with it contacting the block will cause issues.
http://www.youtube.com/watch?v=0xI94ZDF54Y
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
The ECM will check the KS on start up and if it isn't working it will set a fault.
Last edited by Redeasysport; Sep 7, 2008 at 09:04 PM.
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
And regardless of the AC/DC sinewave flux generastor effect ,
the correct resistor will trick the ECM into thinking the KC is present and working correctly.
You just need to have a ear for engine pinging like the old days before electonics and KC's.
I only have a degree in BS though.
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
And regardless of the AC/DC sinewave flux generastor effect ,
the correct resistor will trick the ECM into thinking the KC is present and working correctly.
You just need to have a ear for engine pinging like the old days before electonics and KC's.
I only have a degree in BS though.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 7
From: Tampa Florida
Vettlag,
Gear drives in a knock sensor equiped vehicle is not recommended by the manufacturer for a reason....but you can give it a shot if you must.
So good luck with that... let us know how it turns out.
Guys,
The knock sensor is a voltage generator all by itself....hense the 1 wire.
To better understand the whole process here is a link:
http://www.autoshop101.com/forms/h38.pdf
Gear drives in a knock sensor equiped vehicle is not recommended by the manufacturer for a reason....but you can give it a shot if you must.
So good luck with that... let us know how it turns out.
Guys,
The knock sensor is a voltage generator all by itself....hense the 1 wire.
To better understand the whole process here is a link:
http://www.autoshop101.com/forms/h38.pdf