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the mt2500 is indicating an engine knock. I can’t hear anything unusual and the engine seems to be running smoothly across the rpm range. There are no codes being generated. I’ve read a lot of threads on the subject and several forum members have replaced their unavailable 82 sensor with an early c4 version. It may or may not solve the problem but my question is whether a c4 sensor can be used in place of the 82 sensor.
Thanks for any feedback. This will fit 84 to 86 c4
I would think the suppliers in order to sell more knock sensors would indicate it works with 82. The part number for the 82 discontinued knock sensor on supplier sites is not the same as 84.
I would think the suppliers in order to sell more knock sensors would indicate it works with 82. The part number for the 82 discontinued knock sensor on supplier sites is not the same as 84.
thanks for the input. I still need to do some research to see if there is a diagnostic for the knock sensor. I’ve read that others simply tap the engine near the sensor to induce a knock.
But I can’t find anyone that still makes the part.
I can not remember right off the top of my head if there is a chart in the service manual for the knock sensor or not. I am having a total 'brain fart'. But io cn look and let you know tomorrow..
I do know that the one you have will work but you need to obviously change out the wiring connector.
I can not remember right off the top of my head if there is a chart in the service manual for the knock sensor or not. I am having a total 'brain fart'. But io cn look and let you know tomorrow..
I do know that the one you have will work but you need to obviously change out the wiring connector.
DUB
thanks DUB
i didn’t see a chart but I also missed the diagnostic on 6e36.
Hello all. I'm new here and have been doing research on the knock sensor issue because my 82 has some timing problems that I have not been able to figure out. I've ruled out IAC, EGR, Vacuum leaks, etc. Idles perfect with the brown/white wire disconnected, but as soon as you connect it the idles goes over 1,000 rpms. As I recalled, GM was a parts bin manufacturer and I found it very odd that it would have a sensor specific to that Corvette. I was able to find a knock sensor catalog at http://www.tomco-inc.com/Catalog/knock%20sensors.pdf, and cross-referenced it to other GM vehicles. The part # in question is 29017. It also goes to an '81 Cutlass with A VIN# as well as several other vehicles as you will see. I found one readily online and have ordered it. I will report once I receive it.
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Originally Posted by 82 White Vette
Hello all. I'm new here and have been doing research on the knock sensor issue because my 82 has some timing problems that I have not been able to figure out. I've ruled out IAC, EGR, Vacuum leaks, etc. Idles perfect with the brown/white wire disconnected, but as soon as you connect it the idles goes over 1,000 rpms. As I recalled, GM was a parts bin manufacturer and I found it very odd that it would have a sensor specific to that Corvette. I was able to find a knock sensor catalog at http://www.tomco-inc.com/Catalog/knock%20sensors.pdf, and cross-referenced it to other GM vehicles. The part # in question is 29017. It also goes to an '81 Cutlass with A VIN# as well as several other vehicles as you will see. I found one readily online and have ordered it. I will report once I receive it.
That's odd. The 82 sensor looks nothing like the that or like the 84 crossfire sensor, but the 84 does look like the above picture here. The wiring for the 82 is not the same as the 84 either including the connector. If you look at the wiring diagram between the two (82/84), they changed pins around. I was going to replace my 82 sensor with an 84 and I have the parts needed, but haven't got under her to see what I need to do to actually replace it including the ESC. It would be a whole lot better going to a newer style vs the one off 82 sensor that is very hard to find and if you do find it, they want way more than it's worth, that's for sure.
Last edited by Buccaneer; Feb 11, 2019 at 03:23 PM.
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Originally Posted by Buccaneer
That's odd. The 82 sensor looks nothing like the that or like the 84 crossfire sensor, but the 84 does look like the above picture here. The wiring for the 82 is not the same as the 84 either including the connector. If you look at the wiring diagram between the two (82/84), they changed pins around. I was going to replace my 82 sensor with an 84 and I have the parts needed, but haven't got under her to see what I need to do to actually replace it including the ESC. It would be a whole lot better going to a newer style vs the one off 82 sensor that is very hard to find and if you do find it, they want way more than it's worth, that's for sure.
Unless my memory is failing me (which is entirely possible) I believe the '82 module internal circuitry (schematic-wise) is just a discrete parts version of the later integrated circuit version used in '84-91(?). And I believe the 82 knock sensor was the same/similar frequency and impedance as the '84+ (L83 and L98) sensors.
I'll try to do some digging around to see if I can find anything to confirm or correct my memory here.
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Originally Posted by 69427
Unless my memory is failing me (which is entirely possible) I believe the '82 module internal circuitry (schematic-wise) is just a discrete parts version of the later integrated circuit version used in '84-91(?). And I believe the 82 knock sensor was the same/similar frequency and impedance as the '84+ (L83 and L98) sensors.
I'll try to do some digging around to see if I can find anything to confirm or correct my memory here.
The 82 has a different filtering in ESC for the sensor, but working on digging all the info I need to make the conversion and then share it. It also has a shield wire on 82.
Last edited by Buccaneer; Feb 12, 2019 at 12:22 AM.
I would think that as long as the thread and frequency of the sensor are the same, the electrical connection can be modified to fit the sensor. I'll post a picture when I get it. I got notification that it shipped yesterday.
Well, after a year of searching, I think I have found a source for the original GM knock sensor (not used, new). I have ordered it and received it. I hope to replace it this weekend and if it works, I will report the results, post pictures and include the link. It was not cheap, that's for sure.
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Originally Posted by Buccaneer
The 82 has a different filtering in ESC for the sensor, but working on digging all the info I need to make the conversion and then share it. It also has a shield wire on 82.
Hey guys. Yes, it worked, and yes, it's the correct one! Where do you all host images? I took plenty of them through the process. Finished it about an hour ago. And yes, it brought my cold idle down to 900rpms down from 1500+.
Last edited by 82 White Vette; Mar 12, 2020 at 08:10 PM.
I think I finally figured out how to upload images. I bought the sensor from Lectric Limited (www.lectriclimited.com). Part #: 01997463 It was not cheap (~$169), however it is a plug and play replacement as you can see from the pictures. One thing I noticed is that when I took the old one off, no coolant came out. I stuck a screwdriver in the hole and cleaned out some crud. It started flowing then (don't know if that would have any impact on the sensor). Anyways, happy with the result.
Thanks for doing the research on this. Since I originally posted this message, my engine failed due to a rounded lobe on the camshaft. So I think my knock sensor was working and I transferred it into the new crate engine. I agree, this should be part of the Sticky for MY 1982. Maybe Steve is reading this.
1982 knock sensor replacement
You should post a "sticky" on that info. Others will surely need it.
Thank you!