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2G MD304933 knock sensor will work with a 2g GST?

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patman

5+ Year Contributor
78
38
Oct 19, 2017
Budapest, Europe
Hi guys!

I recently found out that my knock sensor is bad, and I want to replace it.

I started looking for a replacement part, and I was so happy I found one at a local shop, so I immediately bought it. I later found out that it is a replacement for the MD304933 knock sensor which is the 3G 2.4L knock sensor. Will it work with my 4G63 GS-t? Or I will have to look further for the OEM MD300670 replacement?

Thank you for the help!
 
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Will it work with my 4G63 GS-t? Or I will have to look further for the OEM MD300670 replacement?

Here is how you can find the Standard Motor Products KS32 listed for your car on Rock Auto.
It's on this page for your car, along with some other choices that are probably not as good. When you pick the "Info" button you will see "OEM / Interchange Numbers: MD300670" and some more info.



Then scroll up the page to a 3rd gen year, like 2002, and see if the knock sensor part numbers there are the same, or different than they are for 1997. They are different.
So I wouldn't mess around with trying to use that 3rd gen sensor.
 
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Thank you for the help!

The actual sensor that I have is this:

At the 'used in' part it writes its compatible with 2g (and also with many other cars), but the OEM part number is MD304933, so that's why it's confusing
 
At the 'used in' part it writes its compatible with 2g (and also with many other cars), but the OEM part number is MD304933, so that's why it's confusing

Yeah that's confusing.
It could be just plain wrong or it might be some minor difference like the wire length or whether it has a clip or not. How would anybody know, that's the trouble.
What if you installed it and the engine ran ok and didn't give you a check engine light. Does that mean it's ok? I don't think so. The ECU might not know. That's why I wouldn't want to use a knock sensor that I'm not reasonably sure about.
 
I ordered the MD300670, but I had the time today so I installed it, and logged 4-5 pulls, for future reference if anyone needs it. It really has a different sensitivity or frequency.

The knock number is everywhere between 0-10 on pulls, thus the timing is all over the place too. As a result, the car runs very lean, even when on pulls, the AFR is maxed out at lean mixture.

So i quickly got home, reinstalled the old one, I added some duct tape to it, but I will go limp mode until the OEM arrives, I am not confident with this sensor.
 
You'll want to use an Evo 8 knock sensor for a 2g turbo, they are compatible.
Jason, I'm not saying that's wrong but I've seen equal amounts of confirmation about using an 8 sensor in a 2G and working as well as those that said it didn't work, and by work I mean wrong frequency ranges, extra phantom knock, missing real pinging etc.

Is there a credible source which proves the evo 8 sensor does in fact read as accurately as our stock sensors in ECMlink for example?
 
The SMP sensor is made here in our city and I happen to know the engineer that heads the department. I would trust the sensitivity of their products without issue. I talked to him about the KS28 1g sensors and he informed me they outsourced it to the Philippines or something like that. They don't make them anymore but they do still make the KS32 2g sensors, thank goodness.
 
Jason, I'm not saying that's wrong but I've seen equal amounts of confirmation about using an 8 sensor in a 2G and working as well as those that said it didn't work, and by work I mean wrong frequency ranges, extra phantom knock, missing real pinging etc.

Is there a credible source which proves the evo 8 sensor does in fact read as accurately as our stock sensors in ECMlink for example?
I believe it was Kevin Jewer who shared this info, about as credible as it gets.
 
That's my tuner. I trust his opinions. I am using a SMP KS28 in my 1g and it works fine. It picks up knock and phantom knock, I can attest and since I personally know the engineer at SMP for the knock sensors, I trust their product to replicate the OEM sensors.
Thanks Gustav! He is the engineer at SMP.
 
The knock number is everywhere between 0-10 on pulls, thus the timing is all over the place too. As a result, the car runs very lean, even when on pulls, the AFR is maxed out at lean mixture.

That's interesting info, thanks.
When you say knock number, do you mean like what people used to talk about "knock counts" or do you mean degrees of ignition timing retarded from the normal? In your Specs and Mods it just says "Custom Eprom Ecu" with no further information, so I don't know what kind of number it is giving you for the "knock number".
 
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