LS2 w/"243" ECM - Knock Sensor Question
LS2 w/"243" ECM - Knock Sensor Question I have a 24x LS2 from an '06 GTO with an E40 PCM. I'm nearly 100% certain (based on research) that if desired, this engine can be operated DBW with the stock LS2 90mm TB using:
- 2003+ "truck" 12586243 blue/green ECM flashed to 2004 Corvette OS
- 2004 C5 TAC
- 2004 C5 Gas pedal
Assuming the above is correct, does this setup require LS1 type knock sensors to be installed externally? Or can the stock LS2 knock sensors be retained?
TIA.
Tipsy
- 2003+ "truck" 12586243 blue/green ECM flashed to 2004 Corvette OS
- 2004 C5 TAC
- 2004 C5 Gas pedal
Assuming the above is correct, does this setup require LS1 type knock sensors to be installed externally? Or can the stock LS2 knock sensors be retained?
TIA.
Tipsy
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The 2006 GTO uses the external knock sensors that bolt to the outside of the block just behind the motor mount brackets. Did you get the engine wiring harness?
If you use the external knock sensors, you don't have to change out your valley cover to the LS1 style.
If you use the external knock sensors, you don't have to change out your valley cover to the LS1 style.
This post implies that the stock LS2 knock senors can be retained if a 12586243 blue/green ECM is used. That's the only reference I have seen that suggests that stock LS2 knock sensors can be used with a LS1 type ECM, so I'm trying to verify whether that information is accurate.
Tipsy
Last edited by TipsyMcStagger; Mar 5, 2015 at 05:29 PM.
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While I do not have the answer (and am exploring this issue myself), here are some threads on the subject of using LS2 sensors with an LS1 (411) PCM:
https://ls1tech.com/forums/pcm-diagn...w-ls1-pcm.html
https://ls1tech.com/forums/pcm-diagn...ensitiviy.html
https://ls1tech.com/forums/pcm-diagn...-computer.html
https://ls1tech.com/forums/pcm-diagn...-01-5-7-a.html
http://www.hptuners.com/forum/showth...a-Ls1-Pcm-!-!-
Correct me if I am wrong, but my summary of those threads is:
1. LS2 knock sensors can be used with '99-'02 PCMs
2. It requires a special wiring harness
3. The wiring harness needs to be pinned into the PCM differently than LS1 sensors
4. EFI Live has the ability to select the knock sensor type
5. The sensitivity is adjusted a bit.
As far as I can tell, HP Tuners does not have the ability to select knock sensor type.
Edit: Correction - HPT 2.24.1064 finally allows selecting the know sensor type.
https://ls1tech.com/forums/pcm-diagn...w-ls1-pcm.html
https://ls1tech.com/forums/pcm-diagn...ensitiviy.html
https://ls1tech.com/forums/pcm-diagn...-computer.html
https://ls1tech.com/forums/pcm-diagn...-01-5-7-a.html
http://www.hptuners.com/forum/showth...a-Ls1-Pcm-!-!-
Correct me if I am wrong, but my summary of those threads is:
1. LS2 knock sensors can be used with '99-'02 PCMs
2. It requires a special wiring harness
3. The wiring harness needs to be pinned into the PCM differently than LS1 sensors
4. EFI Live has the ability to select the knock sensor type
5. The sensitivity is adjusted a bit.
As far as I can tell, HP Tuners does not have the ability to select knock sensor type.
Edit: Correction - HPT 2.24.1064 finally allows selecting the know sensor type.
Last edited by mrvedit; Mar 6, 2015 at 08:39 PM.
While I do not have the answer (and am exploring this issue myself), here are some threads on the subject of using LS2 sensors with an LS1 (411) PCM:
https://ls1tech.com/forums/pcm-diagn...w-ls1-pcm.html
https://ls1tech.com/forums/pcm-diagn...ensitiviy.html
https://ls1tech.com/forums/pcm-diagn...-computer.html
https://ls1tech.com/forums/pcm-diagn...-01-5-7-a.html
http://www.hptuners.com/forum/showth...a-Ls1-Pcm-!-!-
Correct me if I am wrong, but my summary of those threads is:
1. LS2 knock sensors can be used with '99-'02 PCMs
2. It requires a special wiring harness
3. The wiring harness needs to be pinned into the PCM differently than LS1 sensors
4. EFI Live has the ability to select the knock sensor type
5. The sensitivity is adjusted a bit.
As far as I can tell, HP Tuners does not have the ability to select knock sensor type.
https://ls1tech.com/forums/pcm-diagn...w-ls1-pcm.html
https://ls1tech.com/forums/pcm-diagn...ensitiviy.html
https://ls1tech.com/forums/pcm-diagn...-computer.html
https://ls1tech.com/forums/pcm-diagn...-01-5-7-a.html
http://www.hptuners.com/forum/showth...a-Ls1-Pcm-!-!-
Correct me if I am wrong, but my summary of those threads is:
1. LS2 knock sensors can be used with '99-'02 PCMs
2. It requires a special wiring harness
3. The wiring harness needs to be pinned into the PCM differently than LS1 sensors
4. EFI Live has the ability to select the knock sensor type
5. The sensitivity is adjusted a bit.
As far as I can tell, HP Tuners does not have the ability to select knock sensor type.
In 98-00 f bodys the tables are not there, in 01 & 02 they are.
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Verdad Gallardo Moderator
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Maybe its just me, but one of my headers doesn't leave room for an LS1 knock sensor sticking out from the block. I therefore tapped an available hole in my oil pan for one knock sensor, but I don't know if that would even work.
There are 100+ previous threads on the subject of LS1 versus LS2/LS3 knock sensors and I am hoping this thread can lead to definitive answers. It seems close already.
There are 100+ previous threads on the subject of LS1 versus LS2/LS3 knock sensors and I am hoping this thread can lead to definitive answers. It seems close already.
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Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Are you saying I have the tables but HPT cannot change them? Only EFI Live?
I opened stock tunes from a few other years and never saw the Knock Sensor options in post #6.
Edit: HPT 2.24.1064 does finally allow selecting the know sensor type.
Last edited by mrvedit; Mar 6, 2015 at 08:39 PM.
If the table is there in HPT then you can edit it. I just looked back at all the ones I done on my personal cars and I used the 2002 12212156 OS on all of them. That OS EFI & HPT has the table to edit the knock sensor type.
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From: Ann Arbor, MI
Not to hijack this thread, but I still cannot find the knock sensor config option.
I have HPT 2.24.152
The loaded tune shows OS 12212156 (Under Edit->Calibration details)
I have Edit-View set to "Advanced".
Edit: Correction - HPT 2.24.1064 does finally allow selecting the know sensor type.
I have HPT 2.24.152
The loaded tune shows OS 12212156 (Under Edit->Calibration details)
I have Edit-View set to "Advanced".
Edit: Correction - HPT 2.24.1064 does finally allow selecting the know sensor type.
Last edited by mrvedit; Mar 6, 2015 at 08:41 PM.
Okay, obviously some very knowledge contributors to this thread. But I'm just a little bit lost. For the sake of clarity, can we detail (1) what components (TAC AND pedal), (2) computer model number(s) and (3) OS flash are required to operate a stock LS2 (DBW) with a LS1 type computer while retaining LS2 knock senors?
TIA.
Tipsy
TIA.
Tipsy
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From: Ann Arbor, MI