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LT Header Guys!!! No more extensions or corvette o2s!

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Old 02-02-2015, 12:13 AM   #101
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I wouldn't think so since the PCM would be different.
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Old 02-02-2015, 08:02 AM   #102
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I think the same principles "may" apply. If you get a wiring schematic for the LT1, all you're doing is swapping the wires the PCM is reading. Just change the wires at the PCM harness so the rear "plugs" are now wired into the front spot of the harness.
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Old 02-02-2015, 01:04 PM   #103
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I'm just curious why this hasn't been stickied yet?
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Old 02-02-2015, 01:28 PM   #104
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Quote:
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I'm just curious why this hasn't been stickied yet?
Good point
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Old 02-11-2015, 05:05 PM   #105
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I haven't gotten long tubes yet, but plan to. I already had my rear O2s deleted in a tune, because my cats were bad. Would this not work for me then?
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Old 02-11-2015, 05:45 PM   #106
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I haven't gotten long tubes yet, but plan to. I already had my rear O2s deleted in a tune, because my cats were bad. Would this not work for me then?
It would be perfect actually. Your PCM has them deleted from the PCM. Has nothing to do with the WIRING and what PORTS you use for the "plug-ins"
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Old 02-12-2015, 07:28 PM   #107
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Bout time this has been stickied..!! I would like to add that anyone who has done this...WRITE IT DOWN!! Don't forget that this was done to the car because if you ever sell it, and the new owner has to swap everything out to pass stupid emissions tests, they will NEVER figure out what the hell is wrong with their car. Believe it or not, I just came across this very problem a few weeks ago.
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Old 09-07-2015, 01:10 PM   #108
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If you are going to do this mod and leave the original front sensor plugs empty (no sensors attached), and are going to run with no cats, you'll need to have these codes deleted:

P0137 HO2S Circuit Low Voltage Bank 1 Sensor 2
P0138 HO2S Circuit High Voltage Bank 1 Sensor 2
P0140 HO2S Circuit Insufficiency Activity Bank 1 Sensor 2
P0141 HO2S Heater Circuit Bank 1 Sensor 2
P0157 HO2S Circuit Low Voltage Bank 2 Sensor 2
P0158 HO2S Circuit High Voltage Bank 2 Sensor 2
P0160 HO2S Circuit Insufficiency Activity Bank 2 Sensor 2
P0161 HO2S Heater Circuit Bank 2 Sensor 2
P0420 Catalyst System Low Efficiency Bank 1
P0430 Catalyst System Low Efficiency Bank 2

The P0420/P0430 are for the front sensors (now using the rear plugs) not reporting an error due to no cats. All the other codes are related to not having rear sensors plugged in since your front plugs have now become your rear plugs and you likely are leaving them empty rather than having sensors dangle from them.

Last edited by CoolAid; 09-07-2015 at 01:41 PM.
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Old 06-25-2016, 11:18 AM   #109
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Just installed headers and did this mod. Excellent write up and BIG thanks. I feel like I owe someone some money.

I will add one thing. When removing the pins, slip small screwdriver under the hook, then tip the pin back, this will immediately release the wire and therefor won't require any "tugging" on the wire.
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Old 11-12-2016, 01:45 PM   #110
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I just want to make sure I'm doing this right. So 25 and 26 switch with each other then 28 and 29 switch we other and the other two do the same right ?
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Old 11-12-2016, 06:41 PM   #111
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Quote:
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I just want to make sure I'm doing this right. So 25 and 26 switch with each other then 28 and 29 switch we other and the other two do the same right ?
That is correct. You have a 1999-2002, right? 1998 is different.
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Old 11-14-2016, 05:00 AM   #112
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That is correct. You have a 1999-2002, right? 1998 is different.
Yes I originally tried this and thought the purple wires just switched with the brown but I put them back and flipped them now I'm
Hoping the light goes off. I did about 15 miles of driving so far.
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Old 03-12-2017, 05:34 PM   #113
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How is everyone doing with this mod? Six years later and my car has no issues or problems what-so-ever.

I'm currently working on this write-up so it will be published on racingjunk.com's "How To" page.

Much thanks for everyone who's given me credit and feedback. I'm glad this mod has benefited a lot of people.

If it wasn't for the overwhelming response on here, I would have never changed careers and became a writer. I'm currently a freelance writer for racingjunk.com and pursuing a bachelor's in English/Creative Writing.
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