LT1-LT4 Modifications 1993-97 Gen II Small Block V8

24x PCM Questions

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Old Apr 16, 2013 | 09:19 AM
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Hey anyone on here done a 24x swap on there LT1 or are familiar with it? I just frantically cancelled my order for my 97 Camaro because I cant switch the VIN over from my car to my PCM. I wont be able to just swap PCMs for emissions because of the different harnesses. Does MVD look at the VIN when they plug into the car? How is everyone doing this, Im thinking the VINs would have to match.

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Old Apr 16, 2013 | 09:47 AM
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No, they don't look at the VIN on the PCM. Besides, when your new PCM is programmed, it will have your VIN in it anyway. The tuner will put your VIN in it to identify the vehicle.
As long as your car passes smog, they can't say anything, even if you had a Falconer V-12 in it or an old flathead ford in it.
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Old Apr 16, 2013 | 10:33 AM
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Originally Posted by SAPPER
The tuner will put your VIN in it to identify the vehicle.
I *think* EFILive (and HP Tuners) will not allow the LT1 VIN in the LS1 PCM. I seem to remember there being a criteria mismatch.
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Old Apr 16, 2013 | 10:35 AM
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I did a quick Google search after I had ordered it and read that you can't change the vin on the pcms. Is this false?
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Old Apr 16, 2013 | 10:58 AM
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Originally Posted by S10Wildside
I *think* EFILive (and HP Tuners) will not allow the LT1 VIN in the LS1 PCM. I seem to remember there being a criteria mismatch.
Possibly. That might be why my tuner said he'd do a Custom OS on mine.

But I still don't understand your dilemma. The DMV has no control over your PCM.
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Old Apr 16, 2013 | 04:44 PM
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Originally Posted by SAPPER
No, they don't look at the VIN on the PCM. Besides, when your new PCM is programmed, it will have your VIN in it anyway. The tuner will put your VIN in it to identify the vehicle.
As long as your car passes smog, they can't say anything, even if you had a Falconer V-12 in it or an old flathead ford in it.

Many emissions states allow only newer engine swaps of similar emissions classification of vehicle and then the tailpipe test would have to match the swapped engine.
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Old Apr 16, 2013 | 09:37 PM
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No sniffer test for my car, they just plug it into the obd2 port and if there is no codes and the readiness (o2 etc) checks out then you pass. Im more worried about them plugging in their scanner and saying hey this vin on your computer doesnt match the cars. thats even if they can see the vin or not. it is a dillema when im going to pay 2k for something that im scared mvd wont like.
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Old Apr 17, 2013 | 07:25 AM
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No, don't worry about that. I'm not real sure about the Snap-on tools but as far as I know, the only scanner that can read the VIN is the Tech 2 (GM's tool).
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Old Apr 17, 2013 | 07:33 AM
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What will they do if your vin won't match?? Fail you for that??
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Old Apr 17, 2013 | 12:51 PM
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I am going through with the swap. I have a plan, and a backup plan as far as emissions go. Operation Smart Brain is a go.
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Old Apr 17, 2013 | 10:26 PM
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you'll be fine
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Old Apr 17, 2013 | 11:58 PM
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As stated you will need to find a tuner with efi live. That's the only software that will allow you to change vins.
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Old Apr 19, 2013 | 01:01 AM
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I ordered the 24x swap from EFI yesterday. Also got my harness, coils, and brackets ordered from BP Automotive. Im getting a little excited now.
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