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Old 02-25-2011, 10:30 PM   #1
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Default Can an LS1 swap into an LT1 car pass OBDII emissions???

I was about to apply for my "race car exemption" from Illinois, and noticed all the threads about LS1's being reprogrammed to pass when they posisbly shouldn't be. Got me wondering how much effort it would take to get an LS1 swapped into an LT1 car to pass??? It is a newer cleaner motor in an older car, and is a few cubes smaller. Which I believe they say is allowable for a motor swap here in IL. Just not sure if the OBDII scan would throw up any flags if programmed to pass?

I do have Speed Inc locally that I could have look at the car for me if needed. Just wondering on the feasibility of this before I bother anyone over there. Figure someone here has to have done it before.
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Old 02-26-2011, 01:18 AM   #2
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Here in NC, you either have to swap the motor with the same year or newer or it has to be newer than the previous motor, I can't remember.
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Old 02-26-2011, 07:48 AM   #3
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Here in NC, you either have to swap the motor with the same year or newer or it has to be newer than the previous motor, I can't remember.
Same here in TX
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Old 02-26-2011, 10:44 PM   #4
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There are laws regulating engine swaps? Who the **** is gonna be smart enough to know the difference? They work for the state!!
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Old 02-26-2011, 11:40 PM   #5
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I don't see why it would be an issue, honestly when you swap the LS1 in, you will need the LS1 harness, therefore all the functioning systems from the LS1 pcm will show on the OBD2 scan and it won't say this is not and LT1 harness the OBD2 should just pick up whether certain systems are pass or fail. If they are tuned out it will show as a pass, if they are not tuned out but all sensors are good and plugged in then it will show as a pass.

Then again I could be wrong.
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Old 02-26-2011, 11:53 PM   #6
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I don't see why it wouldn't pass. You could just tune everything out.
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Old 02-28-2011, 09:36 AM   #7
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Most state end federal laws require same year or new engine for a replacement. As long as you can get all of the systems working correctly and all SES lights off and self test to run and comeback as complete then you should be able to pass.
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Old 02-28-2011, 02:35 PM   #8
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If you make it look like a stock install the tech will more than likely (99%) not know there has been a swap. The only thing I can think of is if they plug in an obdI and it doesn't read anything since it will now be OBDII...
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Old 02-28-2011, 04:01 PM   #9
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well in my strict state of taxachusetts when it comes to engines as long as you don't throw a code you pass. I ditched the dual cat set up for a less restrictive single cat set up, ditched the AIR & EGR and have never had a problem cause its all tuned out of the pcm

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If you make it look like a stock install the tech will more than likely (99%) not know there has been a swap. The only thing I can think of is if they plug in an obdI and it doesn't read anything since it will now be OBDII...
as far as I know they can't plug into an OBDI vehicle. we used to have rollers with a sniffer for '95 and earlier vehicles which the state did away with 2? years ago for cost reasons(those systems always had problems too). now they don't bother checking emissions for OBDI vehicles.
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Obviously, somethings not right there. Is the supercharger set to suck instead of blow?

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Old 02-28-2011, 04:05 PM   #10
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Yes it can pass. Buddy did an LS1 swap with his 97 and passes.
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Old 02-28-2011, 04:34 PM   #11
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Have a friend that can pass you.
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Old 02-28-2011, 04:34 PM
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