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Old 09-09-2010, 04:51 PM   #1
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Default put 2005 GrandPrix 3800 Series3 into a 1997 Lesabre

Will a put 2005 GrandPrix 3800 Series3 into a 1997 Lesabre (series2 3800) neither are supercharged.

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Old 09-09-2010, 05:45 PM   #2
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First off welcome to the GMForum and i don't understand your question.Are you asking if its is possible to replace a s2 with an s3?Of course anything is possible will it be easy NO it would mean all new computer/wiring harness/pin switching ect ect.It would be much easier to replace it with a s2
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Old 09-09-2010, 06:12 PM   #3
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First off welcome to the GMForum and i don't understand your question.Are you asking if its is possible to replace a s2 with an s3?Of course anything is possible will it be easy NO it would mean all new computer/wiring harness/pin switching ect ect.It would be much easier to replace it with a s2
Not sure that you are thinking along the right line. Replacing a S2 with a S3 is a lot easier than a S1 to S2 upgrade. Main things that would need changed for it to work in a S2 car: Replace the returnless fuel system with either fuel logs for S2 or use S2 fuel rail (not 100% sure on fitment there), change the throttle body out because the S3 uses drive-by-wire, some modifications to the wire harness, and a tune (possible computer swap but I do believe timing and other things are the same between S2 and S3, once again I'd wait for another member to chime in on that). Those are the main points I can think of right now. Don't have personal experience with the S3 but I have researched a lot on it before.
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Old 09-09-2010, 06:59 PM   #4
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Welcome to the forum YGDUDE.. If u dont mind, post a introduction of yourself in the Introduction To New Members section
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Old 09-09-2010, 10:35 PM   #5
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Whoops sorry Brian you are right i got the two backwards my aplogies i hope i didn't start you in the wrong direction.I was wrong i was thinking s1 to s2 i aplogize
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Old 09-10-2010, 07:59 AM   #6
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Did this again the other night. It'* a very easy swap. The block, heads, LIM etc are all externally the same and the internals are a little better.

To make this as easy as possible, here'* how you do it.
Swap the UIM over (the metal one would require a $75 TB adapter)
Swap the rear exhaust manifold (all the others are fine to keep)
Swap the oil pan and pick up tube.
Swap the oil filter adapter

That'* all there is to it. A mechanic buddy of mine called and asked about L36 motors and I let him know that most L26'* were going for less money with many less miles. At $300 he got a 60K motor and is a happy guy.
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Old 09-10-2010, 10:48 AM   #7
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What about the fuel system Bill? The S3 has a returnless fuel system while our cars have a return line.
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Old 09-10-2010, 12:01 PM   #8
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Originally Posted by BillBoost37 View Post
Did this again the other night. It'* a very easy swap. The block, heads, LIM etc are all externally the same and the internals are a little better.

To make this as easy as possible, here'* how you do it.
Swap the UIM over (the metal one would require a $75 TB adapter)
Swap the rear exhaust manifold (all the others are fine to keep)
Swap the oil pan and pick up tube.
Swap the oil filter adapter

That'* all there is to it. A mechanic buddy of mine called and asked about L36 motors and I let him know that most L26'* were going for less money with many less miles. At $300 he got a 60K motor and is a happy guy.
IIRC Andy was able to get away with just swapping the oil filter adapter, not the pan too.
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Old 09-10-2010, 12:12 PM   #9
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Maybe? I'm not positive ... I went with what I knew would be 100%
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