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Old 03-21-2012, 10:22 PM   #1
jmerk
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Default 99 SL2 Dohc motor change with 98 Dohc donor

Pulling the 99 and have a 98 donor with lower miles to swap. Can I leave the tranny in and pull the 99 out the top for easiest job? Or should i pull motor and trans together? 99 auto isin good shape. TY.......
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Old 03-21-2012, 10:39 PM   #2
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Default Re: 99 SL2 Dohc motor change with 98 Dohc donor

Exhaust is different, otherwise the swap should be straightforward. Engine can come out by itself, or with the trans. Which is easier is a matter of opinion (which sometimes varies on whether it's an auto or manual).
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Old 03-21-2012, 10:53 PM   #3
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Default Re: 99 SL2 Dohc motor change with 98 Dohc donor

If the 99 has AIR injection you will have an issue with that.
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Old 03-21-2012, 10:56 PM   #4
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Default Re: 99 SL2 Dohc motor change with 98 Dohc donor

If they're both automatic, leave the transmissions in place: there is plenty of clearance, and it's obviously easier/faster. I've heard that with manuals, it's more difficult to leave the transmission in place, and as such, most people recommend pulling the manual transmission with the engine (but I don't have any first hand experience with manuals).
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Old 03-21-2012, 11:27 PM   #5
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Default Re: 99 SL2 Dohc motor change with 98 Dohc donor

How do i get around the air injection. Don't suppose i can cap it off????? Doesn't look like there's tooooo much volume in the injection.
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Old 03-21-2012, 11:32 PM   #6
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Default Re: 99 SL2 Dohc motor change with 98 Dohc donor

The 98 has a manual tran and it's already pulled. I have to take the flex plate off but other than that i should be good to go. I'm itching to get this project finished so i can start on my 95 swap from auto to manual......
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Old 03-22-2012, 12:06 AM   #7
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Default Re: 99 SL2 Dohc motor change with 98 Dohc donor

Are you putting the 99 into a 98 or the other way around?
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Old 03-22-2012, 10:12 AM   #8
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Default Re: 99 SL2 Dohc motor change with 98 Dohc donor

Putting a 98 dohc into a 99 dohc. TY......
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Old 03-22-2012, 10:37 AM   #9
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Default Re: 99 SL2 Dohc motor change with 98 Dohc donor

You will have to keep the 99 PCM and if the 99 engine has air injection there is no easy way to shift it over to the 98. So, the first question is this: Does the 99 engine have the AIR system?

The exhaust head pipe has to be changed to a 98 to fit the 98 manifold.
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Old 03-22-2012, 12:16 PM   #10
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Default Re: 99 SL2 Dohc motor change with 98 Dohc donor

What makes the 99 pcm special? Shouldn't any odb2 work?
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Old 03-22-2012, 03:08 PM   #11
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Default Re: 99 SL2 Dohc motor change with 98 Dohc donor

The PCM is generally body specific. Transmission, SDM and cluster are the big ones.

So, does the 99 have the AIR system?
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