Need help swapping series II 3800 into 93 SSE - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-12-2005, 05:33 PM   #1
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Default Need help swapping series II 3800 into 93 SSE

Hi, I'm a bit new to the forums, and I could use a little help. It seems the engine in my 93 SSE is more or less on its way out without being overhauled. I don't really want to do that, but I also don't want to just abandon my car after having it only a little more than a year. I'm looking to swap the series I engine thats in there out for a series II 3800 out of a 97 bonny that I got for $100. What I need is to know is what parts I'm going to need to make this swap work and how much would all of this cost? From what I can tell the engine mounts and transmission should bolt on fine, but what else would need to be done?
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Old 11-12-2005, 05:50 PM   #2
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you are going to need the engine, that you have, the wireharness for the engine, and the PCM.. you should be ok with the trans since you have the 60-e and that is what the 97 Series II NA used...

i would reocmmend that you get both factory Service manuals for the 93 and the 97.... you also may need things like the sender for hte fuel gague as it is different than your 93 and cause different readings....

its not a easy swap, but doable with some time and if your good with electronics
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Old 11-12-2005, 06:18 PM   #3
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Many things have changed and been re-designed over the years in the 4t60, so I do not think a 97 pcm will work.
This is a little more complecated than it might seem... but not impossible.
I know that the L36 and L27 harnesses are almost the same, so you may want to just keep your pcm and harness in the car and use that. Especially since you know your pcm will control your current trans. The L36 has 2 knock sensors instead of one like you L27 so, just connect the rear bank sensor and leave the front screwed in. There also might be some difference in length/connectors so you might need to do some cutting and soldering.
Also, my custom chip is based off an L27 program, so you could contact www.gmtuners.com and get a L36 program burned on your chip for a little over $40.
And make sure you keep that torque-axis mount on the 97 L36 since thats the mount you'll use. ]
Another thing that I'm not sure about is if the rear manifold will bolt up to the DP. It might but I'm thinking it probably won't.
Thats all I can think of right now. It'* a shame your not a 94, that OBD1 pcm supported the 4t60/L36 bonnie in 95.(I think the trannys were the same in 94-95 too).
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Old 11-12-2005, 08:28 PM   #4
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94 and 95 PCM from either a 3800 series I or series II will work fine with your car. You have to change the EPROM from the ECM. Its just cheaper to buy a 95+ bonneville with a series II 3800 already in it. Bonneville prices have come down alot within the last year, don't know why! I paid $1000.00 for my Supercharged SLE 2 months ago, but it didn't run worth **** when I got it. The ECM fixed its problems.
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Old 11-13-2005, 04:04 PM   #5
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Any ideas on how much it should run me total to have someone else do all this for me? I'm not really able to do this myself, but I'd like to know if its going to end up costing me more than its going to for me to get another car.

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Its just cheaper to buy a 95+ bonneville with a series II 3800 already in it. Bonneville prices have come down alot within the last year, don't know why! I paid $1000.00 for my Supercharged SLE 2 months ago, but it didn't run worth ***^ when I got it. The ECM fixed its problems.
I've been looking for another Bonneville already, but there don't seem to be many in my area in my price range. The best looking ones I can find in my price range all seem to be a bit too far away.
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Old 11-13-2005, 08:49 PM   #6
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Easily a motor install can run anywhere from $450.00 to $700.00 depending on the shop that is installing the motor. Your talking about dropping a series II engine into a 93 model Bonneville. There is alot that changed between the years of these vehicles. The wiring harness is different in a 95 Bonneville, and the same applies to the tranny and all the electronics in the vehicle. A good used 3800 series II engine can run anywhere from $250.00 to $1000.00 depending on the mileage and condition of the engine. So to answer your question its more cost effective to buy a newer bonneville with the series II engine in it, then to drop a series II engine into your existing 93 Bonneivlle.
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Old 11-13-2005, 11:26 PM   #7
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stupid question but....why not just replace with a Series One????
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Old 11-14-2005, 01:45 AM   #8
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Quote:
Originally Posted by 1993 SLE
stupid question but....why not just replace with a Series One????
Because I managed to get a series II for $100 and I its going to be more expensive for me to find a series one to replace mine. Maybe I'm stupid for trying to make it work, but it seemed like a good idea at the time. Plus I just like the idea of adding a bit more horsepower to my car.

EDIT: I guess I'll be replacing it with a series one anyway. I may have found a series one engine with only 10,000 miles on and its just going to be a lot less of a pain all around.
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