Engine swap question - 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 03-17-2012, 10:30 AM   #1
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Im not sure if there is a website or other on this but will a 1998 Lasabre 3.8 work in a 1996 Bonneville???? If not what is compatible???
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Old 03-17-2012, 11:55 AM   #2
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The engine itself will fit no problem. Some brackets may need to be swapped along with some of the sensors. Sensors changed part #'* between the different years. But, to be safe, swap them all over and you will be fine.
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Old 03-17-2012, 07:18 PM   #3
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Well thats good news but instead of changing all the sensors wouldnt it be easier to just replace to computer to a 98 Lesabre????
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Old 03-17-2012, 07:32 PM   #4
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No, the Bville PCMs are different. I should know. I have a 96 supercharged Buick PCM in my 97 Bonneville. It'* not compatible with the sending unit, EVAP etc. But thats a different project i'm working on.(have to wait on HP tuners for an update for my current 97 PCM)

While the engine is out, it will only take 10 minutes to swap out all the sensors. LEAVE THE OIL PRESSURE SENSOR UNTIL AFTER THE ENGINE IS IN. I can't count the number of times I have broken that thing by putting the engine back in.

Believe me, less headache afterwards.
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Old 03-17-2012, 08:17 PM   #5
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Oh ok, i see what your sayin.... That makes sense...
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Old 04-12-2012, 08:53 PM   #6
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Well new motor is in and it runs great. Its a 98 Grand Prix supercharged with only 80K. The previous owner spend some cash on the */C and it shows. Lots of power. Before the motor went in i looked at the guts of it and it was very well cared for. Right now im just waiting for the new exhaust since my factory one is not flowing very good. Once it get it breathing better im sure ill be happier than i am now....
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Old 04-12-2012, 10:06 PM   #7
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Is your original trans still in it?
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Old 07-25-2012, 07:33 PM   #8
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Well i just hit the 5k mile mark on my car with the engine transplant and ill say that its run like a top... No issues at all........ Love this car....
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Old 07-25-2012, 10:08 PM   #9
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Gives you a whole new perspective of the car now doesn't it? Same thing happened to me when I upgraded my L36 to L67.
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Old 09-08-2012, 05:40 PM   #10
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Well i just pulled the blown engine apart a found the issue. it was a broken valve spring. 2 thumbs up to GM for the 3.8, everything looked good. The main bearing show some wear but otherwise there was little sign of wear on the rest of the engine.... For a motor with 175K on it it looked good......
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