performance &brainstroming - 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 07-23-2007, 12:05 PM   #1
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I just installed a 1992 3800 engine in a 1995 Pontiac Bonneville. I 'm running into a problem with the wiring harness...more or less which one to use or am I in over my head in the wrong direction. Any help with this haywire problem would be greatly appreciated! Thanks
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Old 07-23-2007, 12:11 PM   #2
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Oh boy..

first off..please change the title to something a little snazzier like "wiring nightmare" or ..."92 trying to run off 95 wiring"

Then.. holler back and let us know what model you have. There are more differences between models than years..although you did pick a good one.
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Old 07-23-2007, 12:40 PM   #3
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thanks for the quick reply...wow! tThe original donor car was a 1992 bonneville SE with a tuned port fuel injection (grey cast aluniumn intake) 97,000 kms. The car 1995 Pontiac Bonneville SE recieving the Trans Plant was originally equipped with a 3800 ...... (black plastic intake)ser#1G2HX52K6S42xxxxx.I hope this is of some help in answering your question . You probuly know what happened to the origial engine.......antifreeze was involved.........!!Thanks again
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Old 07-23-2007, 01:32 PM   #4
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You picked a less-powerful engine, and your shift points won't be anywhere close to correct if you try to run it off the 95 PCM.

We need alot more details about what you swapped.
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Old 07-23-2007, 01:32 PM   #5
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Oh boy. You're putting a series 1 (L27) into a car that originally had the series II (L36).

I'll let the gearheads tackle this one.

In the mean time, I'll move this to the 92-99 section for you. This is not a performance topic.
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Old 07-23-2007, 02:09 PM   #6
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You'll have many sensors and things that exist in 95 that probably can't work on the 92 engine.. on top of that all..... your 92 engine might not even have an EGR.

Ok.. let'* talk about this systematically. Can you please take pictures and post them here so we can see what is or isn't already where we think it might work.

Thanks
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Old 07-23-2007, 03:28 PM   #7
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I have all the motor wiring harness from the L-27(1992) engine completely hooked to engine back to the firewall. Could I use this harness and tie it the exsiting harness in someway and then change the computer? Going to take some pics !Thanks
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Old 07-23-2007, 03:31 PM   #8
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You would need to confirm the various inputs to each cavity between 92 and 95 on that connector to make it work right, change your interior harness or cut and hack a ton... to get the old pcm in.
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Old 07-23-2007, 03:38 PM   #9
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You will have to cut and splice. The connectors between the 92 and 95 pcm'* are very different.

You will need the factory wiring diagrams for both years to figure it all out.

You have a major mess on your hands that would be better solved by installing the correct engine.
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Old 07-23-2007, 05:57 PM   #10
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im just thinking i don 't know nothing about this but could he install the sensor from the L36 on the L27 an keep the L36 computer
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