SC Engine Swap - Page 2 - 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 04-12-2008, 08:30 PM   #11
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WAIT. I suggested a S1 L67 pump. Not a two-stage, but if the PCM is looking for a two-stage, that won't work. I suggested the S1 L67 pump for the purpose of easy install and better flow than the S2. It MUST be an L67 pump of one sort or another.

A 97 PCM? Can it control a 4T60E? That'* the trans he has out of a 96 SSEi.
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Old 04-12-2008, 08:42 PM   #12
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I didn't get far along enough in my testing to fully verify the trans issues. I was able to hit all four gears with my setup, TCC lockup I was in the process of working on, and it would work on certain tunes. But I DO know the PCMs are the same for 96 and 97. What'* different is the OS in them.


As far as the fuel pump, the 96 or 97 PCM will activate the fuel pump relay, regardless of whether or not its a single or dual stage. The PCM will send, or try to send, the PWM signal to the non-existant fuel pump control module, which would normally command the dual stage pump to go all-out when needed. Just pinch off the PWM and have that DTC deleted...problem solved.
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Old 04-12-2008, 09:30 PM   #13
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I suppose it is a good thing I am an Electronics Engineering Major, I'm quite handy with a soldering iron. Also, I have installed a electronic engine in an old truck and had to do some wiring mods to disable the VATS, I'm assuming it would be about the same.
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Old 04-12-2008, 09:35 PM   #14
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Disabling VATS with the PCMs 96-up models use is in programming only, no work-arounds at all. Sorry to say
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Old 04-12-2008, 09:48 PM   #15
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Does it use more than just the "chip" in the key for vats?

I was just talking to the guy I got the car from, and apparently the engine and trans are from a '95 Olds 98 Touring Sedan. And I was wrong, the donor is a '95 Bonny. Will this throw any wrenches in the gears? I would assume not, or not much, since it was already swapped into a Bonny.

He said the guy that did it for him changed a chip in the computer and that was it. Is this correct.

I hope this don't effect much.
But it don't matter, I'm still gonna do it, lol.
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Old 04-12-2008, 11:24 PM   #16
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that is correct, if the donor trans, eng, and ecu are all 95, then you will just plug and play. the prom will take care of the tuning, and will fit in your existing pcm.
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Old 04-13-2008, 12:01 AM   #17
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You need the Eprom out of the PCM.
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Old 04-13-2008, 07:11 AM   #18
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You will also need the the harness that goes from the PCM to the firewall connector. IIRC, the pinouts between supercharged and non-supercharged changed quite a bit. This also facilitates the addition of the boost control solenoid...the wiring for which the 95 simply won't have.

There will be a MAP sensor on the L67 engine that will not be used at all for your application, as it was used solely for the boost gage in the instrument cluster. Since you have no boost gage, this will not be needed.

The starting point I suggest for you is to look at the 1995 wiring diagrams and, especially, the pinouts for the PCM to see what changed between supercharged and non-supercharged. I am sure you will find a great deal.
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