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PostPosted: Mon Oct 25, 2010 1:11 pm 
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Joined: Mon Oct 25, 2010 1:00 pm
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Year and Trim: 1997 SSE
I have just completed the engine swap, putting a 3800SC from what I believe is a 2000 Grand Prix GTP into my 97 Bonneville SSE which was normally aspirated. Pretty straight swap from the bolt up perspective. Swapping the flywheel was the only change I made to get it bolted up.

The engine is running and it seems close to right, but just not quite. Actually has stalled a couple of times today when stopped and idling after warm up. This is new behavior after driving about 700 miles on this engine.

1) The manual BBV I have left plugged into the solenoid because there is vacuum on the line coming from the manual diaphram. I've seen some posts saying to take that line off the solenoid. I don't have a wire on my harness for that solenoid so I plan to leave it unplugged. Should I be able leave the lines on and leave the solenoid unpowered?

2) After the car is warm at idle the "Check gauges" light (NOT Check Engine) comes on. I see no gauge indication of a problem. I suspect this is related to the alternator change. The alternator with the engine has 3 wires instead of the 2 my old alternator had. I only hooked up one of the signal wires and it seems to read right around 14V on the dash gauge, but does drop down to 13 at times. What should I check? Any suggestions on different wire up for this alternator?

3) Lastly and perhaps most important, I have read the ECM should be reflashed after this swap. Is this needed? What will it do for me? I think the engine is not as smooth at idle as the old one. Would this correct that issue?


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PostPosted: Mon Oct 25, 2010 1:13 pm 
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Location: Browerville, MN
Year and Trim: 2004 GXP - plus a handful of other Bonnevilles
What ECM are you using?

What are the CEL codes?

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PostPosted: Mon Oct 25, 2010 7:31 pm 
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Joined: Mon Oct 25, 2010 1:00 pm
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Year and Trim: 1997 SSE
This is my first trip down the 3800 swap lane so I don't know that I can answer your question with the detail that you require. I have kept the PCM that was in the 1997 normally aspirated car.

The CEL is off an there are currently no codes that I can find with a simple pocket scanner.

How can I get a more thorough answer for you?


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PostPosted: Mon Oct 25, 2010 7:47 pm 
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Joined: Mon May 19, 2008 6:04 pm
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Location: Browerville, MN
Year and Trim: 2004 GXP - plus a handful of other Bonnevilles
You absolutely need to be running the supercharged PCM and wiring harness. I am stunned you have it running right now.

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2002 Ram 1500 Quad Cab Sport | Black| 190k | Official Bonneville Hauler


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PostPosted: Mon Oct 25, 2010 9:27 pm 
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Location: Corning, NY
Year and Trim: 2012 Eco
Seconded. Get the supercharged PCM in there ASAP. It has the right tables to run your engine.

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PostPosted: Mon Oct 25, 2010 9:28 pm 
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Location: Oregon WCBF'04, '05, '06, '07, '08, '09, '10, '11 Survivor
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Ungodly. Your MAF and fueling curves have to be WAY off. To the point of running dangerous piston-popping lean at anything above half throttle.

Get that setup right first. Don't drive the car.

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