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Old 02-24-2007, 06:45 PM   #1
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Default 93 SSE No Boost

I have a 93 Bonneville SSE with Supercharger. Ever since I had baught it about 6 months ago, the boost gauage has never gotten above 0 even at full acceleration. The car runs and drives fine other than it has a loss of power between 1500-2500rpm for the first few minutes when cold.

I just want to figure out why it isn't boosting, I have time to work on it now but have no idea where to start looking.

I have a set of factory service manuals, but sofar haven't found anyhting useful, and did a search on here with no luck.

Any help would be awsome.
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Old 02-24-2007, 08:04 PM   #2
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Check both the boost control solenoid, and the boost control actuator. Also do a search on those terms, or BCA and BCS. I found lots. Here'* one.

http://www.bonnevilleclub.com/forum/...&highlight=bcs
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Old 02-24-2007, 08:08 PM   #3
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check the vaccum lines around the supercharger.

It sounds like a BCS problem to me.
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Old 02-24-2007, 10:08 PM   #4
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I did a little test on it today, could not find any vaccum leaks at all. I had the car started and during idle the bypass valve was fully opened, then I reved the engine up and it fully closed and opened anain during idle. I unplugged the BCS during idle and it let the bypass valve close.

So I am confused, because isn't the bypass valve supposed to be closed during acceleration, which its doing now. I took and unplugged and capped off the vaccum lines for the bypass valve and took the car for a spin, it had -8 on the boost gauge during idle then, but still wouldn't boost past 0 with it unhooked. So I dunno whats wrong, I know zip about supercharged engines, but I figured unhooking the bypass valve would cause it to full boost but I guess not.
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Old 02-24-2007, 10:13 PM   #5
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Heh, seems as if someone removed the coupler before selling it to you. Do us a favor and pull your intake off temporarily and rev it up while under the hood. Any whine?
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Old 02-24-2007, 10:24 PM   #6
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Quote:
Originally Posted by Bonneville94V688
Heh, seems as if someone removed the coupler before selling it to you. Do us a favor and pull your intake off temporarily and rev it up while under the hood. Any whine?
Actually I have never heard the engine whine, when I rev it it sounds just like the N/A cars. I baught the car at a auction with 179K on it and needing some work. But it ran good and sofar over the last 8K I have put on it, has ran flawlessly other than hard starting when its cold out.

I can't tell if anything has been apart before, so what should I look for?

Mike
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Old 02-24-2007, 11:43 PM   #7
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Try removing the belt and give the pulley for the supercharger a spin. Can you feel resistance, or does it spin freely?
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Old 02-25-2007, 09:44 PM   #8
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Any update on this?
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Old 02-25-2007, 11:56 PM   #9
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Quote:
Originally Posted by Bonneville94V688
Heh, seems as if someone removed the coupler before selling it to you. Do us a favor and pull your intake off temporarily and rev it up while under the hood. Any whine?
That'* ridiculous. Even without a coupler, it would clank horribly, and still produce full boost.
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Old 02-26-2007, 12:03 AM   #10
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Really? Had no idea.
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