Bad Supercharger?!? (Update: No, just bad BCS) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-31-2004, 12:06 PM   #1
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Default Bad Supercharger?!? (Update: No, just bad BCS)

Ok... for anyone just joining us please read:
http://www.bonnevilleclub.com/forum/...ic.php?t=16168

Just had my 97 checked out by my mechanic.
We hooked up another gauge to her and measured the boost, 3psi. :(
He checked the vaccum lines no leaks.
Car isn't throwing any codes either.
Only problem is the belt tensioner, it'* sticking. It'll need to be replaced, but it'* still keeping plenty of tension on the belt. We did two test runs, before & after messing w/ the belt tensioner, no difference. Checked the air intake and filter, no problems.
Mechanic suspects it'* a problem w/ the supercharger. Problem is no one around here works on them. Would have to send it to T.O. for repairs. He'* going to do some more research to see what'* going on.

<panic mode = on>

I was wondernig if you guys had any ideas of what might be going on or what to check.
If it is a bad SC.... what'* the worest that could happen? If the SC dies, could it take my engine w/ it too?

How common is it for a SC to die like this?

Is it possible to convert the car to a NA (temporary) if I have to send my SC away?
(Probably easier to dig my 91 out from the snow, but I dunno)

Anyone know the cost of the unit from GM?

Any input would be helpful. My mechanic suggestted that if it costs almost as much to repair the SC as a new one to just buy a M112 (which would be nice)
Any thoughts?

<panic mode = ... still very worried>

Thanks
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Old 03-31-2004, 12:47 PM   #2
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Your car will run fine without a supercharger. In fact you can pull your SC belt off and drive it normally (although slower). If your supercharger is indead bad, you can get it replaced for a farilyl low fee < 300.00 or so. Let me know if you find it is bad and I can get you hooked up with Ed Morad. He is a MAJOR parts supplier (out of his home) for our engines and is a great guy.

The superchargers themselves are pretty robust though not a whole lot to them. Other things to check would be the Boost bypass valve, or the boost control solenoid. The car could just be dumping boost (either by fault, or for a reason) You may want to scan the car for KR?
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Old 03-31-2004, 12:50 PM   #3
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Default Re: Bad Supercharger?!?

Quote:
Originally Posted by Merlin 91/97
Any input would be helpful. My mechanic suggestted that if it costs almost as much to repair the SC as a new one to just buy a M112 (which would be nice)
Any thoughts?
It would cost a lot more to put an MP112 on your car. You would need an intercooler and probably a fair amount of supporting mods as well (exhaust, valvetrain upgrdaes, etc..) And your tranny would probaly not last very long either.
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Old 03-31-2004, 01:13 PM   #4
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Im thinking because your not hearing any noise from the sc (but getting 3 psi), that the sc is working but bypassing instead.
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Old 03-31-2004, 01:16 PM   #5
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Quote:
Originally Posted by Rogue
Other things to check would be the Boost bypass valve, or the boost control solenoid. The car could just be dumping boost (either by fault, or for a reason) You may want to scan the car for KR?
How would I check for the boost bypass valve?
Or the boost control solenoid (isn't this on/off)?
How do I scan for KR?

Sorry guys but I'm not a gearhead....
Can I do any of the 3 above w/o bringing it into the shop?
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Old 03-31-2004, 06:09 PM   #6
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i had a very similar problem to you, heck almost to the tee, i was gettin low boost reading, my problem was the boost control sylenoid, as soon as i replaced it the boost went back up to normal. You can easily replace it yourself. My car is a series one, but on mine the boost control sylenoid is a little black box infront of the wastegate actuator. It has two vaccum lines commin out of it and its pluged into the wire harness. I might need to find a picture....
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Old 03-31-2004, 06:54 PM   #7
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jgs11.... how do you check to see if the BCS is working or not?
Just go and buy another one?

How much are they?


Also... fyi.... I found a place online that sells refurb Eaton SuperChargers for under $1000 USD and they come w/ a LIFETIME warranty.

http://www.superchargersonline.com/

They're so cheap... I might pickup two.... one for the 97 and one for the 97.
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Old 03-31-2004, 06:59 PM   #8
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I think theyre like $14 from www.gmpartsdirect.com
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Old 03-31-2004, 07:02 PM   #9
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First though you want to do the boost bypass. If you do this and the boost goes back up to where it should be then its the boost bypass sylenoid thats bad. You should be able to go up to the search and find the topic.
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Old 03-31-2004, 07:03 PM   #10
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If you need to replace hte m90, step up to a modified one while you're at it.

Gen 5 anyone?
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