PLEASE HELP!!!! NO BOOST AFTER WORM UP AND LOUD RATTELING!!! - 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 09-19-2007, 11:07 AM   #11
DINOSAURUS BOOSTUS

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IIRC that quad driver controls three soleniods.

Boost Control
Evap
Torque Converter Clutch.

If any of the three on are bad..or something associated with them is wrong..you'll get that code.

I'd say you may have a bad BCS..but we can test further.

You probably won't feel a misfire unless it'* brutal. Get the scope..let'* find out what'* making noise. Before replacing a supercharger BCS, let'* get the other stuff fixed.
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Old 09-19-2007, 11:11 AM   #12
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i just looked up the Quad-Driver " B " Fault and the info i found is

" Vacuum sensor circuit fault or quad driver "B" fault
(3.8L VIN1)
Corrosivity/add coolant"

now i just fixed a good 5 or 6 vacuum hoses but is there somthing im not thinking of? what else as far as a part could be leaking the would affect the Boost?
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Old 09-19-2007, 11:13 AM   #13
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cool thanks again...ill get back to you on that
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Old 09-19-2007, 11:21 AM   #14
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Fix the rattle..then worry about boost level.

While you have a Quad B fault..it could be something else. Reason I say this is that rattle could be loud enough that the PCM is holding things back.

We need to Fix A...then talk about B if it still exists.
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Old 09-19-2007, 08:13 PM   #15
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ok thanks man...ill get back to ya!
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Old 09-19-2007, 08:15 PM   #16
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oh just to add....the bcm has been holding back for quite some time...way befor the raddle.
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Old 09-19-2007, 09:34 PM   #17
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ok i got the scope and it sound like its coming from the pulley at the front of the car near the ground...the Air conditioner one i think...by the way the scope it like the coolest tool i have ever used...i took the time to poke and prod all over the place under the hood just to hear what **** sounds like...lol

so what do i do from here...if the air pulley is the case what do i do to replace it...is it just the pulley or is it the whole unit?



thanks again for all the help!!!!!!
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Old 09-20-2007, 09:30 AM   #18
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Some folks replace the AC clutch and others replace the whole AC compressor. Either way the compressor must come out to be fixed or replaced. Some shops charge less for only the clutch..but labor ends up costing much more.

Check out your local prices and make your decision from there.

BCS..lol not BCM.. BCM is something else

And yes..everyone should own a stethescope. It'* not only cool..but VERY handy.
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Old 09-20-2007, 10:32 AM   #19
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ok cool....so now we know about the sound what about the boost issue? you said there is a way to test to find out.....

thanks for all the help!
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Old 09-20-2007, 10:41 AM   #20
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Problem B is probably best for the Forced Induction area. Post it up seperately over there and we'll get you testing the BCS and BCA
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