I'm confused.... (Low boost) - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

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Old 06-30-2006, 07:12 PM   #11
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Quote:
Originally Posted by wjcollier07
well u did say it happened after u replaced the supercharger..maybe a bad supercharger
the first one I replaced was a floz one, but it seemed to work fine. The one I have on it now is one that willwren gave me that is ported which he use to use on his 93 SSEi.
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Old 06-30-2006, 07:13 PM   #12
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You said it was fine , then you changed the SC and it lost oomph, so sounds like you need to look for vac leak at SC or a line , is the boost actuator working properly.Check , check , check for vac leaks
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Old 06-30-2006, 07:28 PM   #13
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Need to see if the BCA and BCS are working properly. Superchargers don't produce low boost unless they lose their coating, and Gen2 superchargers don't have coating. It'* either belt slip or a vacuum leak or a bad component (BCA or BCS).

John, do the Bypass trick and see if you get full boost back. Scan and check for KR when you make that run.
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Old 06-30-2006, 07:32 PM   #14
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Quote:
Originally Posted by willwren
Need to see if the BCA and BCS are working properly. Superchargers don't produce low boost unless they lose their coating, and Gen2 superchargers don't have coating. It'* either belt slip or a vacuum leak or a bad component (BCA or BCS).

John, do the Bypass trick and see if you get full boost back. Scan and check for KR when you make that run.
ok, I don't think it'* belt slip because it'* steady when it gets to 1-2lbs of boost. Bypass trick in techinfo? BCA=Boost Control Actuater and BCS= Boost Control Solenoid? Am I correct? It dosen't look like a vacume leak, I can't see anything anyhow...
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Old 06-30-2006, 08:44 PM   #15
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Uh... when your modulator was replaced...did they forget a check valve?
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Old 06-30-2006, 10:49 PM   #16
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I dont know, but mine would connect NOW, and with alot of force, and spin em like it was nothing at all...How hot is it outside?
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Old 07-01-2006, 12:40 AM   #17
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As far as I know, there is no check valve on the vacuum line to the modulator on ours, at least not on mine. Like Bill said, pull the vacuum elbow between the BCA and BCS off and see if your boost returns.

And try this: with it idling, pull the vac line off the top of the BCA. Does the rod push all the way out so the foot hits the base of the SC? Be prepared to put the line back on, it may rev, I've never done it myself.
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Old 07-01-2006, 01:03 AM   #18
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Another thought, got a scan tool? What does it say for boost percent when this happens?
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Old 07-01-2006, 01:04 AM   #19
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It won't rev. That'* the test we'll do tonight.

I just got a text message from John to expect a call soon. We'll go 'live' on both cars simultaneously.
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Old 07-01-2006, 01:46 AM   #20
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John called while on the freeway. I made him pull over and get out.

Looks like the BCA won't full-travel in either direction. He'* going to remove it, clean it, and lubricate it. Hopefully tomorrow.
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