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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 09-14-2005, 01:04 AM   #11
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Now that I think about it, I have seen my BCS dump in a fluttery fashion. It did it a lot more before I put in a new one, but it still occasionally does it, usually following a high RPM shift.
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Old 09-14-2005, 01:09 AM   #12
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Like so in the video i recorded ? Wouldnt that set off a ses light?
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Old 09-14-2005, 10:14 AM   #13
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No SES light as long as the BCS is doing what the PCM says. My old one just seemed hyper.
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Old 09-14-2005, 10:16 AM   #14
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Quote:
Originally Posted by jwikoff99
No SES light as long as the BCS is doing what the PCM says. My old one just seemed hyper.
Just the BCS or the actuator as well? I've got an old BCS that was setting a SES light but worked w/o fluttering..lol..

Would be a good tester.
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Old 09-14-2005, 10:19 AM   #15
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The PCM will have no idea what the BCA is doing. The MAP sensor doesn't feed to the PCM. Your old BCS may do nothing at all. Just unhook the BCS and see if the fluttering stops. But don't necessarily replace it, cause it could just be trying to fix another problem.
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Old 09-14-2005, 01:42 PM   #16
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Without the BCs i wont get boost i thought.... I never get the flutter until my engine creates boost.... IS there a way to just for a test run have it dumping full boost all the time for testing purposes?
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Old 09-14-2005, 03:25 PM   #17
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Quote:
Originally Posted by LuxuriesPremier
Without the BCs i wont get boost i thought.... I never get the flutter until my engine creates boost.... IS there a way to just for a test run have it dumping full boost all the time for testing purposes?
The BCS can only dump boost. It is totally unnecessary, except when the PCM feels the need to dump boost when shifting, or a problem is seen.

To run without boost, unhook the vac line from the top of the BCA, plug the line so you don't have a large vacuum leak, and rotate the wastegate valve shaft so the "foot" is pointing up and do something to hold it upright like that.

To run full boost all the time, do the same, but leave the valve shaft "foot" horizontal.
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Old 09-14-2005, 04:25 PM   #18
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Thx I will try that today. Ill let you know if i run into the same problems
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Old 09-14-2005, 11:50 PM   #19
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Hey i pulled the MAF to check it otu see if ti was good. What are the resistance readings i should be getting? Do i measure across a b and c or the actual filaments?
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Old 09-15-2005, 12:33 AM   #20
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You can't check a MAF sensor for resistance. Get a scantool. And an FSM.
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