Wobbling supercharger hesitation - 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 05-21-2006, 09:15 PM   #1
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Default Wobbling supercharger hesitation

I've took it upon myself to search for any posts regarding supercharger hesitation.... Saturday I was traveling on backroad and was behind a BIG old truck ( going 20 below!) so I looked around the truck and could see a car a safe distance awayfor passing.. I decided to punch it around 40 - 44mph to see how responsive she is. .......... Well I didn't pass due to a * - l - o - w acceleration I then notice how poorley the engine was missing gears. Sunday I took my brother on a short drive to show him the problem. when it gets to about 45 - 50 mph I punched it...The supercharger whine creates a wobbling sound and you can feel it while accelerating intermentinly you can feel what the boost should be like.

Anyways We are stumped here and if anyone has any thoughts or have had this problem let me know what to look for/ do.
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Old 05-21-2006, 09:24 PM   #2
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In my experience, this has been a fueling problem. My pump got weak during high demand, went lean, PCM saw detonation, BCS makes SC flutter as it dumps lotsa boost. Can you get a fuel pressure gauge with a LONG hose on it so you can watch the pressure as you drive?
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Old 05-21-2006, 09:53 PM   #3
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Thanks a lot for getting back to me that sounds like a good idea but unfortunatley we do not own a fuel pressure guage. Any other suggestions.../ or how much FPG'* are and where can you find them.
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Old 05-21-2006, 10:02 PM   #4
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Quote:
Originally Posted by beckster
Thanks a lot for getting back to me that sounds like a good idea but unfortunatley we do not own a fuel pressure guage. Any other suggestions.../ or how much FPG'* are and where can you find them.

Get one at NAPA or Autozone, or similar.
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Old 05-22-2006, 08:54 AM   #5
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Look over the belt and pulley as well while you are under the hood for belt slippage.
I've never experienced it, however I hear it sounds like a flutter.
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Old 05-23-2006, 08:34 PM   #6
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My dad is out of town for the moment. But I've looked over all of the belts and pulleys and have seen no slippage. Just replaced fuel filter and still no change. The wobbling supercharger usually happens when the pedal is put down more than half way. Not quite sure if burnouts would have anything to do with this..... I tried to see if I could get anything the night before, (not sure if this helps)
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Old 05-23-2006, 08:46 PM   #7
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Sounds like fuel pressure might be the issue im gunna try to pull some codes and let you know how it goes from there.
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Old 05-24-2006, 02:04 AM   #8
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i think it is a fuel issue, my car does that from time to time!!
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Old 05-24-2006, 02:51 AM   #9
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I have the same issue with my */C and I have a new pump on order. I am hoping this resolves the issue. I'll let you know when I get it installed.
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Old 05-24-2006, 08:54 AM   #10
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Quote:
Originally Posted by beckster
Sounds like fuel pressure might be the issue im gunna try to pull some codes and let you know how it goes from there.
Pulling codes will tell you very little or nothing about fueling. You need to check the fuel pressure at the rail.
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