98 Bonne Throttle Body Whistle / Fixed! - 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 12-31-2008, 08:17 AM   #1
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Talking 98 Bonne Throttle Body Whistle / Fixed!

A while back I posted a thread in regards to throttle body interchange as it had a whistle at 1/3 throttle and not a vacuum leak. Per Agrazela the 98 TB had a wierd lip at the bottom of the throttle plate and he had the same noise. I got a 99 TB free for parts and I changed out the throttle plate on the 98 TB with 99 TB and the whistle is now gone. The 98 TB does have a wierd lip on the bottom. The 99 TB plate is similar but has grooves in the bottom and no small lip. This was a very annoying whistle and sure made one think there was a vacuum leak.Yes I did put locktite on the TB plate screws. No codes and it drives real good. Thank you to Agrazela & Dan much for the input as I have been fighting that one for a year.
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Old 12-31-2008, 10:07 AM   #2
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Glad you got that taken care of. What'* your plans for the old TB?
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Old 12-31-2008, 11:48 AM   #3
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The guys at GM told use what I needed and just return the rest. Small town help from the Medford guys.
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