What is this BUZZZZZZ?
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,484
Likes: 0
From: Nanaimo, BC
What is this BUZZZZZZ?
I have got a "buzz" in my 91 L98 A4 Coupe..... I can't pinpioint location, but it certainly seems to be coming from the area around the pre-cats, transmission, cataltytic converter.... somewhere in that area. I tried the old piece of hose trick, but still can't nail down what is making the noise. Buzz is the best term I can think of to describe the noise. Makes the noise both in park or drive. I can't hear it when the car is moving or when in the car, but outside of the 
car the noise is quite evident
Has anybody had something similar? Any thoughts on what it might be? I'm going on a 1500 mile trip in about 10 days and I'm a little concerned.... Thanks in advance for any suggestions / ideas.
car the noise is quite evidentHas anybody had something similar? Any thoughts on what it might be? I'm going on a 1500 mile trip in about 10 days and I'm a little concerned.... Thanks in advance for any suggestions / ideas.
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,484
Likes: 0
From: Nanaimo, BC
So there is no way to get to it / fix it without ripping the tranny tranny apart? 
Glad to hear that it's not hurting anything (assuming that's what it is!!) but it is certainly annoying.
Glad to hear that it's not hurting anything (assuming that's what it is!!) but it is certainly annoying.
Race Director
Joined: Aug 2003
Posts: 11,043
Likes: 3
From: San Jose Pat Tillman - American Hero
I've had buzzes from two other sources. The first was a catalytic convertor that was coming apart on the inside. The pieces that were crumbling had worked their way to the bottom and would "buzz" at a certain RPM. The other buzz I had, which coincedentally sounded almost exactly the same, was a loose O2 sensor in the bung. It happened immediately after my LT header install, so I think the tech forgot to tighten the O2 all the way.
I was able to pinpoint both by laying under the car (with it off, of course) and tapping on different parts of the exhuast until I pinpointed the culprit. I don't know if either of these are similar to your problems, but I hope you are able to get it fixed before your trip. Piece of mind on a roadtrip is so valuable...
I was able to pinpoint both by laying under the car (with it off, of course) and tapping on different parts of the exhuast until I pinpointed the culprit. I don't know if either of these are similar to your problems, but I hope you are able to get it fixed before your trip. Piece of mind on a roadtrip is so valuable...
Race Director
Joined: Sep 2004
Posts: 13,793
Likes: 0
From: St. Peters MO Sometimes you have to prove yourself by doing alot of killing or alot of dying...
Originally Posted by smack123
TTT - Any other thoughts from anyone?
... a buzzing noise from a vette... is it a Chevette by chance??? 
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,484
Likes: 0
From: Nanaimo, BC
Originally Posted by kwik_ta
... a buzzing noise from a vette... is it a Chevette by chance??? Yes, fine...the truth is I own a Chevette and not a Corvette. My avitar is just a pipe dream
Chris, you told me this Chevette was mint when I bought it from you. How could you steer me wrong? You'll be hearing from my lawyer.
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,484
Likes: 0
From: Nanaimo, BC
Originally Posted by Perfusion
I've had buzzes from two other sources. The first was a catalytic convertor that was coming apart on the inside. The pieces that were crumbling had worked their way to the bottom and would "buzz" at a certain RPM. The other buzz I had, which coincedentally sounded almost exactly the same, was a loose O2 sensor in the bung. It happened immediately after my LT header install, so I think the tech forgot to tighten the O2 all the way.
I was able to pinpoint both by laying under the car (with it off, of course) and tapping on different parts of the exhuast until I pinpointed the culprit. I don't know if either of these are similar to your problems, but I hope you are able to get it fixed before your trip. Piece of mind on a roadtrip is so valuable...
I was able to pinpoint both by laying under the car (with it off, of course) and tapping on different parts of the exhuast until I pinpointed the culprit. I don't know if either of these are similar to your problems, but I hope you are able to get it fixed before your trip. Piece of mind on a roadtrip is so valuable...
My gut feeling all along has been cats...but we'll see. Thanks all for the tips.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski