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Old 11-04-2009, 01:38 AM   #1
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Default Noises?

When i accelerate i hear a hissing noise (best way to describe it) coming from the dash board but i was told it was an exhaust leak... there is a noise coming from the back of the motor in which they say it is that but to me that doesn't seem right... could it be something else? maybe a gasket bad or something... it only makes that noise when im accelerating or if they car is idling if u listen really really really closely on the inside u can hear it but under the hood the noise from the back of the motor i know is not normal but i wanted to ask first.
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Old 11-04-2009, 08:14 AM   #2
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There are some vacuum lines under the dash to control the HVAC system. Check those.
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Old 11-04-2009, 08:36 AM   #3
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Who told you of this exhaust leak? If it'* a mechanic, I'm inclined to believe them and would be checking the O2 sensor in the manifold. I've seen them loosen up and cause leaks. Very easy and quick to fix.
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Old 11-04-2009, 01:31 PM   #4
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What if he were to try Seafoam in the top end (brake booster vac line) and watch the engine bay and under the car for smoke?
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Old 11-04-2009, 01:37 PM   #5
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Any seafoam treatment on the top end would blow smoke out of any leak.
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Old 11-04-2009, 01:46 PM   #6
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Tony, if you are having a difficulty time locating the leak you can use a vacuum port to suck some Seafoam into the intake manifold. It will give the top end a good cleaning, but it will also smoke the exhaust like a son of a gun. You will be able to see any exhaust leaks.

Do a search on the Bonneville Forum for Seafoam, and/or ask us if you need help.
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Old 11-04-2009, 02:24 PM   #7
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okay ill try that thank you all for helping
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Old 11-04-2009, 02:40 PM   #8
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Let us know what happens.
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