I recently took the bird's nest as you guys call it off my 85 GLS and installed headers. When the car is warming up and I'm decelerating to a stop sign it sounds almost like a helicopter landing. I'm assuming it's running rich and the noise is coming from the exhaust. Once it warms up it's okay. Any thoughts. Thanks!

 

I think you mean the rat's nest.

As for the helicopter decel, my '82 did that. I think it has something to to with a non-functional shutter valve. Then again, my '79 doesn't have a shutter valve (they hadn't been implemented until '81) and it doesn't make that noise.

Anyone else have any thoughts?

 

I have no emissions and a locked shutter valve, strait pipe exhaust and mine sounds like a jet engine upon decel (I run a little rich) it is nothing more then a bunch of small backfires in my application (usually get one good ground shaking backfire on a high rpm decel) but you need to be more descriptive in the sound it makes



ps my car also sounds like a tornado in high revvs because of the 17" flex fan under the hood

peace