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Re: Moaning & Groaning... (ooh! raunchy!)
Posted by TR (more from TR) on Wed, 19 Dec 2001 17:44:42
In Reply to: Moaning & Groaning... (ooh! raunchy!), Adrian, Wed, 19 Dec 2001 16:49:56
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I don't know about the second groan, but the first groan sounds very much like the secondary air injection pump. When the car is started cold, this pump kicks in to heat up the cat. If the car is accelerated while this pump is running it causes a vibration that sounds very similar to what you speak of. As soon as the engine speeds up a bit, the pump shuts off and the groan is gone. Unless the pump comes back on, you won't hear it again until the next cold start. The moaning is normal for the age of the car, and is caused by exhaust being forced from the engine at higher pressures than the pump can produce, and backflowing through the regulator valve.
posted by 63.164.20...
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