Re: Grating noise

The secondary air pump will only run for the first 30 to 120 seconds
when the car is first started. The ECT will tell the ECM how long to
keep the pump on. The pump is low on the car and I have seen water get
in the pump and eventually cause the motor to get louder becasue the
bearings dry out. Start the car (do not drive) and go up front and
listen to the fan. If the noise goes away when the fan stops than the
fan needs replacing. VW has a similar problem and when water gets in
the (colder climate) the pump will freeze and blow the fuse.



On Sun, 09 Dec 2007 23:51:42 GMT, "check the meaning"
<humancondition@[EMAIL PROTECTED]
> wrote:

>Hi,
>My A4 2k  has started making a grating noise from about where the exhaust

>cat is situated, the noise is only present when i start from cold, the
noise 
>dissapears after about 2 mins, any ideas??
>Thanks.