LeonTT

Picture is of course a Fozzie but mine is a Hawkeye STI.

For the last 2 mornings, when i first start the motor, it has started making a high speed whirring noise (like a dremel) but only last about 1-2mins, then stops making the noise.

There is only 1 pipe going into it and this pipe splitsand goes to something located under the intercooler (can't quite see very well).

Thanks, Leon

bushiwarrior

intrested in the answer too as ive always wondered.

LeonTT

Maybe some kind of vacuum pump but really got no idea, plus not had any probs before so never had to tinker

cusco kid

its the air pump for the inlet manifold .

LeonTT

Thanks mate.

Forgive my ignorance, but could someone explain what it does exactly?

bushiwarrior

to pump air into the inlet manifold

LeonTT

Well clever clogs, i was after a detailed explaination., but maybe you can answer the following.

With my limited knowledge of turbo'd engines, why would you want to "pump" air into the inlet manifold when this air is already compressed from the turbo?

Plus this pump still has just one pipe connected to it so where is it getting the air from to "pump" into the inlet manifold??

Look forward to your answers,

Leon