Some times when I start the car (a few times, not always and from a short time) I hear a strange noise from the engine, like a vacuum, I can not describe it. Any advice?

Thanks!

 

It may the secondary air injection pump. It should only occur on cold startup and last a minute or less.

 

I had a one second noise at start up that turned out to be a loose top on one of my DV's.

 

On cold startup and last less that 5 seconds. It is bad???

 

I hear the same thing, i think its the air pump. I believe its there to help the engine warm up.

 

It is bad, should i be worried??

 

If it is for sure the pump no worries. It's an emission device to capture exhaust fumes on cold fire up before the catalysts warm up.

 

I don't have cats, see me sign.

 

Regardless if you have cats or not the computer will activate that function.

 

So I shouldn't be scared of something bad...

 

No, it's just an emissions system part that can't hurt the engine. Still, you need to get it taken care of sooner or later.

 

I need to change all the system or something else? Do someone knows the costs of this repair? Thanks!

 

I have the same problem. What is a BV? Is it a DIY repair? Thanks, Bob

 

How long have you owned the car? Has it done this from the outset or just started? Did it start after some mod?

The engine controller turns on the secondary air injection pump upon a cold engine start. This pump can sound like a hoover (vacuum cleaner) running in the distance. The air pump runs from seconds to maybe a minute depending upon ambient air temp engine temp etc.

This noise is normal but it should have been present from the 1st day you got the car, assuming temps where you are are not high enough the secondary air injection pump is switched on. Many 'new' car owners hear this for the first time upon the 1st cold day in the fall after having driven the car all summer without hearing the noise.

Sincerely,

Macster.

 

Thanks for the reply Macster, I have the car for about 4 years and from 6 months is tuned, it started to sound like this for about one month but it doesn't to it all the time.

Thanks!