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post #1 of 23 (permalink) Old 06-22-2009, 07:42 PM Thread Starter
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Vacuum Noise

I drive a 2001 Discovery, when I start the Rover, i hear a noise coming from under the hood. To me it sounds like it is some kind of vacuum line. Does any one have any idea what it might be?
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post #2 of 23 (permalink) Old 06-22-2009, 07:48 PM
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Does it whine for a few minutes, and then go away? If this is the case, it is secondary air I think. There has been some discussion recently on this.


2004 Disco SE7 - Totalled
2002 330 ci
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post #3 of 23 (permalink) Old 06-22-2009, 08:52 PM Thread Starter
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Yeah it only makes the noise for a minute or two, and then it stops.
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post #4 of 23 (permalink) Old 06-23-2009, 02:39 AM
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Mine does the same thing when I first start up in the morning. It's the Secondary Air Injection and it runs for about 2 minutes then quits. I've been told it's a polution device but don't really know what it's purpose is (gotta keep the greenies happy I guess). Maybe someone who knows more about it can enlighten us.
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post #5 of 23 (permalink) Old 06-23-2009, 05:02 AM
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Originally Posted by Grover Rover View Post
Yeah it only makes the noise for a minute or two, and then it stops.
Thats what she said.


2004 Disco SE7 - Totalled
2002 330 ci
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post #6 of 23 (permalink) Old 06-23-2009, 05:15 AM
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Mine does the same thing when I first start up in the morning. It's the Secondary Air Injection and it runs for about 2 minutes then quits. I've been told it's a polution device but don't really know what it's purpose is (gotta keep the greenies happy I guess). Maybe someone who knows more about it can enlighten us.
Wikipedia knows *EVERYTHING* Secondary Air Injection
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post #7 of 23 (permalink) Old 06-23-2009, 05:31 AM
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Nice find, still learning something every day!


2004 Disco SE7 - Totalled
2002 330 ci
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post #8 of 23 (permalink) Old 06-23-2009, 05:55 AM
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Wikipedia knows *EVERYTHING* Secondary Air Injection
I'm not worthy
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post #9 of 23 (permalink) Old 06-23-2009, 05:55 AM
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Thats what she said.
That's kinda stretchin it... but it's still okay
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post #10 of 23 (permalink) Old 06-23-2009, 08:04 AM Thread Starter
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Right after I posted that, I noticed that other thread that was discussing the same thing. From what I understand, it isn't really a big deal. Right?
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post #11 of 23 (permalink) Old 06-23-2009, 08:30 AM
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I'm not too worried about it, especially since i'm not the only one w/ the sound.


2004 Disco SE7 - Totalled
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post #12 of 23 (permalink) Old 06-23-2009, 09:13 AM
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Right after I posted that, I noticed that other thread that was discussing the same thing. From what I understand, it isn't really a big deal. Right?
Not at all. If your truck is equipped with SAI it's normal.
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post #13 of 23 (permalink) Old 06-23-2009, 07:36 PM
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Does it whine for a few minutes, and then go away? If this is the case, it is secondary air I think. There has been some discussion recently on this.


Is the secondary air superior to a Disco II without it?

I don't have seconday air. There is just a space there.

Should you / can you spend money to upgrade it?
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post #14 of 23 (permalink) Old 06-23-2009, 07:41 PM
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Is the secondary air superior to a Disco II without it?

I don't have seconday air. There is just a space there.

Should you / can you spend money to upgrade it?
HELL NO!!!!

It adds weight and "reduces" emissions at startup. Nobody really cares (do they?)

Then again, it is your truck. You CAN put it in there and get the ECU from a truck with secondary air, but there is no good reason.

This site sucks balls.
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post #15 of 23 (permalink) Old 06-24-2009, 04:21 AM
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x2... just adds one more thing to go wrong.
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