Vacuum Under my Hood
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Drifting
Joined: Sep 2009
Posts: 29
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Vacuum Under my Hood
When I start my 2004 Disco every morning I hear what seounds like a Vacuum Cleaner turn on and then after about a minute it shuts off. It happens everyday when first starting and then I never hear it again but maybe once a week in the middle of the day while drving through downtown.
Pro Wrench
Joined: Feb 2008
Posts: 1,706
Likes: 3
From: Meridian, Idaho
It goes bad when it makes noise 
. At least I think, I don't know too much about it cause I don't think my rover has it. I don't think it necessarily hurts anything if its malfunctioning, its there to assist the vehicle when starting on a cold morning.
. At least I think, I don't know too much about it cause I don't think my rover has it. I don't think it necessarily hurts anything if its malfunctioning, its there to assist the vehicle when starting on a cold morning.
It is your secondary air injection.
Yours is making noise because the filter to it needs to be replaced.
Its purpose is to force fresh air into the raw exhaust to aid in the heating up of the catalytic converters.
Think of it as a black smiths bellows, you know when he uses the bellows to force air onto his fire and then it gets big and hot?
The SAI does the same thing.
A engine pollutes the most when it is cold, over half of your emissions is in the first 5 miles of driving, thats why frequent shorts trips are so hard on a car and the environment.
SO if you are going to make a quick trip to the corner store for a gallon of ice cream take the car that was driven last, either yours or your wifes because it will reach temp faster and pollute less.
Your cats work best when hot, the forced air gets them to temp in a min or two, thats why it shuts back off, the cats are at temp.
Your MPG is also cut in half when you drive with a cold engine, thats why your MPG drops in the winter time, if you live where it gets cold that is.
Yours is making noise because the filter to it needs to be replaced.
Its purpose is to force fresh air into the raw exhaust to aid in the heating up of the catalytic converters.
Think of it as a black smiths bellows, you know when he uses the bellows to force air onto his fire and then it gets big and hot?
The SAI does the same thing.
A engine pollutes the most when it is cold, over half of your emissions is in the first 5 miles of driving, thats why frequent shorts trips are so hard on a car and the environment.
SO if you are going to make a quick trip to the corner store for a gallon of ice cream take the car that was driven last, either yours or your wifes because it will reach temp faster and pollute less.
Your cats work best when hot, the forced air gets them to temp in a min or two, thats why it shuts back off, the cats are at temp.
Your MPG is also cut in half when you drive with a cold engine, thats why your MPG drops in the winter time, if you live where it gets cold that is.
It is ontop of it, you remove a couple of screws and it will come out, then replace it with another filter type material.
you can use the foam air filter from a push mower, or the foam filter from a window a/c unit.
you can use the foam air filter from a push mower, or the foam filter from a window a/c unit.
Rock Crawling
Joined: Apr 2009
Posts: 377
Likes: 4
From: Chicago, IL
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