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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-20-2008, 01:20 PM   #1
blefevre
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What is the air pump?

Well I thought I knew a lot about cars but apparently not.

I am looking at trading my E46 for a different one and the records show that there was an air pump failure three times in its life. I have no idea what this is, if its a huge problem, cost to replace, etc. All search really turns up is people fixing it themselves and such, but no real description of the part.

Any quick info would be great! sorry for the noob question.
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Old 09-20-2008, 02:02 PM   #2
jeffro3000
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the secondary air pump?

that pumps fresh air into the exhaust during warm up, basically to give the illusion of less emissions. i think
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Old 09-20-2008, 02:12 PM   #3
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Quote:
Originally Posted by jeffro3000 View Post
the secondary air pump?

that pumps fresh air into the exhaust during warm up, basically to give the illusion of less emissions. i think
true. but it's not to create an illusion lol.

it pumps air into the exhaust to help burn any unburned fuel. this prevents unburned fuel from exiting the tailpipe and also helps to warm up the catalytic converter quicker.
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Old 09-20-2008, 02:23 PM   #4
brediv12
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Originally Posted by UKtRAINE3 View Post
true. but it's not to create an illusion lol.

it pumps air into the exhaust to help burn any unburned fuel. this prevents unburned fuel from exiting the tailpipe and also helps to warm up the catalytic converter quicker.
Does that mean if your air pump is not working and it's cold outside, your car will have trouble starting?
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Old 09-20-2008, 02:40 PM   #5
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Does that mean if your air pump is not working and it's cold outside, your car will have trouble starting?
no. the air pump has nothing to do with start issues.
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