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Anyone know what the little 1inch tube going into the airbox comes from?

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Old 10-18-2001, 04:53 PM
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Default Anyone know what the little 1inch tube going into the airbox comes from?

it is right under and to the left of the main intake tube. Just wondering where its from and it purpose?
any help would be greatly appreciated
Old 10-18-2001, 05:38 PM
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it goes to the smog pump, it runs when you first start your car
Old 10-19-2001, 07:01 AM
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Default Speaking of SMOG pump...

I looked at the Mitchell repair guides for the S4, and they show a smog pump (along with the relay and solenoid to control it) on the engine schematic.

However, when I took my engine apart, I never found this. It doesn't exist on my car.

Do US models (or California) come with a smog pump and Canadian models don't?
Old 10-19-2001, 03:12 PM
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Default hrmmm, i did get my car in CA............

it is possible, IIRC its purpose is to reduce emissions on start up and speed up the
engine/cat-conv warm up time
Old 10-20-2001, 05:19 AM
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That tube to the smog pump is to inject air to the cat and Audi got ULEV emissions certification.
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