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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 11-13-2012, 06:08 PM   #21
ixtoxi
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Quote:
Originally Posted by scarede46er View Post
The high idle is caused by the Secondary Air Pump which allows the cat to heat up faster (an emission issue). European cars, imo, do not have the pump. Also, there is this thing called fast idle and slow idle. It fast idles immediately after you come to a rest. During extended stops with the engine running, it should drop to slow idle.
This is not correct. The secondary air pump has nothing to do with idle speed. The secondary air pump simply pushes more air into the exhaust stream until the catalyst heats up.
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Old 11-13-2012, 06:46 PM   #22
scarede46er
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Originally Posted by Ilovecars800490 View Post
They got rid of this system in most cars with Drive by wire throttle body.

old cable throttle body had a fast idle system which worked like a choke on a carburetor.

Modern cars choke automatically. Your car is suppose to run rich on cold start ups which is why high idle is needed until warm up.

Ah ha. Thanks for clearing that up, mate.
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Old 11-13-2012, 06:47 PM   #23
scarede46er
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Originally Posted by ixtoxi View Post
This is not correct. The secondary air pump has nothing to do with idle speed. The secondary air pump simply pushes more air into the exhaust stream until the catalyst heats up.
What did I say? I said exactly the same thing. Let me quote myself: The high idle is caused by the Secondary Air Pump which allows the cat to heat up faster (an emission issue). European cars, imo, do not have the pump.
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Old 11-13-2012, 06:53 PM   #24
lcoleman
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^Wrong. SAP doesn't raise idle speed, and e46s have a huge one...

Not sure what BMWs have a "fast idle" setting on the throttle body, but e30s and e36s at the very least have electronically-driven idle control valves, and thus DME-controlled idle, just like e46s.
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