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      01-21-2013, 01:31 PM   #9
FIRST1
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Drives: '08 135i Titanium Silver
Join Date: Sep 2010
Location: LI

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2008 BMW 135i  [0.00]
Quote:
Originally Posted by Stohlen View Post
When you first start the engine, the vehicle starts in whats called "open loop". This is a feature of the obd2 system in which the engine controls the vehicle in a very inefficient manner that is intended to pollute as little as possible while warming the engine and the catalytic converters up to operating temperature. The engine is run at a higher rpm to accomplish this in less time because open loop is very bad on both gas and power. When the engine rpm drops down to normal (600-700 rpm) the vehicle goes into closed loop, which is the normal operating parameters of the engine.
^ Thanks, good info!
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