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      01-19-2013, 02:20 PM   #1
FIRST1
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Questions about start-up

So I am curious as to the process of the engine when the car is turned on. What does it do? Here's what I noticed:

The RPMs idle at 600 and it takes about 60 seconds.

What I wanna know is if your car takes the same amount of time? and if it idles at 600 as well? Maybe if there is deviation it could be a way to detect other things.
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      01-19-2013, 06:46 PM   #2
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Idle of about 600 is perfect. About 1minute depending on ambient temp is about right also.
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      01-19-2013, 10:23 PM   #3
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Ditto
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      01-20-2013, 12:05 PM   #4
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When I start mine (135), it revs quite high (warm or cold), and then settles back to about 600. But when it's warm and I come to a stoplight, the idle will often jump up to 900 or so, and then settle back, or jump once again. The exhaust tips are a little greasy as well - all making me think the computer is off, making the car run rich and uneven. I took it to the dealer a couple of weeks ago, but they said it was normal. Does anyone (or everyone?) have this issue?
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      01-20-2013, 01:46 PM   #5
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Mine starts out at 1000-900ish rpms and settles down to 6-700 where it idles when warm. The cold intensifies the process.
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      01-20-2013, 02:28 PM   #6
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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.
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      01-20-2013, 02:30 PM   #7
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Quote:
Originally Posted by bbbbmw View Post
When I start mine (135), it revs quite high (warm or cold), and then settles back to about 600. But when it's warm and I come to a stoplight, the idle will often jump up to 900 or so, and then settle back, or jump once again. The exhaust tips are a little greasy as well - all making me think the computer is off, making the car run rich and uneven. I took it to the dealer a couple of weeks ago, but they said it was normal. Does anyone (or everyone?) have this issue?
That all sounds normal. If your car is hot when you come to a stop light, its not uncommon for the rpms to rise to feed the alternator when the fans kick on.
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      01-21-2013, 03:55 AM   #8
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Quote:
Originally Posted by 135Pats View Post
Mine starts out at 1000-900ish rpms and settles down to 6-700 where it idles when warm. The cold intensifies the process.
+1 mine does the same
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      01-21-2013, 01:31 PM   #9
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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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