Questions about start-up - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)

FIRST1 · 01-19-2013, 02:20 PM

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.

b1aze · 01-19-2013, 06:46 PM

Idle of about 600 is perfect. About 1minute depending on ambient temp is about right also.

rking117 · 01-19-2013, 10:23 PM

Ditto

bbbbmw · 01-20-2013, 12:05 PM

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?

135Pats · 01-20-2013, 01:46 PM

Mine starts out at 1000-900ish rpms and settles down to 6-700 where it idles when warm. The cold intensifies the process.

Stohlen · 01-20-2013, 02:28 PM

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.

Stohlen · 01-20-2013, 02:30 PM

Quote:

Originally Posted by bbbbmw

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.

RimasRS · 01-21-2013, 03:55 AM

Quote:

Originally Posted by 135Pats

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

FIRST1 · 01-21-2013, 01:31 PM

Quote:

Originally Posted by Stohlen

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!

01-19-2013, 02:20 PM	#1
FIRST1 Lieutenant Drives: '08 135i Titanium Silver Join Date: Sep 2010 Location: LI / Bronx Posts: 421 iTrader: (0) Garage List 2008 BMW 135i [0.00]	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, 10:23 PM	#3
rking117 Lieutenant Drives: Z4 3.0i & 128i Join Date: Aug 2012 Location: Central Florida Posts: 430 iTrader: (0)	Ditto __________________ Enjoying an E89 Z4, E82 128i and Fiat Pop 500 / Missing my E85 Z4 (sold)

01-20-2013, 01:46 PM	#5
135Pats Gooby Pls. Drives: 135i Join Date: May 2012 Location: Maryland Posts: 1,556 iTrader: (0)	Mine starts out at 1000-900ish rpms and settles down to 6-700 where it idles when warm. The cold intensifies the process. __________________ E88 FBO N54 Alpinweiss/Coral Red/Meisterschaft Race/Berk Resonated/Macht Schnell 3"/ER CP/Synapse/VRSF FMIC/BMS DCI/BMS Thermostat Delete/Rob Beck PCV/BMS OCC/Cobb 4.02/Alpina TCU Flash/Icarbon/3D Design/Cyba

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01-19-2013, 06:46 PM	#2
b1aze Through detox Drives: 2010 135i Join Date: Aug 2012 Location: Marlborough, MA Posts: 1,074 iTrader: (13)	Idle of about 600 is perfect. About 1minute depending on ambient temp is about right also.

01-20-2013, 12:05 PM	#4
bbbbmw Private Drives: 135i Join Date: Nov 2012 Location: Southwest Posts: 98 iTrader: (0)	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?

01-20-2013, 02:28 PM	#6
Stohlen Lieutenant Drives: AW 135i Join Date: Aug 2012 Location: South Lyon Posts: 529 iTrader: (1) Garage List 2008 BMW 135i [5.00]	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.