Cold start misfireing 2-3 times

[SHADOW4]

After leaving the car in the garage 20-22 degrees C for a longer period (more than 18-20 houres.
The engine missfires 2-3 times when rpm drops from 1300 down to 1000 rpm. I have 500km now and this missfires started after 250-300 km. I use Shell V-power 99+ octane. Somewhere on the line i started to let the engine (turbos) cool down about 1- 1 1/2 minutes before stopping the engine (old turbos needed this)

Anyone else have misfires?

And the steering! I'm gonna use juhaps poetry about the Volvo and tell BMW how my car handles when initiating a lane-change. Feels like you have to turn the steeringwheel 2-3 cm before the car listen to your commands, In norm, sport and sport+. I hope a bottle of green walking can make an serviceminded tech-guy press the wrong button. and ooops, that was for the 35iS! Well now that it's there we better let it be so we dont destroy anything. Then I'll do this:

Other than that it's a superlative vehicle!

[teagueAMX]

Shadow, don't know if I'm reading you correctly, but 20 - 22 c converts to 68-72 f, which is fairly moderate temperature and I would consider ideal.

Don't think it's the octane as BMW's programing would kick in to change the timing and fuel ratio but not enough to make it misfire, especially at low RPM's. Additionally, a turbo problem would be more consistent with a a lag rather than a misfire.

Normally, a misfire is caused by 1) spark timing, 2) valve opening timing, 3) vacuum leak, 4) lack of fuel or improper air:fuel ratio, 5) bad alternator or battery i.e., low voltage if it sat for a while and partially discharged the battery, and of course a lot more given the computer controlled nature of the engine. Obviously, you need to have your dealer look at it.





.

[rmorin49]

Could be the infamous HPFP.

[mrboon]

Originally Posted by rmorin49

Could be the infamous HPFP.

dont think that really breaks in europe. we have decent petrol.

[SHADOW4]

Originally Posted by teagueAMX

Shadow, don't know if I'm reading you correctly, but 20 - 22 c converts to 68-72 f, which is fairly moderate temperature and I would consider ideal.

Don't think it's the octane as BMW's programing would kick in to change the timing but not enough to make it misfire, especially at low RPM's. Additionally, a turbo problem would be more consistent with a a lag rather than a misfire.

Normally, a misfire is caused by 1) spark timing, 2) valve opening timing, 3) vacuum leak, 4) lack of fuel or improper air:fuel ratio, 5) bad alternator or battery i.e., low voltage if it sat for a while and partially discharged the battery, and of course a lot more given the computer controlled nature of the engine. Obviously, you need to have your dealer look at it.

Yes, i will add it to my list. I still have to go back for a "real" delivery" with a technician to answer a few questions. I think like you, perfect storingtemperature, best fuel you can buy in Sweden. and never misfires except for this conditions.

Originally Posted by rmorin49

Could be the infamous HPFP.

NOPE! I refuse! They have to have this fixed on a march-april 2010 build!

Originally Posted by godius

dont think that really breaks in europe. we have decent petrol.

For your info: My exhaust "pops" every time in "Manual" from 3000rpm and up. Never been above 5000rpm.
Normal, sport and sport+ !!! I know you had a post about pops sometime ago.

Still in breake in with 500 km so far.

[zEdP]

Originally Posted by SHADOW4

Feels like you have to turn the steeringwheel 2-3 cm before the car listen to your commands, In norm, sport and sport+.

This is the same story like the softer suspension. BMW has designed the car 'softer' in comparison with it the E85. This involves also the steering. Some will like it because it feels less nervous. Like you, I don't like it either, especially the vague center feeling in normal and sport mode (sport+ is definitely better). Also the steering gearbox ratio, unfortunately BMW did not use the ratio of the E85.

Other than that it's a superlative vehicle!

The total package is perfect!


About the cold start misfiring. I drive for more than 12 years BMW and so now and then, in various conditions, the cars I owned had some problems with this issue. I suspect humidity within the engine system could be the problem in the first seconds of a cold start.

EdP

[SHADOW4]

Originally Posted by zEdP

This is the same story like the softer suspension. BMW has designed the car 'softer' in comparison with it the E85. This involves also the steering. Some will like it because it feels less nervous. Like you, I don't like it either, especially the vague center feeling in normal and sport mode (sport+ is definitely better).

EdP

Software fix?

[zEdP]

Originally Posted by SHADOW4

Software fix?

Software could fix the vague center feeling just by reducing the electric assistance.

Originally Posted by SHADOW4
Feels like you have to turn the steeringwheel 2-3 cm before the car listen to your commands, In norm, sport and sport+.

This is a mechanical issue.

EdP

[teagueAMX]

Originally Posted by zEdP

About the cold start misfiring. I drive for more than 12 years BMW and so now and then, in various conditions, the cars I owned had some problems with this issue. I suspect humidity within the engine system could be the problem in the first seconds of a cold start.

EdP

I agree w/ EdP, this could be something as simple as BMW VANOS warming up a little bit. People often complain that it's noisy when you first start the car, which is a combination of all the machine tolerances being very loose when the engine is cold. The misfire you observe could be a product of that process.

Originally Posted by SHADOW4

They have to have this fixed on a march-april 2010 build!

I'm curious about this deadline. Please explain.

Originally Posted by SHADOW4

For your info: My exhaust "pops" every time in "Manual" from 3000rpm and up. Never been above 5000rpm.
Normal, sport and sport+ !!! I know you had a post about pops sometime ago.

The popping is a product of BMW playing around with the "fly-by-wire" throttle position software setting to give a nice effect at each shift, and sometimes that results in a very small amount of unspent fuel coming out the exhaust pipe. The fuel is still hot and it ignites when it hits the fresh air, making a "pop".

[SHADOW4]

[QUOTE=teagueAMX;7310263]



I'm curious about this deadline. Please explain.



QUOTE]

Just my wish!

[Memphis1]

Originally Posted by godius

dont think that really breaks in europe. we have decent petrol.

we've been over this, it's not the gasoline...

[teagueAMX]

+1

[SHADOW4]

Originally Posted by teagueAMX

The popping is a product of BMW playing around with the "fly-by-wire" throttle position software setting to give a nice effect at each shift, and sometimes that results in a very small amount of unspent fuel coming out the exhaust pipe. The fuel is still hot and it ignites when it hits the fresh air, making a "pop".

And the unburned fuel is also for cooling, wich i think is the primary. Not only a "nice" effect.

[teagueAMX]

Originally Posted by SHADOW4

And the unburned fuel is also for cooling, wich i think is the primary. Not only a "nice" effect.

What are they cooling?

[zEdP]

Originally Posted by teagueAMX

The popping is a product of BMW playing around with the "fly-by-wire" throttle position software setting to give a nice effect at each shift, and sometimes that results in a very small amount of unspent fuel coming out the exhaust pipe. The fuel is still hot and it ignites when it hits the fresh air, making a "pop".

Unburned fuel will destroy the catalyst converters. When a small amount of unburned fuel leaves the engine, caused by an ignition problem, the catalyst converter will burn it. The MCU will try to avoid this.

I'm not sure, but the pop is caused by a very short period of time an under pressure in the exhaust manifolds?

Ed P