very rough on cold start up
05-11-2006, 10:41 AM
#42
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Originally Posted by EBMCS03' post='280422' date='May 10 2006, 10:18 AM
in the slower 20 to 40 mph what RPM are you running at?
05-11-2006, 11:15 AM
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Originally Posted by wassy' post='281079' date='May 11 2006, 01:41 PM
sorry for delay. looks like at about 35 MPH, I am running at about 1300 +/- RPM>
Edit: I just looked and you have an automatic transmission. When cruising and anticipate the need for speed, keep in in DS mode. When I had my 540iA, I always kept it in DS when driving around town. DS holds lower gear longer. Or, trade your car in for a manual tranny.
05-11-2006, 11:18 AM
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Originally Posted by markt540i' post='281090' date='May 11 2006, 03:15 PM
Downshift. You must be in 3rd gear. I am usually in 2nd when going 35 unless I am just cruising and don't want power and want to conserve fuel. I do not like to get below 2,000 rpm and for maximum power/acceleration, down shift to where you are in the 3,500 to 4,000 rpm range when you want to hit the go petal. At that RPM, you will find there is no delay in power delivery, but a throw you in the back of the seat rush of acceleration.
Edit: I just looked and you have an automatic transmission. When cruising and anticipate the need for speed, keep in in DS mode. When I had my 540iA, I always kept it in DS when driving around town. DS holds lower gear longer. Or, trade your car in for a manual tranny.
Edit: I just looked and you have an automatic transmission. When cruising and anticipate the need for speed, keep in in DS mode. When I had my 540iA, I always kept it in DS when driving around town. DS holds lower gear longer. Or, trade your car in for a manual tranny.
05-11-2006, 11:22 AM
#45
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My Ride: 545iSMGSilver GrayAuburn Dakota LeatherLogic 7 Premium SoundSports Package
I'm going to suggest my weirdo test again...
rev the car slowly in neutral. and kinda hold it at 1100 rpm and hold it at 1300 rpms and see how smooth or rough the engine is.
rev the car slowly in neutral. and kinda hold it at 1100 rpm and hold it at 1300 rpms and see how smooth or rough the engine is.
05-11-2006, 11:23 AM
#46
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Originally Posted by kirkB' post='278484' date='May 5 2006, 10:41 AM
Our new 550 runs very rough on cold start up each morning (not that cold - located in So Cal). It is not like a higher idle - it is stumbling all over itself and sounds very sick. Once it has been driven - it runs excellent.
Went to dealer- they reprogrammed - and it is still doing that.
Anyone else experience this?
Kirk
Went to dealer- they reprogrammed - and it is still doing that.
Anyone else experience this?
Kirk
Problem was solved though, no more rough idle.
05-11-2006, 11:49 AM
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Originally Posted by wassy' post='279957' date='May 9 2006, 12:47 PM
OK boys and girls. spent some time with the regional people at BMW today. THey are WELL aware of the rough idle when first starting the 550i. I don't remember the specific technical jargon, but basically it boils down to this: The car runs very lean. this is how they can get better MPG for you and the EPA. Since startup consumes a large amount of gasoline, this is where the biggest savings come from. Once warm, about 30-40 seconds after starting, the roughness goes away.
Bottom line - nothing can be done about it.
However, in my case, I seem to also bogg down at traffic lights .. this seems unrelated.
anyone else?
Bottom line - nothing can be done about it.
However, in my case, I seem to also bogg down at traffic lights .. this seems unrelated.
anyone else?
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