545i low RPM stability
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Overall I'm very happy with my '04 545i SMG that I picked up about two weeks ago, but since my car is due for it's vehicle check next week I also wanted to have my SA check out my idle as I don't think it's as smooth as it should be.
During idle I can feel a vibration in the brake pedal and my tach wobbles about +-50 from 700 rpm. I thought it was limited to idle until today while at 2300 I also saw the wobble. Thinking it just may be slight differences in throttle input I set the cruise control and the wobble was still there and further testing showed it didn't go away until a bit above 3k after which the tach is rock solid.
I'm going to assume this is not normal but would like some backup from other owners. My car has a build date of 05/04 which puts it just out of the range for the intermediate lever SIB (though the SIB does say the early date is an approximation) and my symptoms don't match the SIB exactly.
On a possibly related note, my SMG does seem to occasionally shudder on the 3-2 and 2-1 as if it is missing its target when it blips. Upshifting is always smooth when I feather correctly. Since I have such little time with the transmission under my belt I would be shy to report a problem with it.
During idle I can feel a vibration in the brake pedal and my tach wobbles about +-50 from 700 rpm. I thought it was limited to idle until today while at 2300 I also saw the wobble. Thinking it just may be slight differences in throttle input I set the cruise control and the wobble was still there and further testing showed it didn't go away until a bit above 3k after which the tach is rock solid.
I'm going to assume this is not normal but would like some backup from other owners. My car has a build date of 05/04 which puts it just out of the range for the intermediate lever SIB (though the SIB does say the early date is an approximation) and my symptoms don't match the SIB exactly.
On a possibly related note, my SMG does seem to occasionally shudder on the 3-2 and 2-1 as if it is missing its target when it blips. Upshifting is always smooth when I feather correctly. Since I have such little time with the transmission under my belt I would be shy to report a problem with it.
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Originally Posted by sigma' post='459832' date='Aug 17 2007, 02:26 PM
During idle I can feel a vibration in the brake pedal and my tach wobbles about +-50 from 700 rpm.
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My Ride: 2004 545i Titanium Grey w/grey leather and SMG
Past: 1999 540i Titanium Silver w/6sp and Dinan tuned (really cooked!); 1988 735i White; 1986 528e Grey; 1966 2001 White
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Same here - I notice no such vibration as you describe (... loving the SMG)
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Originally Posted by kennedylar' post='459899' date='Aug 18 2007, 12:30 AM
Same here - I notice no such vibration as you describe (... loving the SMG)
I used the hidden menu on the instrument cluster to get some readings today and saw the idle baseline at 745 with a range jumping between 725 and 765 so the spread is not as severe as I originally estimated but still feels wrong, especially with the vibrations.
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There have been some posts about the varying RPMs I have a slight case of that but I have no vibrations.
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Originally Posted by Iceman' post='460131' date='Aug 19 2007, 07:05 AM
Next time your car is in service let them check the crankcase ventilation. Could be causing such trouble...
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My Ride: 2004 545i - 6 speed manual (July 04 build), silver-grey/black, sports package std equipment (18", active roll, active steering, adaptive headlights), premium sound, bluetooth enabled, folding rear seat, lumbar, 3m hood/bumper protective film, rear tint, euro reflectors.
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It is hard to describe these type of situations. I had been through a long process with my 545i manual which turned out to be normal engine harmonics. I think they appeared around 1200 rpm and 1800-2300 rpm (don't remember). the vibration was very slight and could be detected by watching an open door at rest. The vibrations where not noticed while driving.
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Well, the car is back in my hands after more than a week in the shop with a "could not duplicate" result. I did get have the latest progman, up from 16-19 or so but it made no difference.
After spending 5 minutes with the tech in the car he did finally acknowledge the problem existed but couldn't even speculate as to what's wrong, just saying he will run more tests when my backordered door seals arrive. Should I gently suggest a new PUMA case to him?
After spending 5 minutes with the tech in the car he did finally acknowledge the problem existed but couldn't even speculate as to what's wrong, just saying he will run more tests when my backordered door seals arrive. Should I gently suggest a new PUMA case to him?
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