swajames

My 545 is booked in with my dealer this week for them to look at a couple of things, firstly when the car is in DS and held on the brake at a stoplight I can feel a pulsing vibration (sometimes quite pronounced, sometimes only a little) which almost makes the car seem to shake a little. The other thing is that sometimes the car doesn't seem to want to upshift in DS mode, when I apply the gas it sometimes pulls away and sticks in (I think second) way beyond the normal 3000 to 4000 rpm shift point even when I only apply light pressure to the pedal and when it does that even if I ease off the gas (and I'm not talking about much pressure to begin with here) it still doesn't upshift.

Anyone else had this and if so how was it fixed? I'm guessing its software but I'd be interested to hear if this is something anyone else has had so I can discuss it with the SA (trying to avoid the "could not reproduce"!!)

Thanks

andy545

When my engine is cold and I'm waiting at a traffic light, the engine idles at 750 rpm ( 500 normal ) - so a touch more vibe......warm : smooth as usual.

"no upshift" occurs sometimes with me under the following situation:

relaxed driving followed by a short burst of spirited driving in DS, then stop at
a traffic light followed by normal relaxed driving in auto. At this point, 2nd stays engaged up to 3000-3500 with only slight pressure on the gas. IMO, normal, as the gearbox was maybe expecting some more spirited driving ( even in D ) -
On the next traffic light, D behaves normal again.

This behaviour, I have consistently noticed and have come to expect.
Don't forget it's adaptive.

Iceman

Yep.

swajames

Yep.
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Understood, but even an adaptive transmission should not want to rev to the redline unless the driver is giving the loud pedal some "special treatment".... I'm talking about fairly low speed driving here with light throttle pressure, examples being pulling away from a stoplight at low-ish speed (when I do give the pedal some welly it works fine by the way, it's only low speed driving that is the issue) or when I turn into my street for the last half mile home or so. Maybe the answer to my own question is just to keep the right foot planted to the floor at all times as it works great then....

uwsc11

Yep.
[/quote]

Understood, but even an adaptive transmission should not want to rev to the redline unless the driver is giving the loud pedal some "special treatment".... I'm talking about fairly low speed driving here with light throttle pressure, examples being pulling away from a stoplight at low-ish speed (when I do give the pedal some welly it works fine by the way, it's only low speed driving that is the issue) or when I turn into my street for the last half mile home or so. Maybe the answer to my own question is just to keep the right foot planted to the floor at all times as it works great then....
[/quote]

I was just going to say: "What are you doing?" "Slow speed driving?" "The car is not meant for that". The car wants and expects pedal to the metal.

kscarrol

I had a similar response from my 2004 545 when I first took delivery. For the first several months the engine would rev what I thought was abnormally high under "normal" (read NOT spirited!) acceleration in DS. It did settle down eventually, I assume as part of the learning process of the adaptive transmission and now seems to be fine. Shifts now take place at roughly 3,500 RPM in DS though like swajames, there were times early on where it would not shift out of 2nd until 4,500 or even 5,000 RPM. Not sure has adapted more, me or the car! Give it a little time before rushing to the dealer. Remeber that the computer will kick in and shift before there is any damage done.

Canada545

Doesn't this make it difficult to "break-in" the engine if the transmission doesn't want to change gears until high RPM's?

kscarrol

It can, yes. I had to be careful driving in DS during the break-in period as I could easily hit or exceed 4,500 RPM if I punched the gas pedal. This has been discussed in other threads, that it is quite easy to hit the level of RPM's (using DS) that the manual warns about for the break-in period. As for breaking in the engine, I drove very occasionally in DS to hit some higher RPM's but mostly in D, where if pushed would still get the RPM's up a good bit...