Hi, I am new here and Iwas wondering if anyone can help please.. I have a 2009 bmw 730d auto on 92k miles.

Just noticed when the car is driven on a cold start, for the first 5 minutes or so when accelerating the rev gauge goes up as it should, and the auto box changes gears as normal.

However, when I take foot off the accelerator the rev gauge comes fully down as though the car is stationary in idle.

After 5 minutes driving the rev gauge remains higher as it should going through the auto gears.

When the rev gauge comes down, the car still drives fine, doesn't stall, no error messages.

Is it normal for rev gauge to come down to idle, when you take foot off accelerator, for the first 5 minutes of driving in cold.

When the car is warm the rev gauge stays where is should higher than idle.

You can see from screenshot I am nearly doing 25 mph, my foot is off accelerator, the rev gauge is on idle (under 1) when in fact when the car is warm and driving at 25mpg the rev gauge is at 1 and half. Many thanks

Morning Arfan

Welcome to the Forum

Some questions, 1. if you rev the engine what happens ? 2. how many miles has the car covered ? 3. when was the gearbox serviced ?

It could be that the box is holding a higher gear so a 25mph is showing idle speed as the box warms up it changes. A Diagnostic scan would help understand what's happening

Dave

Good afternoon

When the engine revs the rev counter goes up as normal.

Car has covered 92k miles.

Gearbox has not been serviced I did ask my BMW specialist, who is brilliant, he said gearbox oil lasts lifetime of the car.

The car revs only come down for the first 4 to 5 mins of driving in cold. No error messages and car drives fine.

Once warm revs hold as they should.

Would diagnostics probably show anything or anything linked to gearbox?

Thanks

Afternoon Arfan

The gearbox should be serviced between 60k to 100k kilometers according to ZF who make the box. It may be that as your box has not been serviced that when the Gearbox is cold it is sluggish on down changes (25mph would be 1st/2nd gear territory) in higher gears engine revs would hardly register

A diagnostic scan will tell if there are any Fault Codes stored for the gearbox, peace of mind

Dave

Thank you Dave, I have booked in for a diagnostics in couple of weeks time, will see if there is any thing shown linked to gearbox 👍

Hi Arfan

If there are no drive train Faults recorded it is very likely just the gearbox being sluggish when cold

Dave