Hello,

I'm experiencing an issue whereby my engine speed fluctuates up and down by ~100 RPM under light throttle between 30 and 50 km/h (approximately). The acceleration remains steady when this happens (I don't feel anything strange), and all shifts are very smooth. It doesn't happen under heavy throttle, only light throttle. This is the only symptom; if I didn't look down at the RPM gauge, I wouldn't even know it's happening. It has been like this for a few months.

Anyone know what this could be? My guess would be a transmission issue but, as I said, the shifts are very smooth and there's no slipping or other strange behavior under heavy throttle when I would expect problems to show up, so I don't know...

The car currently has 125,000 km and transmission fluid was changed at 100,000.

Thanks
cinergi

 

What model/year is your car?
I have had something like it at around 70 km when cold only with the 545

 

2006 525i.

 

I suggest that you clean the mass air sensor to eliminate that possibility.

 

Thx will do.

 

Hey buddy,
Did u clean the air flow meter ?
Is it still doing it ?

Please update me as im experiencing the same thing !

 

It stopped doing it by itself, perhaps due to the warmer weather, so I didn't clean the mass air sensor. I will if the problem returns.

-cinergi

 

I had this very issue in my car, It was the transmission, after changing the oil and resetting the transmission in INPA it fixed the issue.

 

I have sort of the same issue, when I took my 04 525i into the local dealer they didn't even come out to look at car, he just told me that from what I am describing its not the tranny, I cleaned my maf and replaced my air filter which greatly helped but the car is still acting funny, I almost thing I need to open it up and check the vanos system, I will record a video of the issue today since symptoms are very hard to describe.

 

This happened exactly the same on my friends 2008 525i
It was low transmission fluid