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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 09-13-2003, 10:51 PM   #1 (permalink)
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Hi All...

I need a favor please. If you would please run this little test on your car and let me know what happens. I don't know if it only applies to the e39, the v8's or all BMW's.

On my 2000 540i, with the engine running in "Park", if I step on the accelerator and bring the rpm up slowly, anywhere from idling to under 2000rpm, the engine will kinda "stumble" slightly (like rough idling). I was told by the mechanic that this is normal when the engine is running without load.

Ever since I replaced the Throttle body and the Mass Airflow sensor, the engine runs good and the idling is super smooth without missing a beat. I just find it hard to accept or believe that it is normal for the engine to stumble when running in between idling and 2000rpm without load. I tried this same procedure on my Isuzu Axiom and it runs smooth. I remember doing the same thing to my previous Mazda 626 and it ran smooth.

So...if you all would please try this out on your cars and let me know if they behave the same way, I would be able to sleep better.

Thank you!
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Old 09-14-2003, 12:22 PM   #2 (permalink)
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there was/is a software update we were doing at the dealer for this type of problem. this is what dmw considered the fix. Most of the time it worked, sometimes it didn't. My personal opinion is that the programming was compatible with most mass air sensors, but some it wasn't. you must have replaced your old mass air with one that is compatible (sounds weird I know, but there are differences). I think bmw realized that the cheapest fix for them was the updated programming. I started just replacing mass air sensors and writing up my diagnosis to support it. That way BMW would pay for it (if still under warranty) and the customer was happy.
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Old 09-14-2003, 05:07 PM   #3 (permalink)
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No stumbling here..smooth as smooth can get!! '94 325is 62k..
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