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E39 M5 (1998-2003)

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Old 06-04-2005, 07:34 AM
perrotpx perrotpx is offline
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Mein Auto: M5 E39 - 1999
Question Acceleration issue

Hi, I am brand new in the BMW M5 world. I just acquired a mint M5 from 1999. It has only 45,000kms and was parked most of the time in a garage (the previous owner was a pilot for Gulf Air airline).

I checked the whole car through the local dealer and even did a main maintenance to be sure everything was ok on the car. They confirmed that the car was fine. However, I have one concern:

The acceleration is not frank and have little "holes" during smooth acceleration. Also, if I accelerate full throttle, I feel that the car does not give all the power it has. For instance, sometime, just by releasing the accelerator a little bit, more power is being delivered for a couple of second.

All filters have been changed, as well as all the spark plugs.

Does anyone have felt the same thing on their M5? I would really appreciate your help!

Thanks in advance to all of you!

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Old 06-04-2005, 01:14 PM
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KevinM KevinM is offline
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That is definately NOT normal.

I'm not much of a mechanic, but perhaps your clutch is slipping...

Good luck!

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Old 06-05-2005, 10:28 AM
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Old 06-06-2005, 05:00 PM
CE CE is offline
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Acceleration issues

Hey man...I'm new at this deal too having just bought a used 2000 M5. I have similar issues and suspect it is something electrical in may case as the same hessitation/irregularity can be felt/heard in neutral. IF you rev the engine slowly and detect no variability in response, it's likely the clutch...otherwise electrical in nature...just my 2 cents. Mine appears to be "missing" a bit...especially when first driven (prior to warm-up). Nobody else noticed this but me. When I get resolution, I'll post an update. Good luck.

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Old 06-21-2005, 11:58 AM
polshrk polshrk is offline
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Mein Auto: 00' BMW M5
accel issues

It is your MAF. All the MY99 and MY00 had some issues with the Mass Air. See if you can get BMW to replace them for free or a small fee. If you remove them and clean them really good you might feel a difference, but best bet is to replace them.

goto and search for MAF and you will find tons of info.

hope this helps

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Old 06-27-2005, 10:10 PM
EuroRocket EuroRocket is offline
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sounds like to me the clutch slipping.. but the MAF is a output sensor so even when u start the car, u might have problems.
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