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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 04-17-2015, 11:13 AM
cmruws cmruws is offline
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Location: Texas
 
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Posts: 102
Mein Auto: 1999 540i
Bad throttle response from standing start. '99 540i.

Recently I have noticed that when the accelerator is floored from a standing start the engine hesitates a split second. It is similar to a car with a bad accelerator pump in the carburetor. It does this in drive, sport mode, neutral and park. If the engine is above idle speed it doesn’t have a delay (such as flooring the accelerator pedal on the highway). This started a couple of weeks ago. Prior to this the throttle response was fine.

The car is not throwing any engine codes and I have cleaned the MAF wire with CRC spray and checked for vacuum leaks. Anything else I should try?
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  #2  
Old 04-17-2015, 04:15 PM
wpg.Lawson wpg.Lawson is offline
Lawson
Location: Winnipeg
 
Join Date: Jan 2013
Posts: 91
Mein Auto: 2001 540i-m
U jus floor ur car like that, adios to ur tranny
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  #3  
Old 04-17-2015, 09:03 PM
edjack edjack is offline
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Mein Auto: '97 540i 6 speed
Any codes? There have been failures in the electronic throttle control, either the pedal, or the throttle body.
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  #4  
Old 04-18-2015, 05:09 AM
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540iman 540iman is offline
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Location: N.W. Indiana
 
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Posts: 1,675
Mein Auto: 2002 540i sport
Is your DSC turned off? If wheels start to break loose, the DSC light will come on and it will attempt to keep rear wheels from spinning so it can feel like a bad hesitation. Just verify DSC is "off"

Not to "hi-jack" your thread, but I have opposite problem. My 2002 540ia surges when you apply gas from standing stop. I have to apply gas very cautiously or car will "leap" forward. It is an awesome feeling of power (esp. to those who drive my car for first time), but is also wasteful and too touchy of the drive by wire system. I had a 2000 540ia and this 2002 540ia and I would say both cars were evenly matched as far as 1/4 mile times or seat of pants feel, The 2002 just is far too touchy at take-off and it very often "squeaks" the rear tires when taking off making me look like a kid showing off. Is there a simple way to soften the take-off?
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  #5  
Old 04-18-2015, 06:13 AM
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sixpot_simon sixpot_simon is offline
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Location: Australia
 
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Mein Auto: E39 530i
cmruws, if the idle is fine, my guess is the vanos seals are the problem.
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  #6  
Old 04-18-2015, 06:22 AM
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johnstern johnstern is offline
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Location: Cape Neddick, Maine
 
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Mein Auto: 2000 BMW 528iT/5, S/C
Quote:
Originally Posted by cmruws View Post
The car is not throwing any engine codes and I have cleaned the MAF wire with CRC spray and checked for vacuum leaks. Anything else I should try?
How did you check for vacuum leaks? A proper smoke test is the only way to accurately check for such leaks.

You could also use a scan tool to observe live data. Short and long term fuel trims would tell you how the engine is running. Also observing O2 sensor voltage would tell you if the upstream O2s were generating the proper sine wave pattern (bell curve). You could also use the scan tool to look for pending codes.

Last edited by johnstern; 04-18-2015 at 06:28 AM.
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Old 04-18-2015, 04:47 PM
cmruws cmruws is offline
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Mein Auto: 1999 540i
I'll have a smoke test done. I also put techron fuel system cleaner in.

No codes being thrown. Would a small vacuum leake cause the issue?
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  #8  
Old 04-18-2015, 05:40 PM
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johnstern johnstern is offline
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Location: Cape Neddick, Maine
 
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Mein Auto: 2000 BMW 528iT/5, S/C
Quote:
Originally Posted by cmruws View Post
I'll have a smoke test done. I also put techron fuel system cleaner in.

No codes being thrown. Would a small vacuum leake cause the issue?
Yes, it could IMO.
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