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E63 / E64 6 Series (2003 - 2013)
The E63/E64 BMW 6 Series builds on BMW's sporty heritage with aggressive lines and an incredible motor to back the design up. Available in coupe and convertible trims with a standard 4.8 liter engine producing 360 horsepower and 360 lb-ft of torque, the 6-series is a popular choice that exceeds expectations.

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  #1  
Old 08-21-2010, 02:20 PM
stev3gra stev3gra is offline
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Location: Charleston, WV
 
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Mein Auto: 645 ci covertible
Question 645 Sputtering at low speed and rpms

I have a 2005 645ci 40k miles. Has anyone experienced sputtering and hesitation at lower rpms? It almost feels like a backfire. And at times it happens at regular intervals like its a misfire. Dealer didn't find anything when hooked up to their computer. Idol seems smooth.

THX
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  #2  
Old 08-21-2010, 04:32 PM
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Giantsfan82 Giantsfan82 is offline
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Mein Auto: 2005 BMW 645CI
Yeah my car does the same thing... It's intermittent for me though, so when I took it to the dealer they weren't able to duplicate the issue. If stomp on the gas a little bit it goes away. Try it. I don't think you have too much to worry about.
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Old 08-21-2010, 04:57 PM
stev3gra stev3gra is offline
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Yea it comes and goes. One day it does it. The next it is fine.
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Old 08-21-2010, 09:38 PM
docpaulo docpaulo is offline
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bad fuel? just a guess...

try having the injectors cleaned... that may help... I think somebody here just did...
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Old 08-22-2010, 06:53 AM
Pixl Pixl is offline
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Fuel injector cleanse, try it. Do two tankful treatments in a row. Consider having a professional fuel injection cleanse done. If that doesn't work, a bad injector may be likely. These engines should not hesitate.
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Old 08-22-2010, 08:20 AM
spat spat is offline
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Ive got the same problem on my 2005 645cic. Ony 11,000 miles. I think it is bad fuel or need injector cleaned.
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Old 08-22-2010, 09:13 AM
stev3gra stev3gra is offline
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Great, I'll give that a try. Thanks for the help.
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  #8  
Old 08-22-2010, 09:46 AM
Jasonau01 Jasonau01 is offline
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Mein Auto: BMW 645ci
I hv the same problem.
Mine at 60km/hr @1300-1500rpm

It kinda ease the problem with the air con on.

Does it solve your problem after the fuel injector cleaned??

Can I use something like the spitfire that pours into the fuel tank???
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Old 08-22-2010, 11:07 AM
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645/333 645/333 is offline
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Additives

Hi
Most of the additives are rubbish, but there is one which is used by some major prestige cars on their service and it is GK44 which is readily available in the US. I have used this in my car and is brilliant, not cheap to buy but worth it every 15-20K miles to keep the fuel system clean
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645, back pressure, hesitation, misfire, sputter


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