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  #11  
Old 28-07-2008, 07:32 PM
SimonClark SimonClark is offline
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Ok, so done a few more miles and my observations are:-

1. When cold the hesitation can be anywhere from tick over to 2500rpm and worse at more throttle - not sure about full throttle as don't use it from cold.

2. When it's warm it's pretty smooth but can be hesitant between 1500 - 1800 rpm and it's worse if the car has been driven hard through the revs beforehand - like it's adjusted for harder driven and then confused when you are lower in the revs. It's also at its worse at 3/4 throttle in this situation and could be described as a mild kangaroo effect.

Not sure that it would be bad enough for a dealer to spot as I didn't notice it for the first few miles.

Anyother thoughts?
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  #12  
Old 28-07-2008, 07:39 PM
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Are you letting the clutch out properly?
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  #13  
Old 29-07-2008, 07:13 AM
SimonClark SimonClark is offline
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I am letting the clutch out.
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  #14  
Old 29-07-2008, 07:24 AM
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h4pry h4pry is offline
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Quote:
Originally Posted by exdos View Post
Are you letting the clutch out properly?

LOL.

Nice one Exdos.
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  #15  
Old 01-08-2008, 07:50 PM
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Rags, start and drive off gently.

Guys, this is a 6 pot well balanced engine. All should be smooth. If its not, somethings wrong.
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  #16  
Old 14-08-2008, 02:26 PM
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cragg711220 cragg711220 is offline
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Hi Simon, one thing you can try is resetting the vanos.

After a couple of weeks of 'fuel economy mode' driving to work my engine can sometimes be a bit hesitant at the low revs. This is apparently because the ecu 'learns' your driving stlye and adapts to it.

If you have been driving sedatly for a bit try resetting the vanos by doing the following:

with engine off, turn key to 2nd click (1 before ignition) and stay there for 10+ seconds, then turn key back to off position and wait another 10+ seconds. Then start the engine, usually the idle revs start a bit higher 1500 or so and slowly come down over 5s or so. I have found after doing this it adds a bit of punch to the engine.

There is a thread about it on here somewhere i think.
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  #17  
Old 14-08-2008, 03:46 PM
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wadh0070 wadh0070 is offline
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Quote:
Originally Posted by cragg711220 View Post
Hi Simon, one thing you can try is resetting the vanos.

After a couple of weeks of 'fuel economy mode' driving to work my engine can sometimes be a bit hesitant at the low revs. This is apparently because the ecu 'learns' your driving stlye and adapts to it.

If you have been driving sedatly for a bit try resetting the vanos by doing the following:

with engine off, turn key to 2nd click (1 before ignition) and stay there for 10+ seconds, then turn key back to off position and wait another 10+ seconds. Then start the engine, usually the idle revs start a bit higher 1500 or so and slowly come down over 5s or so. I have found after doing this it adds a bit of punch to the engine.

There is a thread about it on here somewhere i think.
Is this process the same for both S50 and S54?

Jez
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  #18  
Old 14-08-2008, 04:58 PM
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Good point Jez, I'm not sure. I should point out I have an S50.
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  #19  
Old 19-08-2008, 01:12 PM
///Juttla ///Juttla is offline
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This could be what your looking for...

http://www.z3mcoupe.com/forum/showth...esetting+vanos

also found this

http://www.bimmerfest.com/forums/sho...d.php?t=266162

hope it helps....let us know..
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  #20  
Old 19-08-2008, 02:00 PM
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Trundler Trundler is offline
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My car has a v similar fault/stutter.
Left it at my indy last night so that could run the car from cold while plugged into the diagnostics.
It turns out i have a dodgy exhaust gas temp sensor, and this may cause the trouble.
Once its replaced i'll post any significant results.
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Now ... S54: Sapphire Black/Black-Black/HK+6/Cruise/Sun Roof/H~Lamp wash///ACS Road Suspension/Rogue Engineering rear top mounts/Braided clutch hose
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