My 2007 2.5i seems to have developed a 'lazy' throttle...
When starting it, it'll rev up as normal, but sloooowly comes down to normal idle speed.
It's a manual, and when blipping the throttle on a downward gear change - similar thing - the revs will drop sloooowly - resulting in some kangaroo-like change downs.
Sitting at idle, a gentle quick blip results in the lazy rev slow down, but a hefty lengthy rev results in a normal (ish) response.
Sometimes the revs will sort of 'run away', so I'm worried I've got a throttle with a mind of its own!!
Thoughts? Could it be the pedal, or is it something engine related? I've tried with DSC on and off...
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Weird 'lazy' throttle
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groovy_hippy
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- Joined: Sun Mar 15, 2015 5:37 pm
- Location: Derby
Weird 'lazy' throttle
Current ... 2007 Z4 Coupe 3.0si Sport | Manual | Alpine White | Black leather | Piano black dash
Intro to Zeds, now sold... 2007 Z4 2.5i SE Roadster | Manual | Stratus Grey | Red Leather | CDV delete | DLV backbox
Intro to Zeds, now sold... 2007 Z4 2.5i SE Roadster | Manual | Stratus Grey | Red Leather | CDV delete | DLV backbox
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Smartbear
- Lifer
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- Joined: Wed Feb 05, 2014 6:54 pm
- Location: a barn in Somerset
Weird 'lazy' throttle
Hi, that sounds like engine behaviour related to an intake air leak causing weak running-check your intake hoses & the small elbow that branches off it 
Rob
Rob
e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold
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G-A-R-Y
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- Location: North Bristol
Weird 'lazy' throttle
Perhaps clean and check the ICV (idle control valve). Use a carburettor cleaner and twist/shake vigorously (once removed) to get it moving until you can hear a certain clunking.