Erratic throttle response when cold
I'm still trying to get a good feel for what goes on and when, but this is what I've noticed so far - more than once in each case:
1. Driving away from my house when starting the car from cold usually involves reversing out then driving off uphill, a definite hill but not especially steep.
I've noticed the car surging then slowing then surging forward again without me changing the position of my right foot. "Kangaroo petrol" 
(I may have experienced this elsewhere but not 100% sure as I'm usually driving away gently on level ground)
2. Pulling out of a side road and accelerating the car only speeds up "gently" not "urgently" as I expect. No ABS/ESP warnings or symptoms. Only seen within the first minute or so of driving the car and not always by any means.
I haven't yet tried starting it on the drive and gently pressing the accelerator pedal to see if revs vary.
Problem #1 is a bit weird but #2 is potentially quite dangerous.
No codes showing on VCDS. No "slipping" or increased revs, just varying power so I suspect engine-related not gearbox.
It's an FL S8 which I understand is "fly-by-wire" though what the relevant components are and where I don't know.
Suggestions please on possible causes and how to diagnose.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 14th February 2013 at 05:04 PM.
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