I have a replacement throttle pedal sensor on hand, awaiting fitment.
It's been on hold until the catalyst was sorted in case that changed symptoms - it hasn't.
I've tested the throttle position readings several times with VCDS and it's always appeared perfect.
The intriguing thing is that, as explained above, if you are on cruise you can override speed upwards by pressing on the loud pedal, which is why I did the test today. Basically the pedal was already pressed a lot but the car was acting as if it was only slightly down, which is the main part of the problem. As soon as I "set" cruise (without moving my right foot) it acted as if the pedal really was where it was and shot off!
So effectively, turning on the cruise control, or more precisely "setting" it, cancelled the problem and restored "normal service". Lifting my right foot then putting it down again does the same, but less violently.
I'm trying to understand what this "reset" effect from setting the cruise tells us about the problem.
It does suggest to me that the pedal sensor is OK, but that the signal from it is being processed incorrectly - a software problem?
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant.
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".  (Even rarer than a D2 S8!) 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. Agate Grey/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. Added Auto-dim mirror, Leather seats, 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; 6th March 2015 at 08:34 PM.
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