Car slows down and jerks at high or full throttle?

Saint.V8 said:

Drive with less boot...!!

A stutter can occur due to lack of fuel....the 4.6 engine was fuel mapped very lean to try and help full economy...a sudden wide open throttle event may catch the engine by surprise and falter as it tries to increase the injection opening times to permit more fueling....

A Range Rover isn't a speed machine, but built and tuned for low speed low down torque....you bought the wrong car to be a speedy!

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TSC said:

Thanks for reply, point taken, however, for example, travelling at 50 uphill on dual carriageway and pulling out to overtake, car will kickdown initially but then lose power and slow down backing off the throttle stops the hesitation, I don't think I'm driving it too hard

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wammers said:

Diagnostics is the only way you will find out what's wrong. Without it you could be guessing from now until this time next year.

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TSC said:

Thanks for reply, point taken, however, for example, travelling at 50 uphill on dual carriageway and pulling out to overtake, car will kickdown initially but then lose power and slow down backing off the throttle stops the hesitation, I don't think I'm driving it too hard

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TSC said:

Hello, new to this forum and new RR owner

Recently purchased a 2000 4.6 RR Vogue, very pleased with it except on kickdown or high throttle, if actioned quickly the car judders and slows down, it does kickdown but then hesitates,backing off the throttle improves the situation, at low and medium speeds all is well, slowly increasing speed is ok, no warning messages and auto box changes well at low to medium speeds, it's a pain on hills and overtaking, any advice would be appreciated.

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clivesP38 said:

The 4.6 kicks down at over 85 mph if in sports mode and continues to accelerate to well over the 110 mark, at least mine does! I had your problem on a td5 disco which turned out to be a ??throttle mass sensor??, may have the name wrong but cost less than £500 to fix and was fixed under the warranty. Just trying to say there souldn't be hesitation, when I kickdown at 50mph the RR shoots up to 90 mph in a heartbeat, deffo not a slouch!!

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clivesP38 said:

The 4.6 kicks down at over 85 mph if in sports mode and continues to accelerate to well over the 110 mark, at least mine does! I had your problem on a td5 disco which turned out to be a ??throttle mass sensor??, may have the name wrong but cost less than £500 to fix and was fixed under the warranty. Just trying to say there souldn't be hesitation, when I kickdown at 50mph the RR shoots up to 90 mph in a heartbeat, deffo not a slouch!!

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wammers said:

You were of course in Germany on the Autobahn when you found this out i take it?

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clivesP38 said:

Or on a race track, rolling road ........ ermm, can't think of anywhere else officer where I would have done that speed .

I know the police don't like speeding in this country as when I got stopped for doing 93mph on a motorway I told him he must be mistaken as my cruise was set at 96mph to make sure I didn't get an instance ban (100mph+) :hysterically_laughi , 3 points and £60 fine also taught me he had no sense of humour, his face didn't even crack a smile when I said 'good job you didn't catch me doing 145mph on the bike last week!

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