Jerky throttle

[Tyre Tread]

The throttle pedal on my car has become jerky.

If I remove all 3 springs it will move smoothly but even one spring makes it jerky.

I am assuming there's a bush in the throttle body which may be worn such that when a tension is put on it, it sticks?

Any advice appreciated

[steviegtr]

I would in the 1st instance try getting some lube in the cable or change it. Mine is a bit like that. Not had a look yet.
|Steve.

[Tyre Tread]

Thatnks Stevie but it's definitely not the cable as it's new, has been covered (internally) in graphite and the pedal moves smoothly without the springs in place.

[Belle427]

There were 2 springs as normal on most mechanisms, people used to remove 1 to lighten the throttle feel.
There are some spindle bushes in there that do wear but it be looking at the closed stop first to see if its not been messed with allowing the throttle blade to close too much and bind.
Make sure its all nice and clean too.

[BritishTvr450]

Belle427 said:

There were 2 springs as normal on most mechanisms, people used to remove 1 to lighten the throttle feel.
There are some spindle bushes in there that do wear but it be looking at the closed stop first to see if its not been messed with allowing the throttle blade to close too much and bind.
Make sure its all nice and clean too.

Sounds like the area to be looking at.

I remember that trend of removing one spring which I thought might be a bit risky if the only remaining one snapped so simply put a less springy spring in place of one of them so retaining two springs for safety but having a softer pedal.

Maybe also look at the pedal pivot point which might be binding slightly when more tension is placed on it.

[Loubaruch]

Removing one spring definitely risky, some may remember Colin Blower in his Tuscan racer hurtling into the Armco when his throttle jammed on, fortunately Colin escaped serious injury.

[Tyre Tread]

As standard there are actually 3 springs. A rotary one and 2 linear springs.
If I remove the 2 linear springs it's still jerky and not just off the throttle stop but all the way through it's travel.
If I remove all 3 springs it's really light but smooth action which would suggest to me that the issue lies in the bushes that the throttle spindle runs in.

The car in in the body shop for some paint repair this week but I hope to get it back next weekend so I can continue my investigation.

[Belle427]

The rotary one is oem but im not sure about the other 2, they are return springs to safeguard the throttle jamming open as suggested but i dont know if the original Range Rover had them.