Accelerator/ throttle very notchy

[symbol_soup]

Hi all,

I've got a T25 1.9 DG that has an issue with the throttle. When I put my foot on the accelerator there is no movement in it until you build up a fair amount of pressure. Then it suddenly release and you're at a silly amount of revs.

This makes any manoeuvre from standstill an absolute nightmare as it's jerky as hell getting going.

The pedal assembly looks to be fine.

I took it to a classics garage near where I picked the van up from and he said the carbs were dual sprung and they could be a little on the aggressive side. It's almost undrivable. You're either revving the nuts off it, or stalling as you've not reach a sensible level of revs. Before I get it checked into my local garage I wondered if anyone had any advice / things to try?

The best way I have of describing it is this. If you imagine a spring attached to heavy ball and you pull the spring. It stretches until you reach the point where the ball starts to move. Then the ball gains momentum quickly in the direction you're pulling.

[BarnyE]

Try lubricating the cable. A little bit oil on both ends and work the cable in and out. The front can be a bit tricky to get to but if you take the indicator off you can get in there.

I had very similar, lubricating it helped, but replacing the cable with a new one made a world of difference.


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[Rik]

If you manipulate the throttle in the engine bay, is it smooth?

If so, it is not at your engine/carbs. Indeed likely to be the cable. You could visually check the cable to see if it is kinked or the sheath is damaged etc

[symbol_soup]

Thanks both, I'll give those a shot tomorrow and report back.

[cobblers]

you say "carbs" rather than carb....
If your van has had a pair of big carbs (webers?) fitted, those will impact driveability - especially if not tuned perfectly. It sounds as though a stiff throttle pedal is part of the issue, but poor part throttle manners is probably what is really causing the irritation.

[symbol_soup]

It was a typo re: carbs.  

I've just had a good look around underneath and it def looks like the cable.  The protective plastic cover that should cover the assembly underneath is also missing, so there's lot of old grease / grunge built up. The gromet is also missing so parts of the cable have been exposed.  Whoever looked at it last also didn't route the cable correctly.  So I think all of those things combined mean a new assembly, cable and conduit kit are in order.  

 It looks like the protective plastic covers are hard to find so I'll see if I can get one 3d printed.
 

[silverbullet]

Pedal cover is a LHD thing only, impossible to fit to a RHD. The chassis outrigger does a pretty good job of deflecting any road spray.
Front wheels on ramps, drop the clamshell, get comfortable and start swearing.