Idling fast once warm.

[kevtherev]

It moves the dog that is attached to the flap spindle

[JamesKT25]

Okay so i reconnected the loose cable and watched the choke flap open as the engine warmed. All seems ok. Took the van up the road and if i push it to fast through the revs it just stops and then suddenly flies! Park back up at home and the revs are still high. Could it be a blocked jet? The old petrol tank was awfully grubby but there are two filters in the system.

[kevtherev]

When the duct is off...
Engine off
Get an operative to depress the accelerator,
You will be looking inside the throat for a squirt of fuel from the transfer jet, as the pedal is depressed (hold the choke flap open).

If you have a good squirt of fuel then we can move on to the next probability

...and you only need one filter by the tank, what VW intended

[JamesKT25]

I did wonder why there was two... When the engine was idling earlier there looked like dribbles of fuel being injected below the butterfly. Should this be a nice neat fan? As it just looked like a dribble...

[kevtherev]

try not to ping around suspecting stuff..
Be methodical

[JamesKT25]

So looking down the choke flap with the engine off, When the throttle is pressed, there should be a nice clean jet of petrol? What do i NOT want to see?

[kevtherev]

Nothing

[JamesKT25]

Should it be a fine mist of fuel? Or a mass flood? Or does that make no difference?

[kevtherev]

Should it be a fine mist of fuel? Or a mass flood? Or does that make no difference?

a squirt

[JamesKT25]

sorry to sound so thick, i just wanna be sure haha

[JamesKT25]

Right, managed to check it tonight and there is a nice squirt of fuel, took the van out whilst it was cold and there was no problem at all even when i really hammered it (dont normally push it until warm) soon as it warmed up it started to hesitate and idle fast again.

[kevtherev]

OK to me it's now a fuel issue... It seems to me when the mixture is rich (choke on) there is no problem.
Once the choke comes off (around 6 mins) it starts to lean out
A lean mixture will cause a hesitation (Partial stall)
pressing the acc. slowly allows the fuel mixture to be detonated all be it with reduced power.
The only thing to stop me putting money on a small air leak into the inlet side...is the fast idle, as air leaks reduce the idle speed.

I would get the mixture checked, see what the CO, O2 and HC reading is when the engine is warm.