SOLVED: yet another hesitant misbehaving engine

[ghost123uk]

Might be worth mentioning this to Simon so he can add to the page that you need to re-use their old restrictor. I can see folks omitting it and having "flappy pulldown" issues

[Cruz]

OK
I see that
I bought a BW one and presumed it came inside the pipe from VW

nice one

I cannot guarantee the heritage picture is right as they get their units from the same place............classic

[Cruz]

Also

Just an update that the engine is no longer a hesitating one. As suggested, an I suspected, it was electrical and changing the rotor arm has solved the problem. Though the broken pulldown is making morning starts a bit rough on petrol but LPG is fine with it.

[kevtherev]

It is almost impossible to diagnose a cure for an issue like hesitation.
most of us trot out the usual suspects.
If the OP has done some basic work...sometimes the scatter gun answer gets lucky.

How does rotor arm wear cause hesitation?

[ghost123uk]

I don't know, but when we were touring in France we had a slight hesitation, a bit of a "flat spot" when gently accelerating. After I had inspected the thin vac pipes and and checked the servo pipe = all ok. I fitted a spare rotor arm I had and the problem went away. That was just a shot in the dark / guess really.

[Cruz]

It is almost impossible to diagnose a cure for an issue like hesitation.
most of us trot out the usual suspects.
If the OP has done some basic work...sometimes the scatter gun answer gets lucky.

How does rotor arm wear cause hesitation?

It was more like it was 'missing' or as ghost says 'flat spots' which made me think it was electrical as LPG is a bit more 'delicate' to ignition issues, though petrol suffered too. It's been fine since

Solution was electrical on the ignition side: I had changed the worn rotor arm for a new Beru on,e as well as the plugs and the air filter. It was the new rotor arm that was at fault. The arc on the rotor arm wasn't true and had a flat section on it which caused the 'missing' and hesitation. Since replacing the rotor arm for another new one (checked the quality of it before fitting) the van has run fine. I also replaced a perished gasket on one of the exhaust manifolds too.

[Cruz]

New pulldown unit and length if vacuum pipe arrived today

No restrictor on the unit though which I find strange if it's so important and not listed as a separate part

Unit in action

http://www.youtube.com/watch?v=QkW6GPLx ... e=youtu.be" onclick="window.open(this.href);return false;

[itchyfeet]

Thats how it works without the restrictor, sudden jerky movement, much smoother with the restrictor, try pinching the pipe with a cable tie probably do a silimar job

[Cruz]

I have a restrictor on my old unit. Was just testing it out of the box.

Strange though how they are supplied without? If you don't have a restrictor they are not fit for purpose

[Cruz]

Fitted the pulldown unit yesterday. Simple fit if you remove the choke unit.

The restrictor did smooth out the operation of the pulldown but I still cannot fathom why they are shipped without restrictors and the restrictor isn't a sperate identifiable part??

If Kev hadn't said I would have thrown the old pipe (that had the restrictor stuck in it rather than it being pushed snugly into the inlet hole on the unit)