Pierburg 2e3 - no fast idle

[kevtherev]

does the flap open OK when you rev the engine?

I haven't checked if the flap opens when i rev the engine.

that will tell you if the pull down is working

Theres a 3mm gap with the engine off at the moment. So it should be completely shut when the engine is off then?

I don't think that matters, as the pull down unit will open it to 3mm once the vacuum builds soon after starting,
with the engine running you should not be able to close the flap though (another sign that the pull down is shagged

[Zebedee]

This is how far the choke housing needed turning to get the fast idle cam anywhere near where it should be.


Its as far round as it will go.

But it still isn't far enough round to get the fast idle adjuster on the highest step.

Choke flap is now closed nearly all the way (about a 1mm gap now instead of 3mm) with the engine off.


At that setting from cold the engine idles at about 1700revs. Once warmed up its got a nice 900-950 idle on petrol and a shade more on gas.

[kevtherev]

OK
here's a spare carb I got and I took some pics..


see the metal arm that pushes the cam?... it's can be moved slightly to adjust


full travel of the dog in the housing, this pushes the stop 2mm onto the cam


The bi metal spring at rest in a perfect place.


Spring adjustment, undo the screw and turn the shaft... I tried to do this but the screw sheared

You may be able to wind the spring up and tighten it enough to move the cam

[Zebedee]

Cheers, I'll have another look and see.

[Zebedee]

It only needs to move maybe another 2 or 3mm to get onto the highest step.