pierburg carb choke issue

[bugsteve]

hello all, can anyone advise on issue i am having... the mechanical side of the choke is working fine, butterfly closes when cold and opens when hot but from cold the revs do not rise to keep engine running.. I had carb rebuilt by bromyard sometime ago and everything was fine for a time. Ive since had it apart and checked everything.. all looks well regarding the springs and the general mechanism but problem persists. can anyone tell what the wire to the choke does and what voltages i should be looking for as maybe this is the issue?

thanks for reading

[kevtherev]

The fast idle mechanism is not electrical
you can adjust the fast idle mechanism.
when you start the van are you depressing the acc once fully before cranking with your foot off?

When you checked it did you operate the throttle and see the stepped cam turn?

[bugsteve]

yep.. always actuate choke before start.. will not start unless give some gas and will not tick over till warm.. stepped gear is making contact ok.. i operated carb on the bench and inspected... all seemed well.

[MidLifeCrisis]

Is the choke pulldown working correctly?

[bugsteve]

yes all vac jobbies working... but that is not for cold start on idle.. that is for when you put your foot down when cold.. it pulls off the choke to give better acceleration

[kevtherev]

Ok so the cam operates, you can undo the three screws and turn the autochoke housing clockwise about 5mm.
That should advance the cam.
mark the housing so you can return it.

[kevtherev]

i operated carb on the bench and inspected... all seemed well.

did the cam flip to the highest step when you rotated the butterfly spindle fully?

[MidLifeCrisis]

... but that is not for cold start on idle.. that is for when you put your foot down when cold.. it pulls off the choke to give better acceleration

Not sure I agree with that - see the below from Haynes Carb manual .... it should actuate immediately on engine start to slightly open the choke valve to weaken the mixture

[kevtherev]

... but that is not for cold start on idle.. that is for when you put your foot down when cold.. it pulls off the choke to give better acceleration

Not sure I agree with that - see the below from Haynes Carb manual .... it should actuate immediately on engine start to slightly open the choke valve to weaken the mixture

Is that the 3mm gap setting at idle?
Yes I believe the pull down controls that setting

[MidLifeCrisis]

Is that the 3mm gap setting at idle?
Yes I believe the pull down controls that setting

Yep

[bugsteve]

thank you all for your helpful replies, i was not able to recheck and problem solve yesterday as planned as it was hammering it down here in czech. better weather is here now and should remain over the weekend so i will get on it and report back!

[ajsimmo]

Blimey, this job's a slow burner! Be needing that choke working right soon.
How did the engine rebuild go?