Kombi dies when coming to a stop?

crazyfiggi Wolfsburg Wizard

657 posts · joined Jun 2003 · 13 Sep 2011, 10:46 am

#861809

Hi everyone,
I've got a 77 van with the stock 2L twin carb engine.
For the last two weeks it's started with a strange problem, when I come to a stop at traffic lights etc the idle will drop way down, and sometimes will stall, but if I give the throttle a blip it will go back to idling like it should.
Any ideas what this could be? I've checked for vacuum leaks, idle jets are clear and things like timing and points are all good.
Thanks,
Alex.

greedy53 Bishop of Volkswagenism

3,062 posts · joined Mar 2006 · 22 Sep 2011, 7:03 am

#863323

check your vacume hose to the break boster it may be leaking

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SebastienPeek Custom Title Time!

1,657 posts · joined May 2011 · 22 Sep 2011, 7:59 am

#863332

Could be your automatic choke.
Make sure the wires are plugged into the two solenoids, one found on the right of the carb and one on the left.
Then make sure all of the wires are plugged correctly onto the coil.

The sold one, '73 VW 1303 - Zelda
The project, '74 VW 1303 - Gretl

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 · 22 Sep 2011, 1:25 pm

#863357

crazyfiggi wrote:Hi everyone,
I've got a 77 van with the stock 2L twin carb engine.
For the last two weeks it's started with a strange problem, when I come to a stop at traffic lights etc the idle will drop way down, and sometimes will stall, but if I give the throttle a blip it will go back to idling like it should.
Any ideas what this could be? I've checked for vacuum leaks, idle jets are clear and things like timing and points are all good.
Thanks,
Alex.

sounds like the automatic choke is dropping down too low and when you press the accelerator the choke goes up a step and you get higher idling...

both chokes need checking and maybe adjusting..
or Your idle is just too low...

so both carbies need to be tuned again...

Lee

- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

LUFTMEISTER Veteran Volks Folk

2,041 posts · joined Jul 2005 · 22 Sep 2011, 4:56 pm

#863375

Take your plugs out they will tell you,wet & black = choke. dry & white = air leak.

Customer service is not dead in Australia.

Always after HAZET & MATRA & VW factory tools

helbus Administrator Mad fabricator, paint and body

7,386 posts · joined Sep 2002 · 22 Sep 2011, 6:40 pm

#863397

The idle air system operates off one carby and has tubes to both sides. Kind of like a parasitic idle system. Check it is operating correctly, and smooth idle should be happening. People try to set idle by upping one or both sides, but it is the single idle air bypass that does the job smooth and well.

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crazyfiggi Wolfsburg Wizard

657 posts · joined Jun 2003 · 4 Oct 2011, 5:57 pm

#865256

Well i pulled the carbs off and found the throttle shaft on each side had HUGE amounts of play in them. I made up some new bushes out of brass and rebuilt them. All seems good now!
Alex.

porrerahopeful Learner Dubber

10 posts · joined Sep 2011 · 17 Oct 2011, 1:11 pm

#867368

Those solenoids were always a problem........checked everything else until it was suggested I check them. No problems thereafter.