Carburetor issues

[jsirhc22]

so i’m trying to get my 71 super beetle timed correctly and get the carburetor tuned right as well. starts up fine and the idle is a little fast. the idle screw is just barely touching the cam when the car is off. tried to let the engine warm up but fails to idle when warm because the screw isn’t touching the cam anymore. turned the engine off again and the screw sits on the bottom of the cam like before. so why isn’t the screw touching the bottom of the cam when the car is running??? is it possible that i installed the accelerator cable too tight? sorry if i’m a bit unclear about what happening, it’s hard to put into terms when you’re new. anyways not sure how to go about this without possibly messing up other stuff.

[jsirhc22]

it’s a solex 34pict 3 if that’s important to know

[AlmostHeavenWV_VW]

Since it's a 34pict3 go to the 'stickies/FAQs' thread at the top of the forum page.

In there, scroll down to the 'technical' section

There's two threads on troubleshooting the 34pict3.

Also take note of your carb flange # to determine if it might be one set up for a DVDA or SVDA distributor. Here's my carb flange base # (mine is a DVDA set up carb)

https://www.thesamba.com/vw/forum/viewtopic.php?t=183060
_________________
1973 Standard Beetle
1600DP AK case
Solex 34PICT3 Carb
Bosch DVDA 205AJ Distributor

[wcfvw69]

http://www.vw-resource.com/34pict3.html


Here's a good read. Is this a restored Solex carb? What distributor are you running? Can you take a picture of the engine compartment so we can see your engine?
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Decades of VW and VW parts restoration experience.
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**Now rebuilding throttle bodies for VW's and Porsche's**
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[jsirhc22]

[Cusser]

[wcfvw69]

[jsirhc22]

[jsirhc22]

[Ricksurfin]

Loosen throttle cable, readjust to specs, and check again.

[wcfvw69]

How did you adjust your timing? It should be at 5* ATDC. Read that article from Rob and Dave's site on the proper adjustment of that carb.
_________________
Contact me at [email protected]
Follow me on instagram @sparxwerksllc

Decades of VW and VW parts restoration experience.
The Samba member since 2004.

**Now rebuilding throttle bodies for VW's and Porsche's**
**Restored German Bosch distributors for sale or I can restore yours**
**Restored German Pierburg fuel pumps for sale or I can restore yours**
**Restored Porsche fuel pumps or I can restore yours**
**Restored Porsche distributors or I can restore yours**

[jsirhc22]

[jsirhc22]

[David_nc_72std]

Does sound like either the throttle cable is too tight, or maybe the engine mounts have a problem and the engine is shifting while running. Have you tried running the engine with the throttle cable disconnected to see if the problem goes away? Does the throttle return spring seem to have enough tension when the throttle is closed? If it were extremely loose, I guess the engine vacuum might try to pull the throttle plate open a bit, but that seems extremely unlikely, especially on a professionally rebuilt carb.

I can see you have the extra arm for the throttle positioner, but it appears to be adjusted properly to keep it off the throttle arm.

[sb001]

Please do the following:

Start up the car, drive it around for a while or let it sit and idle or whatever, until the engine is completely warmed up, and the stepped cam on the carb has rotated all the way around to where the fast idle screw is (or isn't in your case) touching the bottom step of the cam. (I am assuming when you say the car won't idle at this point that you mean it is HIGH idling- since if that screw is not resting against the cam, it should be holding the throttle plate more open- it should not completely die.)
If the car IS in fact still running at this point, go around and watch the throttle arm as someone else turns the engine off. See if you see the throttle arm actually immediately move the fast idle screw into position against the cam, or if it very slowly comes back into contact with the cam.
If it's immediate, then there is something causing the throttle arm to hang up (although I can't for the life of me imagine anything that would immediately correct that simply by turning the engine off.)
If it's a gradual move back into position, your throttle arm could simply be sticking a bit in the throttle shaft, perhaps some cleaning residue is still in there causing it to stick. If so you should be able to work the throttle arm back and forth a bit while spraying a bit of carb cleaner or WD-40 or lithium grease or whatever around that spot.
One more question- when you got the carburetor back from volkzbitz, had he already adjusted the choke for you? Or did you do that yourself?
_________________
I'm the humblest guy on this board.

1969 autostick sedan, family owned since new
1600 SP engine
Solex 30 PICT 3 carburetor
Bosch 113905205AE autostick distributor

[sb001]

[jsirhc22]

[sb001]

If it was a stuck throttle cable, turning the car off shouldn't make any difference- the throttle arm screw would still be held away from the cam (unless of course you went back later and pressed the gas pedal to reset it.)
I'm racking my brain trying to think of something that "resets" when you turn the car off that would cause the throttle arm to suddenly "jerk' back into position against the cam, but I can't think of anything.
_________________
I'm the humblest guy on this board.

1969 autostick sedan, family owned since new
1600 SP engine
Solex 30 PICT 3 carburetor
Bosch 113905205AE autostick distributor

[Ricksurfin]

[jsirhc22]