Strange VW beetle hesitation

[sebdaneb07]

Hi there,
My 71 beetle has recently been experiencing severe hesitation ( sometimes so much that it stalls at traffic lights) when I try to pull away. I have real trouble getting it into 1st and 2nd as the engine misfires unless I push the pedal down harder and rev it up real good and power shift. Also I've been pumping the gas pedal slightly when driving off to prevent myself from stalling. I've done valve clearances done point gap, it's timed correctly and I've also checked for exhaust leaks and haven't found one (when I cup my hand over carb, engine dies immediately). Oh and also it's not the carb to my knowledge as that has recently had an overhaul :s So what on earth could it be? I thought it might be the fuel pump but surely the engine wouldn't run at all? It idles sweet and once you get it up to 4th it goes okay.

Here's one more baffling fact, the problem is intermittent, usually when I set off it doesn't hesitate at all, only after a while of driving it gets bad!

Any help would be greatly appreciated.

[hotsam]

Could be a vacuum leak, a bad condenser, or the distributer not advancing properly.
_________________
1968 Beetle

[sb001]

If it's only happening after the engine is warmed up, you might check that the fuel pump pushrod guide sleeve is not expanding inside the pump stand causing the rod to catch on it.


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_________________
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]

Also you said the carburetor had recently been overhauled, please also check to make sure the float hinge pin inside the float bowl was oriented correctly- the curved part of the pin faces the FRONT of the car.
_________________
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

[Uberchin]

When you say the carb was 'overhauled', who did it, was it the basic kit? Ensure the throttle shaft isn't leaking vacuum at the bushings. Use starter fluid to spray around the carb and manifold seals to check for leaks. Also, was the accerator pump passages cleaned out; required by removing the two small BBs.

[sebdaneb07]

[sebdaneb07]

[sb001]

[ashman40]

Please ID your carb make/model# and your distributor model#?
Also confirm your ignition timing?

Could it be the "infamous" 34Pict + "009" combo?

This "mash up" is often the cause of massive hesitation on acceleration from idle. In many cases it is NOT possible to "tune" the problem away since these two were never meant to work together.... just saying
_________________
AshMan40
---------------------------
'67 Beetle #1 {project car that never made it to the road }
'75 Beetle 1200LS (RHD Japan model) {junked due to frame rot}
'67 Beetle #2 {2019 project car - Wish me luck!}

[Mark Evans]

[Starbucket]

Check (with motor off) by looking down carb bore and slowly open the throttle, the accelerator pump should start squirting gas as soon as you start and continue till open. If it starts late, move the adjuster on linkage toward +.

[sebdaneb07]

[sebdaneb07]

[Starbucket]

[ashman40]

[sebdaneb07]

[sb001]

[hotsam]

[sebdaneb07]

[sb001]