Intermittent cut out after acceleration

[Volkie1]

I'm finding that if I rev high and have to come to a stop so for example getting caught out by a red light the big will sometimes stifle, bog Down and cut out. The ignition system starts the bug every day on the first spark. Any ideas what it could be I need by Bug running right

[smitty24]

Have you gone through the basics with the fuel system? Correct jets that are clean and no debris in carb passageways? Idle speed good? No vacuum leaks.

[bluebus86]

yes, a basic carb tuning, maybe even disassembly and clean maybe needed. of course before carb tuning, assure no manifold vacuum leaks, test with flammable carbcleaner spray when at idle, squirt cleaner at each manifold joint if idle speed changes, there is a leak at that spot. also get a timing light and check timing and advance, retard operatio .

also assure valves are adjusted prior to carb tuning.

Good luck, let us know how it goes.

Bug On!
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Help Prevent VW Engine Fires, see this link.....Engine safety wire information

Stop introducing dirt into your oil when adjusting valves ... https://www.thesamba.com/vw/forum/viewtopic.php?t=683022

[mukluk]

Having the engine die when you slow or stop abruptly is due to an overly rich idle mixture. Try incrementally turning the volume screw in a quarter to half a turn with a test drive between adjustments. If leaning the mixture via the volume control screw doesn't fix it, your jetting is too large.
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1960 Ragtop w/Semaphores "Inga"

[scottyrocks]

[mukluk]

[scottyrocks]

Got it. Page 9, paragraph 11/23.
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“If you care for a thing long enough, it takes on a life of its own, doesn't it? Mending old things, preserving them, looking after them – on some level there's no rational grounds for it.”
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[smitty24]

Like I mentioned earlier, first thing to do is clean that carb and jets and blow out with compressed air. Most the time your type of symptoms happen when all else is right is crap in your jets or carb, especially with stock single carbs.

I’ve had many stock carb engines do this over the years and it is usually plugged idle jets and small bits of crap getting past filters. Idle jets have TINY drillings. The stock filters are not very good in my opinion. Also, my IDFs did this far more often because stuff got past air filters. When we had forest fires, the ash would get stuck to my filters then implode itself into even smaller particles. It then turned to a sticky emulsion and goes right to your idles! You then start popping and missing on that cylinder. I bought a 30/31 off the internet for my 40horse a few weeks back and it kept cutting out at stops and slowing down. I had perfect tune until it got on the road. I discovered that the manufacturer installed EVERY jet and screw with some type of liquid Teflon seal...which was disintegrating and also going straight to the idle jet. I wire wheeled the crap then the engine ran perfect!

You have to make sure carb and fuel system is clean clean clean. Vw owners don’t seem to understand this enough. Carb and jets must be clean at all times or you have these type of issues. I would also make sure your choke is setup and unloading correctly. I’ve had bypass valves jack up and stick at weird times as well. All stuff everyone should check. Just the nature of owning a classic vw.