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Volkswagen Air-Cooled VW: 1952-1979 problems


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Last Post: Jul 9, 2013 2:51 PM Last Post By: tcovenant2000
jecstl

Posts: 1
Registered: 06/27/11
problems
Posted: Jun 27, 2011 11:50 AM
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have a 78 super beetle conv . that i have recently restored but have a engine issue

car starts good and throttles up nicely but when i run it it does well in 1st and second but when i shift to third is misses, hesitates and generally fall flat on its face

what i have done valve adjustment, tried 3 different distributors 009, svda and electronic. timing is right on
new fuel pump electric has used 34ict webers duals

at a loss and out of money to throw at it have been hobby vw for 40 years and i am at a loss

again its quick and powerful in 1st and second
tcovenant2000

Posts: 1,761
Registered: 12/09/03
Re: problems
Posted: Jun 27, 2011 7:45 PM   in response to: jecstl in response to: jecstl
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Quick and powerful in first and second but bogs in third. The faster you go the more power is required, so it sounds like fuel issues.
Is the when it's warmed up or cold? Have you checked that the choke is working properly (opening fully when warm)?
Try this for fun: Adjust the float a bit higher. If you're not getting enough fuel and you're using up what's in the bowl and then starving, this will let you go a little further before it bogs down. If it's better with a higher float then likely you're not getting enough fuel to the carb.
Another possibility is that you/ve got a nasty vacuum leak somewhere so it can't pull enough fuel from the jets.

Thomas
Jack of all Tra...

Posts: 1
Registered: 07/09/13
Re: problems
Posted: Jul 9, 2013 5:11 AM   in response to: tcovenant2000 in response to: tcovenant2000
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My 74 Super beetle has been working great even in the summer heat of late. The engine cover was just put on today. I drove off to town as usual and I had no problems. When I was returning home from my short trip to DMV my engine seemed to stop for a second and I thought it was an air bubble in my fuel line. later this day I was headed off to work and the same problem happened, sort of, after I drove about a mile. I wasn't too worried so I continued to drive off to work. After another 2-3 miles in third gear on level ground around 30-35 mph my engine appeared to cut out on me. To my surprise before I was able to pull off the road it started up again. At this point I knew it was not air in my lines, I think. So I found a place to safely turn around and take the VW home. First gear had no issues nor did driving in second but when I was in third and driving up a slight hill the problem happen again. I managed to get her home safe but now what I am not sure what to make of this problem. Is it my engine cover, or is it my carb, or my new fuel pump, or something totally different. When I read this thread it sounded similar to my issue. Any help in finding a direction on what is causing this problem will be a big help and I thank you in advance.
tcovenant2000

Posts: 1,761
Registered: 12/09/03
Re: problems
Posted: Jul 9, 2013 2:51 PM   in response to: Jack of all Tra... in response to: Jack of all Tra...
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Easy to tell. Pull the engine cover and drive it around a bit. If it's engine cover related then you'll know quickly enough.
There's a stack coming off of the fan/shroud (it's been 10 years since I played with one of these, so a bit fuzzy, sorry). I remember an old air-head mechanic telling me that the stack can plug up and cause problems with too much heat in summer-time. I don't really know much more than that. It could be bad connections causing loss of spark. It could be fuel related. Hard to say. Maybe someone with more recent experience can help.

Thomas

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