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Dune Buggy Won't Stay Running
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CarGuru > Volkswagen > Dune Buggy Won't Stay Running 27 February 2005 19:54:34
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Dune Buggy Won't Stay Running

Will Sheppard 25 February 2005 21:40:52
 I've got a 69 buggy with a dual port engine. It has a 009 dizzy and a 34
pict 3 carb. It starts right up and idles for a few minutes then dies and
is very difficult to restart. When it does restart it won't run properly -
if I hold it at a steady rpm, let's say 2000 it will rev for about 10
seconds then the rpms dive and it dies. A lot of fethering of the pedal
and fooling around is required to get the thing back in the garage but for
the first several minutes it seems to run normally. This seemed like a
carb problem but I just got a working-when-pulled­ carb and the problem
persists!

Any ideas?

Add comment
Speedy Jim 26 February 2005 00:07:12 [ permanent link ]
 Will Sheppard wrote:> I've got a 69 buggy with a dual port engine. It has a 009 dizzy and a 34 > pict 3 carb. It starts right up and idles for a few minutes then dies and > is very difficult to restart. When it does restart it won't run properly - > if I hold it at a steady rpm, let's say 2000 it will rev for about 10 > seconds then the rpms dive and it dies. A lot of fethering of the pedal > and fooling around is required to get the thing back in the garage but for > the first several minutes it seems to run normally. This seemed like a > carb problem but I just got a working-when-pulled­ carb and the problem > persists!>
Any ideas?>

Since you've pretty much ruled out a bad carb, I would be looking
for a vacuum leak. The choke masks the leak by enriching the
mixture at first.

The obvious places to look are the rubber booties on the manifold and
the carb flange-to-manifold.­

If you could get it to run a bit more consitently, you might try the
old spray-solvent trick around suspected areas, but that's hard to
do with an engine that won't stay running.

In extreme cases, I have resorted to applying compressed air (low
press) to the manifold. Create some kind of adapter (duct tape!)
to feed the air into the top of the manifold. Take the rocker
shafts off so all the valves are closed. Use soapy water to look
for leaks.

Might be a good idea to do a compression test beforehand.

Speedy Jim
http://www.nls.net/­mp/volks/
Add comment
Will Sheppard 27 February 2005 09:11:37 [ permanent link ]
 
Since you've pretty much ruled out a bad carb, I would be looking> for a vacuum leak. The choke masks the leak by enriching the> mixture at first.>

Thanks for the suggestions Jim, I think you've solved it! Of course it makes
sense now but for so long I had it in my head that I had a carb problem... I
started the car and sprayed carb cleaner here and there with no effect (choke
fully on.) The car stopped running when I stepped open the choke a bit. I
tightened the screws on the boots and could now get the car to run on the 3rd
or 4th step on the choke assembly. Now when I sprayed carb cleaner at the
manifold-to-head junctions there was a noticeable difference in the idle as
it sucked the cleaner in there. I'll get new rubber boots, clamps, manifold
gaskets on Monday and check that the ends of the manifolds are nice and flat.
Hopefully it will be as simple as that!


Add comment
Will Sheppard 27 February 2005 19:54:34 [ permanent link ]
 
I use some kind of gasket sealant on those metal gaskets.> They worked fine for the factory in production, but in real> life you need to seal them.


I'll do the same. Thanks again!

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CarGuru > Volkswagen > Dune Buggy Won't Stay Running 27 February 2005 19:54:34
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