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Idles fine, accelerates horribly when cold SOLVED

 
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Greg



Joined: 12 Aug 2009
Posts: 490
Location: Jefferson, GA

1969 Volkswagen Beetle

PostPosted: Sun Aug 22, 2010 8:42 pm    Post subject: Idles fine, accelerates horribly when cold SOLVED Reply with quote

I'm looking for suggestions. The car runs great after it's warmed up, and idles fine hot or cold BUT when it's cold, I have a misfire and poor acceleration. Any thoughts come to mind. It's a stock 1500 single port engine using a points replacement module and a rebushed solex 30 pict 2.
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1969 Beetle
1974 Westy FI Conversion


Last edited by Greg on Wed Sep 15, 2010 4:46 pm; edited 1 time in total
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Adams77



Joined: 07 Oct 2008
Posts: 142
Location: Statham, GA


PostPosted: Sun Aug 22, 2010 9:08 pm    Post subject: Reply with quote

check to see if the manifold below the carburetor has "Iced" or is really cold.

What is you choke set at?
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Greg



Joined: 12 Aug 2009
Posts: 490
Location: Jefferson, GA

1969 Volkswagen Beetle

PostPosted: Mon Aug 23, 2010 9:11 pm    Post subject: Reply with quote

Took it for a drive today then checked the heat risers and manifold. The hear risers were working but the part of the manifold directly under the carb was cold and had condesation on it. Could it be the high humidity causing the stumbling when it's cold? Do I need to add a little more choke (or less)?
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Mountain Power House



Joined: 26 Jul 2006
Posts: 879
Location: Aircooled Heaven USA


PostPosted: Mon Aug 23, 2010 9:34 pm    Post subject: Reply with quote

The heat risers should be warm all the way to the center of the manifold.. If not they are clogged.
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Jake Raby
57 Oval
64 Porsche 356C Outlaw
66 Bug -The Plague Returns!
73 VW Thing (Will I ever finish it?)
73 Superbeetle (Suby Power!)
76 Porsche 912E (X3!)
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Greg



Joined: 12 Aug 2009
Posts: 490
Location: Jefferson, GA

1969 Volkswagen Beetle

PostPosted: Mon Aug 23, 2010 10:26 pm    Post subject: Reply with quote

The riser on the left is very hot, the one on the right is warm so I figure they are working. It's the part of the manifold before it divides in two that has the condensaton. Maybe it just takes a while for the heat to make it up to that part?
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Mountain Power House



Joined: 26 Jul 2006
Posts: 879
Location: Aircooled Heaven USA


PostPosted: Tue Aug 24, 2010 12:21 am    Post subject: Reply with quote

It should be an even temp if they aren't clogged... The gasses are suppose to pass through the tube from one bank to the other.
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Jake Raby
57 Oval
64 Porsche 356C Outlaw
66 Bug -The Plague Returns!
73 VW Thing (Will I ever finish it?)
73 Superbeetle (Suby Power!)
76 Porsche 912E (X3!)
79 VW Iltis 4X4
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Adams77



Joined: 07 Oct 2008
Posts: 142
Location: Statham, GA


PostPosted: Tue Aug 24, 2010 9:20 am    Post subject: Reply with quote

Do you have hot air plumbed into the air cleaner? If you have a cheap chrome air cleaner this will accentuate the problem. You need the warm air mix to keep the carb base from cooling.

I know, I had the same problem last year with my super. I used an oil bath cleaner with the correct hot air intake and never had a problem.
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Greg



Joined: 12 Aug 2009
Posts: 490
Location: Jefferson, GA

1969 Volkswagen Beetle

PostPosted: Tue Aug 24, 2010 9:42 am    Post subject: Reply with quote

Hmm, that's a good thought, I had the tube connected but the engine would run hot since I didn't have the cable controlled flap inside the air cleaner hooked up. I may put it back on and do some testing.
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Greg



Joined: 12 Aug 2009
Posts: 490
Location: Jefferson, GA

1969 Volkswagen Beetle

PostPosted: Wed Sep 15, 2010 4:50 pm    Post subject: Reply with quote

I figured out my stumbling problem. The accelerator pump cover had loosened slightly, causing a vacuum leak.
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