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mastajusty
Samba Member
Joined: August 22, 2006
Posts: 167
Location: Chattavegas
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 Posted: Sun Feb 14, 2010 6:44 pm Post subject: 34pict -3 and 1776 help |
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I need some help with a engine problem....
The engine is a 1776 dual port, mild cam, and mild rockers. i tried to get the engine running today using a 34pict carb and a vacuum advance dizzy. I was able to get the engine to start (at wide open throttle) and run only when throttling it. As soon as i quit the engine would sputter out.
timing is correct, valves are adjusted, points were adjusted....
I tried adjusting the carb back and forth, replaced the fuel pump, the distributor with a mechanical advance distributor with the same result.
any suggestions? Is a 34pict carb to small?
as always, thanks for the help! |
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Emeritusx
Samba Member
Joined: June 20, 2008
Posts: 2775
Location: 12 inches behind the wheel
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| Posted: Sun Feb 14, 2010 9:17 pm Post subject: Re: 34pict -3 and 1776 help |
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| mastajusty wrote: |
I need some help with a engine problem....
The engine is a 1776 dual port, mild cam, and mild rockers. i tried to get the engine running today using a 34pict carb and a vacuum advance dizzy. I was able to get the engine to start (at wide open throttle) and run only when throttling it. As soon as i quit the engine would sputter out.
timing is correct, valves are adjusted, points were adjusted....
I tried adjusting the carb back and forth, replaced the fuel pump, the distributor with a mechanical advance distributor with the same result.
any suggestions? Is a 34pict carb to small?
as always, thanks for the help! |
you got voltage on the cut off solenoid?
It should run.. will it maintain a constant rpm (say 3000) or does it die unless you make gas shoot in via the accel pump?
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82 Westy ☢, 66 Splitty ☮, 73 Type 181 ✠ |
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borninabus
Samba R&D Dept.
Joined: May 18, 2006
Posts: 4539
Location: Arizona Highways
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| Posted: Sun Feb 14, 2010 10:25 pm Post subject: |
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rebuild the carb.
make sure the idle cut off is working. try another one if you can.
sounds like the idle circuit is not working right.
no, it's not too small.
up the main jet a bit while you're rebuilding it.
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88 Van WBX, A/T - 13 JSW TDI 6M/T - 2012 Touareg TDI Sport |
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mastajusty
Samba Member
Joined: August 22, 2006
Posts: 167
Location: Chattavegas
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| Posted: Mon Feb 15, 2010 6:11 am Post subject: |
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i pulled the carb apart and cleaned everything, Its basically new... not quite but almost. The cut off solenoid is working ( i can hear it click back and forth when power is turned on.)
| Quote: |
| It should run.. will it maintain a constant rpm (say 3000) or does it die unless you make gas shoot in via the accel pump? |
it will run at a constant high rpm for just a bit, not long. It has to have the accel pump throttled back and forth to stay running....
My first thought was it was not getting gas from the pump, but after trying another fuel pump, and an electric one with the same result im guessing its the carb...
would anything else yield this result aside from the carb?
thanks again! |
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borninabus
Samba R&D Dept.
Joined: May 18, 2006
Posts: 4539
Location: Arizona Highways
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| Posted: Mon Feb 15, 2010 8:00 am Post subject: |
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is this an OG carb or a repop (bocar, EMPI)?
do you have access to another carb to try?
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88 Van WBX, A/T - 13 JSW TDI 6M/T - 2012 Touareg TDI Sport |
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mastajusty
Samba Member
Joined: August 22, 2006
Posts: 167
Location: Chattavegas
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| Posted: Mon Feb 15, 2010 8:56 am Post subject: |
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| its a repo, brosal i believe... im trying to track down another carb now but with out much luck... ill turn one up sooner or later though. |
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borninabus
Samba R&D Dept.
Joined: May 18, 2006
Posts: 4539
Location: Arizona Highways
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| Posted: Mon Feb 15, 2010 11:49 am Post subject: |
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if it's a brosol you may have just got one of the "bad" ones.
assuming you did a thorough job rebuilding the carb and put it back together correctly...
the only other thing i can think of that would cause a symptom like that would be a BIG vacuum leak--like in the manifold.
so test for leaks before you throw in the towel on the carb
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88 Van WBX, A/T - 13 JSW TDI 6M/T - 2012 Touareg TDI Sport |
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mastajusty
Samba Member
Joined: August 22, 2006
Posts: 167
Location: Chattavegas
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| Posted: Mon Feb 15, 2010 11:53 am Post subject: |
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| thanks for the input, I'll take a look around for air leaks and also see if i can round up another carb to test with. |
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