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Old 08-11-2006, 12:41 PM
ole yeller 1978 ole yeller 1978 is offline
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Automatic choke

What is the tube called that runs from the exhaust manifold to the automatic choke and where can I get one?

Thanks,
Jeff
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Old 08-11-2006, 03:11 PM
n9lhm n9lhm is offline
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It is called the heat riser tube, and is available at the HELP aftermarket parts section of most auto parts stores. Costs about $8 IIRC.

It is my understanding that it is no longer available OEM.

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Old 08-12-2006, 07:30 AM
2tone73 2tone73 is offline
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I plugged mine. I don't know what purpose it serves.
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Old 08-12-2006, 07:49 AM
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brings the temp of the choke up so that it can stop choking the engine once it gets warm. If you don't have one you may be running rich.
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Old 08-12-2006, 11:20 AM
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brake line works. I had one break off at the manifold. I just drilled out the remainder of the tube and bent it up to the carb, screwed right in and stayed there for several years.
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Old 08-12-2006, 07:42 PM
Mil1ion Mil1ion is offline
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That choke tube is hooked up to vacuum to suck heated vacuum air into the choke housing to bring the choke off ASAP
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Old 08-12-2006, 08:26 PM
ole yeller 1978 ole yeller 1978 is offline
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Today I looked in the help section of 2 different parts stores and found nothing that would work
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Old 08-14-2006, 01:36 AM
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question was "What is the tube called that runs from the exhaust manifold to the automatic choke"

No vacuum hose here.
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Old 08-14-2006, 06:15 AM
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Actually the vacuum source is internal to the carb. If you have a holley 4160 carb, there is a tube comming off the passenger side secondary barrel. That tube should have a line or tube going down to the exhaust manifold. That is the fresh air intake. There should be another tube that runs from the manifold up to the choke. The choke housing has a passage that connects to manifold vacuum. When running the vacuum pulls filtered, heated air from over the secondary, through the manifold to heat it and up to the choke housing.
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Old 08-14-2006, 06:37 AM
Centroplex Centroplex is offline
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Mine is a later model but on my 84, there is a tube made of flexible material that runs from the manifold on the passenger side to a valve in the air cleaner. The purpose of the tube is to bring warm air from the manifold to help with starting the vehicle under cold conditions. I have always called it a preheater hose but I don't know if this is the proper term. I found one at Advance Auto Parts back near the air filter, oil filter, PCV valve section of the store. Especially in the south, a lot of auto parts clerks have no idea of what the tube or hose is called nor what it is used for as it isn't all that necessary in our climate.
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Old 08-14-2006, 11:27 AM
Mil1ion Mil1ion is offline
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question was "What is the tube called that runs from the exhaust manifold to the automatic choke"

No vacuum hose here.

~~~~~~~~~~~
If this is directed at me.

Where did I say Vacuum HOSE ?


Vacuum... as stated in my previous post RUNS THRU the choke housing and is what sucks the hot air thru that Vacuum TUBE that is mentioned.

Also See Post #9 by another user.

Last edited by Mil1ion; 08-14-2006 at 11:29 AM.
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Old 02-11-2007, 11:11 AM
Razzy1 Razzy1 is offline
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Put an "Electric Choke" on and you won't have to worry about the heat tube!
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Old 02-11-2007, 07:36 PM
81-F-150-Explorer 81-F-150-Explorer is offline
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It's called a Choke stove tube.

You can get these at most autoparts stores, and is carried in the HELP section.

You may have to order one though. Carbed vehicles are getting rarer...

Universal Choke tube kit, for hoking up the choke stove in the manifold to the carb. Motormite, Part number 76850.


Quote:
Originally Posted by Centroplex
Mine is a later model but on my 84, there is a tube made of flexible material that runs from the manifold on the passenger side to a valve in the air cleaner. The purpose of the tube is to bring warm air from the manifold to help with starting the vehicle under cold conditions.
This is the Heat Riser system and is different to the Choke Stove system.

The Factory choke should already be Electric assist, but it needs both the choke tube and the power from the altenator stator to function properly.

Also without the choke tube attached, the carb will be sucking up unfiltered cold air, which can cause problems, and carb icing as well as cooling off the choke so it closes even with the engine hot.

hope this helps...
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Old 02-11-2007, 07:42 PM
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This is an old thread but thanks for the info.
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Old 02-11-2007, 08:19 PM
81-F-150-Explorer 81-F-150-Explorer is offline
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This is an old thread but thanks for the info.

Doh!

Well at least it's only 6 months out...

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Old 02-11-2007, 08:19 PM
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