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Holley carb only works on cold engine #5218690 09/21/19 10:01 AM
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liberty Offline OP
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I have a 1977 ford 361fe engine with a 4 barrel holley carb that has a built in governor. It is the OE carb. Upon starting a cold engine the truck runs great. After 5 to 10 min of run time the primary flaps do not open upon pressing the throttle. Fuel squirts but the flaps do not open. This is only on a hot engine. I can manually push them open with a screw driver and the engine will run great.They will stay open with the throttle once assisted. There must be some kind of vacuum problem in the carb when warm. Any ideas?

Re: Holley carb only works on cold engine [Re: liberty] #5218694 09/21/19 10:03 AM
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I assume you are talking about the choke flap that's supposed to retract once sufficient heat is achieved? There should be an actuator for it on the side of the carb, it may have pooped the bed or the linkage for it is binding up/corroded.


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Re: Holley carb only works on cold engine [Re: liberty] #5218698 09/21/19 10:10 AM
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Yes, sounds like a choke issue. Is it electric or mechanical?


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Re: Holley carb only works on cold engine [Re: liberty] #5218705 09/21/19 10:14 AM
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MrMoody Offline
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In a few more years, all the people who know how to work on automotive carburetors will be dead. There were never that many who were good at it.

I'm not familiar with the particular carb you're talking about. By "primary flaps" I will assume you mean choke plate(s).

So you have a choke malfunction where it is sticking on. Generally, chokes are either manual (work with a dash knob, check the cable operation), work from a bimetal strip heated by the engine (check and make sure it isn't broken or unlinked) or electric (also bimetal but heated electrically instead of by the engine, make sure power is getting to it and it is not internally broken).


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Re: Holley carb only works on cold engine [Re: liberty] #5218725 09/21/19 10:33 AM
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No electric choke. Manual only. It has a governor and I just spoke with a Holley tech and he believes it is in there. The primary plates are not directly attached to the throttle linkage like on a normal carb. That is why they are acting up on a warm engine.

The choke cable is actually frozen and it starts without the choke. Th truck also came with a manual choke from the factory.

Last edited by liberty; 09/21/19 10:34 AM.
Re: Holley carb only works on cold engine [Re: liberty] #5218735 09/21/19 10:43 AM
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eljefino Offline
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Get us a picture. If there's a governor, there's a linkage coming out of the engine, and a funky one that translates pedal input to throttle opening.

My mercedes turbodiesel of all things had an amazing "mechanical computer" that did all this. Linkages galore. It was a primitive smog thing to make sure it wouldn't over-fuel before the revs caught up.

Re: Holley carb only works on cold engine [Re: liberty] #5218747 09/21/19 10:51 AM
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There is no linkage from the engine. The only linkage is the throttle linkage. I will post a pic

Re: Holley carb only works on cold engine [Re: liberty] #5218751 09/21/19 10:58 AM
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Here they are

IMG_20190921_115309023.jpgIMG_20190921_115315324.jpgIMG_20190921_115321071_HDR.jpg
Re: Holley carb only works on cold engine [Re: liberty] #5218752 09/21/19 10:59 AM
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The governor is on the left. It is all vacuum operated.

Re: Holley carb only works on cold engine [Re: liberty] #5218759 09/21/19 11:03 AM
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An important note for those responding - governed holleys do not have a mechanical linkage to the throttle plate. It's connected by a vacuum can instead. I'm not terribly informed on them, but I think they can have temp switches for the throttle and timing too.


Does it rev when cold?


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Re: Holley carb only works on cold engine [Re: liberty] #5218770 09/21/19 11:21 AM
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More wild guesses. Take a couple samples of the vacuum line to a parts store and buy 2x as much as you think you need.I'd replace every bit of the vacuum hose. in the emissions system. EGR???? Get as big a copy of the Vacuum circuit off the inter-web as you can find good luck, please post a follow up. grin2


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Re: Holley carb only works on cold engine [Re: liberty] #5218776 09/21/19 11:31 AM
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There is only a couple vacuum hoses. PCV, Vacuum advance, and one for the gov. They are good. There is no egr system. This is an old truck. Very simple.

Last edited by liberty; 09/21/19 11:33 AM.
Re: Holley carb only works on cold engine [Re: liberty] #5218781 09/21/19 11:33 AM
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Have you opened the vacuum servo? On something that old, the diaphragm is suspect.

To add, vacuum secondaries are very common. Sounds like this one has vacuum primaries.

Last edited by MrMoody; 09/21/19 11:38 AM.

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2006 Pontiac (Holden) GTO AT
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"Fob" and "Noack" are not acronyms.
Re: Holley carb only works on cold engine [Re: The_Eric] #5218782 09/21/19 11:34 AM
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Originally Posted by The_Eric
An important note for those responding - governed holleys do not have a mechanical linkage to the throttle plate. It's connected by a vacuum can instead. I'm not terribly informed on them, but I think they can have temp switches for the throttle and timing too.


Does it rev when cold?


Works fine cold. I think it is internal on the carb gov vacuum system. Even the Holley tech did not know much about this style. That shows how old it is. I am going to remove the carb and see if I can somehow eliminate the vacuum gov and make it a mechanical linkage.

Last edited by liberty; 09/21/19 11:35 AM.
Re: Holley carb only works on cold engine [Re: MrMoody] #5218784 09/21/19 11:36 AM
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Originally Posted by MrMoody
Have you opened the vacuum servo? On something that old, the diaphragm is suspect.

That is what I am going to do next.

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