Recent Topics
Pressure washer hose keeps failing...
by dlundblad - 10/23/19 04:42 PM
How much should I ask?
by cwilliamsws6 - 10/23/19 04:10 PM
Happy Birthday, "Wierd Al" Yankovic!
by eljefino - 10/23/19 03:49 PM
Havoline ProDS Syn 10W-30 $19.73 6-pack
by Jackson_Slugger - 10/23/19 03:02 PM
Wix Oil Filter Rating Question
by 02vito - 10/23/19 02:30 PM
Help me decide between Fram and Mobil 1
by ZiTS - 10/23/19 02:13 PM
2003 BMW E46 M3 Rotella 15w40
by Manners226 - 10/23/19 02:10 PM
Firearm solvent/oils
by HyundaiAbuser - 10/23/19 01:56 PM
Coloured wax
by Propflux01 - 10/23/19 01:36 PM
Elk Jerky
by 28oz - 10/23/19 01:15 PM
If idle is to be avoided?
by Rglossip - 10/23/19 01:01 PM
Beck Arnley Brake Pads FMSI Materials?
by jrvn - 10/23/19 12:39 PM
Aging - What the ....
by coopns - 10/23/19 12:13 PM
Chevron Supreme 5W20 Bay Area Trade/Sell
by e55amgbenz007 - 10/23/19 10:07 AM
Auto Extra 51348 Vs Napa Gold 1348
by BeerCan - 10/23/19 10:05 AM
Latest Scam Method?
by 2015_PSD - 10/23/19 09:47 AM
Medical bills from 3 year back
by stockrex - 10/23/19 09:31 AM
2019 Nissan Pathfinder CVT drain/fill.
by JTK - 10/23/19 09:19 AM
Newest Members
flyyamata, laoshanren, Vincenze, Alex_CB300R_ABS, TSOC
69652 Registered Users
Who's Online Now
95 registered members (28oz, 2013ecof150, 2oldtommy, 007, 10ecfarmer, 2015_PSD, 9 invisible), 2,309 guests, and 31 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics296,394
Posts5,096,862
Members69,652
Most Online3,532
Jul 30th, 2019
Donate to BITOG
Print Thread
Hop To
Page 1 of 3 1 2 3
Holley carb only works on cold engine #5218690 09/21/19 10:01 AM
Joined: Jul 2007
Posts: 121
L
liberty Offline OP
OP Offline
L
Joined: Jul 2007
Posts: 121
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
Joined: Apr 2008
Posts: 40,526
O
OVERKILL Offline
Offline
O
Joined: Apr 2008
Posts: 40,526
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.


2019 RAM 1500 Sport - Mobil 1 EP 0w-20, FRAM Ultra
2016 Grand Cherokee SRT - Ravenol SSL 0w-40, FRAM Ultra
Re: Holley carb only works on cold engine [Re: liberty] #5218698 09/21/19 10:10 AM
Joined: Jan 2010
Posts: 2,293
J
JeffKeryk Offline
Offline
J
Joined: Jan 2010
Posts: 2,293
Yes, sounds like a choke issue. Is it electric or mechanical?


2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: Holley carb only works on cold engine [Re: liberty] #5218705 09/21/19 10:14 AM
Joined: Sep 2018
Posts: 443
MrMoody Offline
Offline
Joined: Sep 2018
Posts: 443
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).


2018 Hyundai Kona 1.6T DCT
2006 Pontiac (Holden) GTO AT
2001 Pontiac Grand Prix GT 3.8 NA (beater)
2005 Toyota Matrix FWD (ultra beater)
"Fob" and "Noack" are not acronyms.
Re: Holley carb only works on cold engine [Re: liberty] #5218725 09/21/19 10:33 AM
Joined: Jul 2007
Posts: 121
L
liberty Offline OP
OP Offline
L
Joined: Jul 2007
Posts: 121
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
Joined: Jun 2003
Posts: 34,886
E
eljefino Offline
Offline
E
Joined: Jun 2003
Posts: 34,886
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
Joined: Jul 2007
Posts: 121
L
liberty Offline OP
OP Offline
L
Joined: Jul 2007
Posts: 121
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
Joined: Jul 2007
Posts: 121
L
liberty Offline OP
OP Offline
L
Joined: Jul 2007
Posts: 121
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
Joined: Jul 2007
Posts: 121
L
liberty Offline OP
OP Offline
L
Joined: Jul 2007
Posts: 121
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
Joined: Mar 2010
Posts: 5,561
T
The_Eric Offline
Offline
T
Joined: Mar 2010
Posts: 5,561
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?


2005 Lincoln Aviator 4.6 DOHC
2000 Honda Accord 2.3
2001 Hyundai Elantra 2.0
1979 Ford F-150 351M
Re: Holley carb only works on cold engine [Re: liberty] #5218770 09/21/19 11:21 AM
Joined: Sep 2004
Posts: 8,500
A
andyd Offline
Offline
A
Joined: Sep 2004
Posts: 8,500
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


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Holley carb only works on cold engine [Re: liberty] #5218776 09/21/19 11:31 AM
Joined: Jul 2007
Posts: 121
L
liberty Offline OP
OP Offline
L
Joined: Jul 2007
Posts: 121
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
Joined: Sep 2018
Posts: 443
MrMoody Offline
Offline
Joined: Sep 2018
Posts: 443
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.

2018 Hyundai Kona 1.6T DCT
2006 Pontiac (Holden) GTO AT
2001 Pontiac Grand Prix GT 3.8 NA (beater)
2005 Toyota Matrix FWD (ultra beater)
"Fob" and "Noack" are not acronyms.
Re: Holley carb only works on cold engine [Re: The_Eric] #5218782 09/21/19 11:34 AM
Joined: Jul 2007
Posts: 121
L
liberty Offline OP
OP Offline
L
Joined: Jul 2007
Posts: 121
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
Joined: Jul 2007
Posts: 121
L
liberty Offline OP
OP Offline
L
Joined: Jul 2007
Posts: 121
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.

Page 1 of 3 1 2 3
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™