Brought to you in part by:

.

Shop Eastwood for your Auto Restoration Needs!


  Mustangsandmore Forums
  '64 1/2 to '73 -- The Classic Mustang
  Holley Carb problem

Post New Topic  Post A Reply
profile | register | preferences | faq | search

UBBFriend: Email This Page to Someone! next newest topic | next oldest topic
Author Topic:   Holley Carb problem
HHuggins
Gearhead

Posts: 182
From: Laguna Niguel, CA
Registered: Feb 2001

posted 04-01-2001 08:07 PM     Click Here to See the Profile for HHuggins   Click Here to Email HHuggins     Edit/Delete Message   Reply w/Quote
So I thought I'd do something easy and change the filter element on my 'stang. It has one of those pillow-shaped Edelbrock air cleaners with the foam filter and a Holley 750. I take out the old one, put in the new one and go and wash up. When I come out a bit later to take a spin the car sputters and spits and sounds generally sick.

I don't know a thing about carbs - any ideas?

HH

IP: Logged

HHuggins
Gearhead

Posts: 182
From: Laguna Niguel, CA
Registered: Feb 2001

posted 04-01-2001 08:16 PM     Click Here to See the Profile for HHuggins   Click Here to Email HHuggins     Edit/Delete Message   Reply w/Quote
A friend of mine just told me that this is a common problem with that Edelbrock air cleaner. Seems the filter element breaks down and gets into the carb, clogging the jets. Probably happened when I took out the old filter.

Sound plausible?

HH

IP: Logged

68fb
Journeyman

Posts: 42
From: LakeStevens, Wa. USA
Registered: Oct 2000

posted 04-01-2001 09:45 PM     Click Here to See the Profile for 68fb     Edit/Delete Message   Reply w/Quote
Make sure that the new filter element is not blocking or obstructing the bowl vent on your carb,(the tube which extends vertically up from the carb). If this is even partiaaly blocked you will stave the engine for fuel. Ideally you should have at least 3/4 inch clearance above the opening of the vent tube.

IP: Logged

HHuggins
Gearhead

Posts: 182
From: Laguna Niguel, CA
Registered: Feb 2001

posted 04-01-2001 10:05 PM     Click Here to See the Profile for HHuggins   Click Here to Email HHuggins     Edit/Delete Message   Reply w/Quote
I just went out and took another look - nothing seems to be blocking the vent.

HH

IP: Logged

68fb
Journeyman

Posts: 42
From: LakeStevens, Wa. USA
Registered: Oct 2000

posted 04-01-2001 10:15 PM     Click Here to See the Profile for 68fb     Edit/Delete Message   Reply w/Quote
Run it down the street or whatever without the air cleaner installed and see if the problem persists.
Process of elimination.

IP: Logged

HHuggins
Gearhead

Posts: 182
From: Laguna Niguel, CA
Registered: Feb 2001

posted 04-01-2001 10:19 PM     Click Here to See the Profile for HHuggins   Click Here to Email HHuggins     Edit/Delete Message   Reply w/Quote
I wish it would go down the street. It won't go five feet - with or without the air cleaner.

HH

IP: Logged

68fb
Journeyman

Posts: 42
From: LakeStevens, Wa. USA
Registered: Oct 2000

posted 04-01-2001 10:32 PM     Click Here to See the Profile for 68fb     Edit/Delete Message   Reply w/Quote
Hmmmmm... nothing down the throats of the carb when veiwed with bright flashlight, no vacuum lines or hoses disturbed during the replacement, Accelerator pump discharing fuel down venturi when carb linkage operated manually,
Visually check to ensure all spark plug leads are secure on the cap/coil, no obstructions down bowl vents when viewed with flashlight..

IP: Logged

HHuggins
Gearhead

Posts: 182
From: Laguna Niguel, CA
Registered: Feb 2001

posted 04-01-2001 10:39 PM     Click Here to See the Profile for HHuggins   Click Here to Email HHuggins     Edit/Delete Message   Reply w/Quote
Thanks - I'll give those things a try tomorrow morning.

Just a bit more info - the car will turn over but then just won't keep running, it really sounds like it isn't getting fuel. It also emits smoke from the exhaust - something it never did before.

HH

IP: Logged

Dave_C
Gearhead

Posts: 755
From: Gadsden, Al
Registered: Aug 99

posted 04-02-2001 12:23 AM     Click Here to See the Profile for Dave_C   Click Here to Email Dave_C     Edit/Delete Message   Reply w/Quote
What color is the smoke? Black, blue or white?

If it's black you may be flooding. Check the float level first. Then maybe a blown power valve.

Also look at the air bleed holes to make sure they aren't plugged.

Later,

David Cole

IP: Logged

racin jason
Gearhead

Posts: 291
From: Sidney, OH
Registered: Jun 99

posted 04-02-2001 10:58 AM     Click Here to See the Profile for racin jason   Click Here to Email racin jason     Edit/Delete Message   Reply w/Quote
My cousin has one of those on his 68 camaro, he got gas or something on it and the foam fell apart.

IP: Logged

SteveLaRiviere
Administrator

Posts: 33988
From: Saco, Maine
Registered: May 99

posted 04-02-2001 01:29 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
In the venturis, there are 4 air bleeds, 2 at each corner. You could have dropped some junk on them, but I doubt they make it run that bad.

Could you have disconnected any vacuum lines or perhaps a spark plug wire or two?

------------------
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L Disposable Commuter
"Keep your driveway all Ford!"

IP: Logged

HHuggins
Gearhead

Posts: 182
From: Laguna Niguel, CA
Registered: Feb 2001

posted 04-02-2001 11:01 PM     Click Here to See the Profile for HHuggins   Click Here to Email HHuggins     Edit/Delete Message   Reply w/Quote
Well, I checked it out with a flashlight and don't see anything blocked. I let it set all day and tried to start it up tonight. It turned over and sounded just fine. I was going to drive it around the block to make sure everthing was okay, but as soon as I put it in gear and started giving it gas it started acting up. It wasn't running as poorly as yesterday, but it wasn't great. I parked it and gave it few good revs and it seemed to clear up and sounded okay. When I got out of the car there were black marks on the pavement outside both exhaust pipes - a black, gritty residue.

HH

IP: Logged

Robert K
Gearhead

Posts: 514
From: Nashville, TN
Registered: Apr 2000

posted 04-03-2001 08:44 AM     Click Here to See the Profile for Robert K   Click Here to Email Robert K     Edit/Delete Message   Reply w/Quote
The exact same thing is happening to MY car!
I've got a Holley 4160 on a 302. Sunday I drove the car for about an hour and it ran like a top. Last night I thought I would change the oil so I start the car to warm it up and it ran terrible. It ran rough and very very rich. The fumes were burning my eyes and throat and there were black marks behind each exhaust pipe. The car was idling rough and then died. I couldn't get it started again. I removed the air-cleaner and gas was all over the intake. I tried to start it again and gas just bubbles up from the carb. I managed to get it started and it ran for maybe 30 secs. to 1 minute but sounded terrible. The carb makes a strange gurgling sound and kinda of spews gas from one of the holes on top of the air horn when trying to start it. I checked for loose vacuum lines, wires etc. I also checked for obstructions in the carb and found none. The car has never backfired to damage the carb. Something has happened to my carb but I'm not sure what. What can go "bad" inside to make it do this?? Are the Holley gods angry? It sounds like whatever is wrong with HH's carb is what's wrong with mine.
Where are the Holley Guru's?

------------------
67convertible 289/auto
65fastback 302/4sp

IP: Logged

SteveLaRiviere
Administrator

Posts: 33988
From: Saco, Maine
Registered: May 99

posted 04-03-2001 09:03 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Robert, you have a stuck float. Probably a piece of dirt in your needle&seat.

------------------
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L Disposable Commuter
"Keep your driveway all Ford!"

IP: Logged

SteveLaRiviere
Administrator

Posts: 33988
From: Saco, Maine
Registered: May 99

posted 04-03-2001 09:06 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
HH, when was the last time your carb was rebuilt?

------------------
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L Disposable Commuter
"Keep your driveway all Ford!"

IP: Logged

68fb
Journeyman

Posts: 42
From: LakeStevens, Wa. USA
Registered: Oct 2000

posted 04-03-2001 09:45 AM     Click Here to See the Profile for 68fb     Edit/Delete Message   Reply w/Quote
I agree. The needle is not closing against the seat allowing the fuel pump to over-fill the float bowl. Is there a filter installed between the the fuel pump and the carb?
Perhaps the needle and seat have worn.

IP: Logged

Stang28965
Gearhead

Posts: 411
From: Webster New York USA
Registered: Mar 2001

posted 04-03-2001 10:42 AM     Click Here to See the Profile for Stang28965   Click Here to Email Stang28965     Edit/Delete Message   Reply w/Quote
This happen to my car last week when I took it out to warm it up.... It did not idle good and did not want to take off. All it was was a bad spark plug, How old are your plugs? If ones bad then that cylinder is dead and will make the car smoke, I'd check into that I had changed all my plugs in my car but forgot 2 because I was distracted and did not get to them, Well, I put the 2 new ones in and it ran perfect.. The old plugs where a year old, I changed them because I went to a leaner jet size.

-Jeff
-Jeff
1965 Mustang Coupe
289 Bored .030over
302 Heads
420 lift Cam
H-Pipe with dynomax mufflers
8 inch rear with 3.55's
4speed trans
http://members.cardomain.com/stang65

IP: Logged

georgeb
Gearhead

Posts: 927
From: Solomons, MD, USA
Registered: Jun 99

posted 04-03-2001 11:35 AM     Click Here to See the Profile for georgeb   Click Here to Email georgeb     Edit/Delete Message   Reply w/Quote
Also check the power valve - if they go bad/leak you get instant over-rich condition.

IP: Logged

Robert K
Gearhead

Posts: 514
From: Nashville, TN
Registered: Apr 2000

posted 04-03-2001 11:39 AM     Click Here to See the Profile for Robert K   Click Here to Email Robert K     Edit/Delete Message   Reply w/Quote
Could I have a blown power valve?
How do I unstick the float if that's the problem? Do I need to remove the carb from the engine or does the top come off like the Autolite 4100. Obviously, I've never worked on a Holley before.
Thanks for everyone's help!

------------------
67convertible 289/auto
65fastback 302/4sp

IP: Logged

SteveLaRiviere
Administrator

Posts: 33988
From: Saco, Maine
Registered: May 99

posted 04-03-2001 03:21 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Robert, if the floats are externally adjustable, you can loosen the lock screw and back them out of the float bowls. If not, you have to remove the float bowls and get at them from the inside.

Sometimes you can get lucky and tap the carb with a screwdriver handle and knock the dirt loose, but you are better off disassembling it and cleaning it.

If your power valve was bad, you wouldn't have fuel flowing out of the vent tube, yours is an obvious float or needle&seat problem.

------------------
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L Disposable Commuter
"Keep your driveway all Ford!"

IP: Logged

Robert K
Gearhead

Posts: 514
From: Nashville, TN
Registered: Apr 2000

posted 04-03-2001 05:59 PM     Click Here to See the Profile for Robert K   Click Here to Email Robert K     Edit/Delete Message   Reply w/Quote
Then basically what you are telling me is this is an "gentle" indicator that my carb should be re-built. I'm lucky I was just stranded in the drive-way instead of the highway. Thanks again for your help!

------------------
67convertible 289/auto
65fastback 302/4sp

IP: Logged

Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 04-03-2001 08:28 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
THE FIRST THING THAT I WOULD DO IS CHANGE THE FUEL FILTER.

------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

IP: Logged

Robert K
Gearhead

Posts: 514
From: Nashville, TN
Registered: Apr 2000

posted 04-04-2001 08:16 AM     Click Here to See the Profile for Robert K   Click Here to Email Robert K     Edit/Delete Message   Reply w/Quote
I don't think it's the fuel filter Alex,
It's getting PLENTY of fuel. Fuel was squirting up thru the air horn when I tried to start it.

I tried to start it again last night and it started right up and ran ok for about 15 seconds, then started running rough and acting like it was going to die. I could already smell the raw gas and shut it off.
So I decided to remove it and take the carb apart last night (it's a 600CFM 4160 by the way) and the secondary fuel bowl doesn't look like it had fuel in it. The float was tight and you could barely move it with your finger. Also the vaccuum diaphragm that actuates the secondaries was torn which probably explains why there was no evidence of fuel in the bowl.
I don't think the floats were set right in the first place. I'm going to get a rebuild kit today and hopefully get it back together tonight. I should have done this a long time ago.

------------------
67convertible 289/auto
65fastback 302/4sp

IP: Logged

All times are ET (US)

next newest topic | next oldest topic

Administrative Options: Close Topic | Archive/Move | Delete Topic
Post New Topic  Post A Reply
Hop to:

Contact Us | Mustangsandmore Front Page

Copyright 2003, Steve LaRiviere. All Rights Reserved.


Ultimate Bulletin Board 5.47d

Amazon Honor System Click Here to Pay Learn More

[Build a free Mustangsandmore.ws Home Page!]

[About M&M][Acronyms][Calendar][Chat][Classifieds] [Members' Pics] [M&M Mug Shots]

[ Mustangsandmore.com Bookstore] [Mustangsandmore.com T-Shirts][Tech Articles]