Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1973 - 1979 F-100 & Larger F-Series Trucks
Sign in using an external account
Register Forgot Password?


1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
LinkBack Thread Tools Search this Thread
  #1 (permalink)  
Old 04-03-2012, 10:40 PM
Ford59galaxie Ford59galaxie is offline
Junior User
 
Join Date: Nov 2011
Posts: 74
Ford59galaxie is starting off with a positive reputation.
460 idles fast and cant slow down

I put a 1977 460 in a 1979 3/4ton and I cannot get this motor to idle down. The facts are I put a early 429 timing chain and gears on this 460 to get away from the retarded timing. I took all of the emission/smog equipment off. There seems to be no vacuum leaks and all ports are capped off. I sprayed wd40 all around this motor checking for leaks and it made no difference in engine run. The only thing leaking is around the bottom of the automatic choke on the intake manifold but this should make no difference because it runs off exhaust. (I now use manual choke) I am using a brand new holley carburetor and have open headers. When you shut the key off the motor diesels itself (keeps turning over). The primary and secondarys in the carburetor close all the way indiacting no vacuum leak. The motor is timed now and the vacuum advance is working although acts weird when you take the vacuum from the distributor the timing will retard itself. Does anybody have any ideas/suggestions I could try?? Thanks
Reply With Quote
  #2 (permalink)  
Old 04-03-2012, 10:44 PM
Ford59galaxie Ford59galaxie is offline
Junior User
 
Join Date: Nov 2011
Posts: 74
Ford59galaxie is starting off with a positive reputation.
I also forgot to mention that the idle screws are all the way in and wont slow anything down to where it should be running. Throttle is all the way backed off also.
Reply With Quote
  #3 (permalink)  
Old 04-03-2012, 10:49 PM
devino246's Avatar
devino246 devino246 is offline
Post Fiend
 
Join Date: Mar 2011
Location: Lynchburg, VA
Posts: 8,452
devino246 has a superb reputationdevino246 has a superb reputationdevino246 has a superb reputationdevino246 has a superb reputationdevino246 has a superb reputationdevino246 has a superb reputationdevino246 has a superb reputationdevino246 has a superb reputationdevino246 has a superb reputationdevino246 has a superb reputationdevino246 has a superb reputation
Float levels and idle mixture set correctly? What's your initial timing?

BTW, vacuum going to the distributor is vacuum advance. Removing vacuum from the distributor should retard the timing.
__________________
Devin- 1979 F150, 351m/C6

Licensed Virginia Safety Inspector
Quote:
Originally Posted by dustybumpers View Post
I'm cheaper than Devin
Reply With Quote
  #4 (permalink)  
Old 04-03-2012, 10:54 PM
OldStyle's Avatar
OldStyle OldStyle is offline
Rusty Roller
 
Join Date: Oct 2011
Location: Santa Cruz Mountains
Posts: 1,321
OldStyle has a good reputation on FTE.OldStyle has a good reputation on FTE.
Sounds like you are doing two things wrong. First you time the engine with the vac advance hose removed and plugged off. Second the vac advance hose goes to a ported vacuum source; meaning there is NO vacuum at idle.

The idle mixture screws should start with a basic adjustment of 1 1/2 turns out and the rpm at approx. 650 w the vac adv line off and plugged.

.
Reply With Quote
  #5 (permalink)  
Old 04-03-2012, 10:57 PM
7636074460 7636074460 is offline
Elder User
 
Join Date: Oct 2011
Location: down a red dirt road
Posts: 556
7636074460 is gaining momentum as a positive member of FTE.
first thing the reason for the timing change is because you either have the advance line hooked into the manifold itself or the bottom port on that holley(Full Vacuum sources) if want to change that, hook the advance to the upper vacuum port which will only have vacuum when you open the throttle.

you didnt say anything about your idle set screw, is it all the way out???? try turning in the idle mixture screws a 1/4 turn each also. you should be able to turn one side down until the you hear the idle change them come back out a fraction, repeat on the other side
Reply With Quote
  #6 (permalink)  
Old 04-03-2012, 11:40 PM
Ford59galaxie Ford59galaxie is offline
Junior User
 
Join Date: Nov 2011
Posts: 74
Ford59galaxie is starting off with a positive reputation.
Sorry i forgot to indicate that i currently have the idle screws nearly all the way in. Which in reality the motor shouldnt even run like this. But i did time the motor with the vacuum blocked off. But 1 thing you said that the vacuum should not be running at idle. I currently have the hose running to a bottom port on the holley which DOES give vacuum on idle. It originally ran on a ported vacuum switch but the threads were bad and leaking antifreeze so i ran it directly to the carburetor. You also said that i could run it on an upper carb port to only get vacuum with some throttle? Would this cause it to run rough on idle though? thanks guys
Reply With Quote
  #7 (permalink)  
Old 04-03-2012, 11:52 PM
Zigmyster Zigmyster is offline
Junior User
 
Join Date: Jan 2012
Posts: 51
Zigmyster is starting off with a positive reputation.
Disconnect your throttle linkage at the carb and see if that makes a difference. You said you changed the carb. Possibility that the linkage is keeping it front idling down?
Reply With Quote
  #8 (permalink)  
Old 04-03-2012, 11:55 PM
Zigmyster Zigmyster is offline
Junior User
 
Join Date: Jan 2012
Posts: 51
Zigmyster is starting off with a positive reputation.
meant.. from idling down..
Reply With Quote
  #9 (permalink)  
Old 04-04-2012, 07:34 AM
Ford59galaxie Ford59galaxie is offline
Junior User
 
Join Date: Nov 2011
Posts: 74
Ford59galaxie is starting off with a positive reputation.
The throttle is backed all the way off
Reply With Quote
  #10 (permalink)  
Old 04-04-2012, 07:55 AM
ChiefM's Avatar
ChiefM ChiefM is offline
FTE Chapter Leader
 
Join Date: Aug 2011
Location: Camilla Georgia
Posts: 1,343
ChiefM has a great reputation on FTE.ChiefM has a great reputation on FTE.ChiefM has a great reputation on FTE.ChiefM has a great reputation on FTE.
The dizzy should not have vacume at idle, IT HAS TO BE PORTED.
__________________
Stephen
Georgia Chapter Leader
1979 F100, 351M, C6, long bed
Join the Georgia Forum- Click Here

Reply With Quote
  #11 (permalink)  
Old 04-04-2012, 08:33 AM
OldStyle's Avatar
OldStyle OldStyle is offline
Rusty Roller
 
Join Date: Oct 2011
Location: Santa Cruz Mountains
Posts: 1,321
OldStyle has a good reputation on FTE.OldStyle has a good reputation on FTE.
Lets start from scratch. Starting with a warm engine. Start the engine and then with the vac advance hose disconnected and plugged.
Disconnect your throttle linkage so that's not an issue; holding the throttle slightly open.
Set your timing to spec. Stop the engine.

Make sure your choke is full open and the fast idle cam IS NOT engaging the adjustment screw.

Turn your idle mixture screws in lightly till they stop then back each one out 1 an 1/2 turns. Start the engine.

If it won't idle turn the idle speed screw in till the arm moves slightly. try starting it again. Repeat till it keeps running.

Adj the idle speed screw till the rpm is near 650. Then you can start adjusting the mixture screws for smooth idle and highest vacuum; lowering the speed accordingly keeping in the 650rpm range. It might take a few back and forth adjustments to get it best.

When you are happy with the carb then reattach the ported vac hose. The engine sound and speed should stay the same. If it changes double check to verify you have NO VAC at idle.

Reconnect the throttle linkage making sure there is free play and it isn't holding the throttle plates open.

The only thing left is to set the choke and fast idle adjustments. You can manually move the choke cam to the higher notch and adj the fast idle speed screw, on the choke side of the carb, to specified rpm, 1200 or so.

Then when cold turn your choke cap to set your cold start position.

Sorry I don't have the specs but we don't know what model Holley you have and I don't have those anyway.

My apologies if I have left anything out; doing this from memory.....

.
__________________
1956 F600 352 (on propane) Boom Truck w/2 22t wenches
1964 F100 4x4 460ci C-6 3/4t springs 31 spline Lincoln rear axle front disks AC ect...
1973 F100 4x2 360 (DOA)
1974 F100 4x4 360 flatbed
1978 F250 4x4 429ci C-6 33's
Reply With Quote
  #12 (permalink)  
Old 04-04-2012, 08:52 AM
F-250 WARHORSE's Avatar
F-250 WARHORSE F-250 WARHORSE is offline
Elder User
 
Join Date: Nov 2009
Location: montrose, co
Posts: 952
F-250 WARHORSE is gaining momentum as a positive member of FTE.F-250 WARHORSE is gaining momentum as a positive member of FTE.
I have seen those holleys hold the primaries open by the fast idle adjustment screw. Even if the fast idle is totally off if the screw is too far in then it won't let the primaries close. Have you verified that the primaries are actually closed or are you assuming so because the screw is backed off? If your screw is backed off but the throttle stop isn't hitting the screw then you have a condition to address elsewhere. It sounds to me like your fast idle adjustment screw needs backed off. If your throttle is open far at all on a holley you run in the transition circuit and then the idle screws affect nothing and you get a nasty flat spot off idle. Verify that the throttle plates are actually closed, and hitting stop screw before you go anywhere. With the throttle plates open at all your vaccuum advance is getting vaccuum and you aren't isolating your idle circuits so you will never get it right.
__________________
Due to the recent economic down turn, rising energy costs and mandatory labor cuts, the light at the end of the tunnel has temporarily been shut off, sorry for the inconvenience.
Reply With Quote
Old 04-04-2012, 08:52 AM
Reply

Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1973 - 1979 F-100 & Larger F-Series Trucks

Tags
1976, 351w, 460, adj, advance, backed, fast, ford, high, holley, idle, idles, primarysecondary, screw, timing, vacuum, wont

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump



All times are GMT -5. The time now is 10:32 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup