Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1967 - 1972 F-100 & Larger F-Series Trucks
Sign in using an external account
Register Forgot Password?


1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 07-24-2014, 01:29 AM
carchub's Avatar
carchub carchub is offline
Senior User
 
Join Date: Aug 2012
Location: Oregon
Posts: 337
carchub is starting off with a positive reputation.
Low Idle & Dying

Alright so some may know me about my radiator deal; I bought a used radiator today, haven't installed yet.

But what I'm on here about now is that my truck has a suuuuper low idle and likes to die unless I'm giving some throttle.

Some things; PO ziptied manual choke wide open. Also, seems to me that this started happening after I tightened my alternator belts. Just some facts to think about. I was thinking about my coolant level, too. I topped off completely right before my drive and the low idle issue seemed to be more prominent; bad water pump?

Anyways, I'm going to check my timing asap, to make sure it's 6 degrees BTDC. If I feel courageous I'll set it to 10. Whatever the case, I'm going to get timing out of the question and see if that's my issue.

Then I'll be testing my alternator...really don't think it's faulty but I gotta know for sure. After that, I'll tackle the carb. Hopefully cutting the zip tie doesn't open a whole 'bother can o' worms of trouble. But maybe my issue is that the choke wide open is making it too lean, who knows.

My headlights dim almost completely off when the truck is about to die at really low idle, what would that mean, or be caused by?

I can only do all of this if I have time at work, which I probably won't soon, but I'll keep this updated with what I find. In the meantime I'd appreciate input from your own experiences. Maybe my timing chain jumped a tooth?
Reply With Quote
  #2  
Old 07-24-2014, 01:49 AM
351Cleveland C4's Avatar
351Cleveland C4 351Cleveland C4 is offline
Postmaster
 
Join Date: Jul 2011
Location: On the Edge of the Desert
Posts: 3,255
351Cleveland C4 has a good reputation on FTE.351Cleveland C4 has a good reputation on FTE.351Cleveland C4 has a good reputation on FTE.
I would set timing at 10, and try to re adjust the carb. Set mixture screws to 2 turns rich. That should make any engine run. Set idle speed to 650-700.

Headlights dimming is a direct result of the alternator not spinning fast enough to produce the necessary voltage.

If the water pump shelled out, then it could possibly creating a huge drag on the engine.

Try running without the belt(s) for a minute. If it runs normal start looking for the drag.
__________________
Gas is great, but Diesel kicks Gas
'71 F100 351C 2V, Edelbrock Power Pack, AOD trans
and 7 other fords...
Reply With Quote
  #3  
Old 07-24-2014, 01:56 AM
351Cleveland C4's Avatar
351Cleveland C4 351Cleveland C4 is offline
Postmaster
 
Join Date: Jul 2011
Location: On the Edge of the Desert
Posts: 3,255
351Cleveland C4 has a good reputation on FTE.351Cleveland C4 has a good reputation on FTE.351Cleveland C4 has a good reputation on FTE.
I would set timing at 10, and try to re adjust the carb. Set mixture screws to 2 turns rich. That should make any engine run. Set idle speed to 650-700.

Headlights dimming is a direct result of the alternator not spinning fast enough to produce the necessary voltage.

If the water pump shelled out, then it could possibly creating a huge drag on the engine.

Try running without the belt(s) for a minute. If it runs normal start looking for the drag.
__________________
Gas is great, but Diesel kicks Gas
'71 F100 351C 2V, Edelbrock Power Pack, AOD trans
and 7 other fords...
Reply With Quote
  #4  
Old 07-24-2014, 02:15 AM
carchub's Avatar
carchub carchub is offline
Senior User
 
Join Date: Aug 2012
Location: Oregon
Posts: 337
carchub is starting off with a positive reputation.
Quote:
Originally Posted by 351Cleveland C4 View Post
I would set timing at 10, and try to re adjust the carb. Set mixture screws to 2 turns rich. That should make any engine run. Set idle speed to 650-700.

Headlights dimming is a direct result of the alternator not spinning fast enough to produce the necessary voltage.

If the water pump shelled out, then it could possibly creating a huge drag on the engine.

Try running without the belt(s) for a minute. If it runs normal start looking for the drag.
Okay, I will try 10 and that idle rpm.

About the alternator: it ran fine when the belts were taught but not tight; now they're tight. Would the belts being tighter make it difficult for it to turn?

Also, what exactly does shelled out mean?

Thank you for your help, I'll be testing these things
Reply With Quote
  #5  
Old 07-24-2014, 02:18 AM
351Cleveland C4's Avatar
351Cleveland C4 351Cleveland C4 is offline
Postmaster
 
Join Date: Jul 2011
Location: On the Edge of the Desert
Posts: 3,255
351Cleveland C4 has a good reputation on FTE.351Cleveland C4 has a good reputation on FTE.351Cleveland C4 has a good reputation on FTE.
Shelled out usually refers to a bearing going out or major mechanical failure.

If your alternator bearing was going bad that could also do it. But I would think the belt would slip first.
__________________
Gas is great, but Diesel kicks Gas
'71 F100 351C 2V, Edelbrock Power Pack, AOD trans
and 7 other fords...
Reply With Quote
  #6  
Old 07-24-2014, 07:46 AM
Rasputin53's Avatar
Rasputin53 Rasputin53 is offline
Senior User
 
Join Date: Mar 2013
Location: Garner NC
Posts: 333
Rasputin53 is starting off with a positive reputation.
Sounds more like a vacuum leak. Do you have power brakes? Check the hose from the manifold to the booster. That's where my leak was, right at the manifold elbow.
And I always rebuild the carb. Just a good starting point. Use the Ford kit.
__________________
Haulin' @ss and anything else that will fit in the bed.
Reply With Quote
  #7  
Old 07-24-2014, 09:06 AM
carchub's Avatar
carchub carchub is offline
Senior User
 
Join Date: Aug 2012
Location: Oregon
Posts: 337
carchub is starting off with a positive reputation.
Yeah I've known for a while that my booster hose is old and a little leaky, but not too bad. I remember it being difficult to find a replacement a long time ago for some reason.

And yeah I really want to rebuild the carb. I was planning on getting the kit from holley, but what's this Ford kit you mentioned? I have a Holley 2300
Reply With Quote
  #8  
Old 07-24-2014, 09:20 AM
carchub's Avatar
carchub carchub is offline
Senior User
 
Join Date: Aug 2012
Location: Oregon
Posts: 337
carchub is starting off with a positive reputation.
When setting the timing, which end of the marks to you count 6 or 10 from? I'm only confused because it starts at ATC 0, goes to 10, 20, and then 30 BTC and then it says B2 after BTC.

Right now I'm going 10 marks after ATC. Is that correct for 10 BTDC?
Reply With Quote
  #9  
Old 07-24-2014, 10:35 AM
Rasputin53's Avatar
Rasputin53 Rasputin53 is offline
Senior User
 
Join Date: Mar 2013
Location: Garner NC
Posts: 333
Rasputin53 is starting off with a positive reputation.
My bad, I thought you had a 2100. Cap off the booster port at the intake manifold and see if your idle problem goes away. I simply got 3' of the correct size vacuum hose to swap out the old line. And two band clamps of the right size. Don't tighten too much on the booster check valve side or you will have to replace that too. Mine really stumbled until I replaced that line.
__________________
Haulin' @ss and anything else that will fit in the bed.
Reply With Quote
  #10  
Old 07-24-2014, 10:48 AM
carchub's Avatar
carchub carchub is offline
Senior User
 
Join Date: Aug 2012
Location: Oregon
Posts: 337
carchub is starting off with a positive reputation.
Okay, thank you!
Reply With Quote
  #11  
Old 07-24-2014, 11:48 AM
351Cleveland C4's Avatar
351Cleveland C4 351Cleveland C4 is offline
Postmaster
 
Join Date: Jul 2011
Location: On the Edge of the Desert
Posts: 3,255
351Cleveland C4 has a good reputation on FTE.351Cleveland C4 has a good reputation on FTE.351Cleveland C4 has a good reputation on FTE.
Quote:
Originally Posted by carchub View Post
When setting the timing, which end of the marks to you count 6 or 10 from? I'm only confused because it starts at ATC 0, goes to 10, 20, and then 30 BTC and then it says B2 after BTC. Right now I'm going 10 marks after ATC. Is that correct for 10 BTDC?
No, you want to go the other way. As the engine is turning, it should fire before the marks hit TDC.
__________________
Gas is great, but Diesel kicks Gas
'71 F100 351C 2V, Edelbrock Power Pack, AOD trans
and 7 other fords...
Reply With Quote
  #12  
Old 07-24-2014, 11:56 AM
orich's Avatar
orich orich is offline
Postmaster
 
Join Date: Aug 2003
Location: San Jose ca.
Posts: 3,197
orich is gaining momentum as a positive member of FTE.orich is gaining momentum as a positive member of FTE.
2x on vacuum leaks. Also check for a bad dizzy vacuum advance before changing the timing & messing with the carb adjustments..
Orich
__________________
1971 F250 4wd Nv4500-5spd O/D 416cid owned since 1978. Toured Vietnam 1968-70 15 months 512th Trans Co. Driver of the Iron Butterfly Gun truck http://www.youtube.com/watch?v=5H7U71KZEJw
http://www.youtube.com/watch?v=Lemll...r_embedded#t=0 & http://www.youtube.com/watch?v=119sc1w8J2Y#t=2
Reply With Quote
  #13  
Old 07-24-2014, 02:52 PM
carchub's Avatar
carchub carchub is offline
Senior User
 
Join Date: Aug 2012
Location: Oregon
Posts: 337
carchub is starting off with a positive reputation.
Sounds good. So I should make my mark where it says 20?
Reply With Quote
  #14  
Old 07-24-2014, 04:06 PM
351Cleveland C4's Avatar
351Cleveland C4 351Cleveland C4 is offline
Postmaster
 
Join Date: Jul 2011
Location: On the Edge of the Desert
Posts: 3,255
351Cleveland C4 has a good reputation on FTE.351Cleveland C4 has a good reputation on FTE.351Cleveland C4 has a good reputation on FTE.
Depending on what style balancer and tab you have.

If the balancer is marked with numbers or the tab is marked with numbers. Either way you want the 10btdc to line up with the mark/tab.
__________________
Gas is great, but Diesel kicks Gas
'71 F100 351C 2V, Edelbrock Power Pack, AOD trans
and 7 other fords...
Reply With Quote
  #15  
Old 07-24-2014, 05:23 PM
carchub's Avatar
carchub carchub is offline
Senior User
 
Join Date: Aug 2012
Location: Oregon
Posts: 337
carchub is starting off with a positive reputation.
The marks are on the balancer, and look something like


ATC 0 / / / / / / / / / 10 / / / / / / / / / 20 / / / / / / / / / 30 BTC

I thought I'd be aiming for the 10, but if it needs to be on the BTC side then I was saying I'd aim for the 20. Still confused by the balancer, I don't know why ATC is written at 0 degrees before top dead center
Reply With Quote
Old 07-24-2014, 05:23 PM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
1976 400m rough idle - Motorcraft 2150 '1.08' wekke 335 Series- 5.8/351M, 6.6/400, 351 Cleveland 5 10-12-2014 12:05 PM
Engine won't run, at whit's end. nothercrash 1973 - 1979 F-100 & Larger F-Series Trucks 60 01-07-2011 11:52 AM
351w manual choke not working? towmater 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks 3 07-27-2007 01:08 PM
Carbs, Wipers, and Fuses, Oh My! jfarcas 1973 - 1979 F-100 & Larger F-Series Trucks 10 07-13-2006 11:47 AM
Is my choke working properly? 460 Fuel Injection, Carburetion & Fuel System 3 03-05-2006 02:18 PM


Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1967 - 1972 F-100 & Larger F-Series Trucks

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


Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »





All times are GMT -5. The time now is 04:56 AM.


Powered by vBulletin® Version 3.8.7 AC1
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. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup