Hot Rod Forum : Hotrodders Bulletin Board - Reply to Topic
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine> 289 runs rough all of a sudden
User Name
Password
lost password?   |   register now

Thread: 289 runs rough all of a sudden Reply to Thread
Title:
  
Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
08-12-2012 09:58 AM
harris66 I had this problem 3 weeks ago.

The positive wire to the electric choke was bad and it was flooding. I had to constistantly feather the petal and most times off the line i had to let it idle up to speed before applying any gas (funny sight to see!).

Anyhow, changed the wire, choke works now just fine. Just have to retune the carb to get rid of a surge at crusing speed.
09-25-2006 09:26 AM
StangIN65
Update

For any that may be interested....
I experienced and perfomred my first carb rebuild on Sat. I Picked up a kit and an extra set of carb to intake gaskets. Carb removal was easy, I placed a clean rag in the intake and took the carb to a table I prepared especially for this occasion. I did not rally have a good set of instructions or diagrams that came with the kit but managed to muddle through it by carefully laying each piece out so that they would not end up in the wrong place. "I still managed to mix up a critical set but figered it out later." Anyway I went through 3 big cand of card cleaner 1/2 gallon of solvent and two old toothbrushes and got her cleaned and back together. I did not swap the jets or needle valves as the required a braod screw driver and I was afraid to bugger them up. Well all told it certianly ran better with about a pound of crud off of it. I still need to adjust her back in as she is a little rich right now and my kgarage pass expired with the wife late Saturday night. However it was almost extended when she tossed me a sleeping bag.
I took the time to reset the points and finally got her to idle right. If I get another garage pass I plan to set the inlets, choke, timimg and slow idle.
Wish me luck I seem to be making progress.
09-20-2006 07:03 AM
StangIN65
Carb?

Quote:
Originally Posted by FEDDO
Years ago ,and in another life, I had a similiar problem with a 64 fairlane. tried different carbs, points, cond. no help. Carried a friend for a ride, and he said its the dist plate. there is a plate in the dist that the points attach to. I changed that and all of my car problems were solved. had my friend back.if you can't find one I have a spare. hope this helps. jim.
Jim that is very thoughtful of you and I may take you up on the offer. I have a gut feel that it is not the carb. I have felt it was a "governor" type of feel and since the dist is the governor I have had a suspicion that it could be in the dist. This weekend I plan to do two thing prior to a carb rebuild. (If I have to rebuild it would be during the non-driving season.) One is to remove the plate and inspect it. The second is to replace the carb to intake gasket to allow for a more thorough inspection of the carb and if it is the source of an intermittent vac leak. I will let you know what I find out.
Cheers
09-19-2006 04:26 PM
FEDDO
carb?

Years ago ,and in another life, I had a similiar problem with a 64 fairlane. tried different carbs, points, cond. no help. Carried a friend for a ride, and he said its the dist plate. there is a plate in the dist that the points attach to. I changed that and all of my car problems were solved. had my friend back.if you can't find one I have a spare. hope this helps. jim.
09-19-2006 07:17 AM
StangIN65
Thanks Falcon Sprint

I pretty much surmised that would be my next step. I have to track down the right Intake to carb gasket and I have asked Eldebrock for their recommendation. I know the carb need a good cleaning as I can visually see corrosion on the secondary throttle plate. Last spring the only thing I replaced was the primary gasket and plunger. The dog gone thing ran great.

I rode the horse into work today and she seems to surge and stall over a complete cycle. I am sure this is attributed to my current set of adjustments. Finding the rebuild kit is not a problem nor is my capacity to perform the cleaning and refurbish. I just have a haunting in the back of my mind that this is not it. But then donít we all have doubts.
09-18-2006 08:14 PM
65 falcon sprint
carb.

if there are no vacuum leaks,then its probably the carb,kinda sounds like the accelerator pump in the carb is starting to go bad. after doing everything you have done up to this point,rebuilding the carb. would be my next move.good luck neil
09-18-2006 02:11 PM
StangIN65
Latest Update

Fuel pressure is good. Tested it by pulling the line and letting her squirt into a can. I had about a pint after 30 seconds or so. Thats the best check I could perform. Got the ol mare up to operating temp and had my dad help keep her going while I sprayed card cleaner around the carb with not change. Then we shut her down and counted the turn all the way in for the two bowls and wrote that down. After a while we got her to idle with about a 1 turn gain on the drivers side, no change on passenger side, a tweak up on the timing and with by setting the idle up.
Now.....
It is better and I can keep it running but it is not smooth as it was before the whole thing happened last week. I am going to yank the carb and swap the gasket as soon as I am sure of the right gasket. Edelbrock Torker II with a Motorcraft 4100.
Any other thoughts, opinions, ideas, hopes or prayers?
09-11-2006 07:31 AM
StangIN65
Fuel Pressure

I have not measured it. (don't have the equipment) I started to write that I think that it is ok becuse I get good revs higher up but no idle. But on second thought I am wondering if the pressure was low at idle becuse perhaps the fuel pump was not delivering enough pressure at that one particular point in the cycle of the engine. I would hate to buy a new pump if I didn't have to. I suppose I have a pump on the 302 of another car I am building that only has about 50 mile on it. I suppose for the cost of a gasket I could try it.
09-11-2006 07:23 AM
nitro_baller4692 whats the fuel pressure like?
09-11-2006 07:13 AM
StangIN65
This is the carb except with automatic choke

Here is a tech link I found
http://www.mustangmonthly.com/techar.../photo_01.html
09-11-2006 07:06 AM
StangIN65
Update

Ok the trek home was ok she only died once on me and started back up. Here is what I have learned. First it is a Motorcraft 4100 not a 4300. Second I discovered that the choke plate became disconnected from the choke spring. I corrected that but alas that was not the problem. I cleaned the PVC valve and blocked off the vacuum advance to the carb and distributor. No change what so ever. Perhaps this may describe the symptom better. The engine tries to idle but at a certain point I have to lightly apply a little gas then it gets back to that same point in the cycle and I have to do it again. She almost wants to idle but not quite. I have removed a few plugs 1, 5 and 3 they have a little carbon on them and I attribute that to the choke being set a little rich. Overall the engine runs strong provided I keep giving her gas. Stop lights are a big problem, one foot on the clutch, one on the brake and one on the gas. Only problem is I only have two feet.
Any other Ideas are appreciated.
09-09-2006 08:55 AM
trees I would check for a vacuum leak. Could be a hose or even at the base of the carb. There were two different shapes of carb bases and intake bases, referred to as round back and straight back. All will bolt on and rebuild kits include both gaskets. Spraying some carb cleaner or starting cleaner around the back base of the carb will smooth out the idle if that is your problem (or any other place it could be sucking air)

Having said all this, you may have to clean/rebuild your carb. I had the same symptoms on my 68 Bronco 289 and a rebuild solved the problem. We also ran into a round back carb on a square backed intake on my Bud's daughter's 66 Mustang. He milled an aluminum plate and used both gaskets in the kit to solve that problem.

Trees

Trees
09-08-2006 06:43 PM
bates_k
Is it misfiring...

through the carb?? Kinda sounds like a sneeze...
You could have a vacuum leak...

K
09-08-2006 02:07 PM
nick69 hope the trek goes ok. Also check the fuel filter for debris.
09-08-2006 02:04 PM
StangIN65
289 runs rough all of a sudden

I have an autolite 4300
It does not smoke at all. I always have it clean and I know it probably better than any other motor component. I am about to try to get it home on a 13 mile trek. I will give the carb a good goin over tomorrow and let you know what I have or have not figured out by Monday
Cheers
This thread has more than 15 replies. Click here to review the whole thread.

Posting Rules
You may post new threads
You may 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 Off


All times are GMT -6. The time now is 06:22 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.