|
Author
|
Topic: Stalling at acceleration
|
Bailey66
Journeyman Posts: 6
From: Louisville, KY, USA
Registered: Apr 2003
|
posted 04-30-2003 09:54 PM
 
New to the world of car work, so I have a question that is likely very simple.
I have a 66 coupe with inline 6.
I recently had to install a new carb. Both cold and warm idle seem fine. However, whenever I accelerate while driving, the engine stalls a bit, seems like it wants to die, then kicks back in. A choke problem? A timing problem? Any suggestions on what adjustments should be tried will be greatly appreciated.Richard
|
1_ZoNiE
Gearhead Posts: 866
From: Arizona - M&M Member No. 1968 & Owner/Driver of a 1968 Mustang Coupe! ~Happiness is Matching Numbers~
Registered: Mar 2002
|
posted 05-01-2003 12:37 AM
Have my doubts it could be a timing problem. It's not backfiring through the carb is it when you accelerate on a roll? First thing I would do, would be to check to see if the choke was open when it reached operating temperatures. Does it stumble from a standing start? If it does then you may need to adjust the accelerator pump to give a little more squirt to compensate for the amount of air entering the engine when the throttle is opening. But, first check the choke! ------------------
Jim 68 Mustang Coupe...My Show Car.
Winning over 60 "dust free" awards!
|
aGreenAgent
Gearhead Posts: 148
From: Orange County, CA
Registered: Oct 2002
|
posted 05-01-2003 12:46 AM
It does that to me. It's an inadequate pump shot I believe. The guys will tell you more.
|
Bailey66
Journeyman Posts: 6
From: Louisville, KY, USA
Registered: Apr 2003
|
posted 05-01-2003 01:27 AM
Thanks. Yes, the choke is open at operating temperature. So, I will check the accelerator pump and try to adjust it. Again, thanks.Richard
|
1_ZoNiE
Gearhead Posts: 866
From: Arizona - M&M Member No. 1968 & Owner/Driver of a 1968 Mustang Coupe! ~Happiness is Matching Numbers~
Registered: Mar 2002
|
posted 05-01-2003 09:28 AM
Let us know what you find out.------------------
Jim 68 Mustang Coupe...My Show Car.
Winning over 60 "dust free" awards!
|
Bailey66
Journeyman Posts: 6
From: Louisville, KY, USA
Registered: Apr 2003
|
posted 05-01-2003 09:13 PM
Jim,I adjusted the accelerator pump a bit, but no noticeable difference. So, I decided to fiddle with the choke adjustment to see if any change. I did notice a little better response as I turned the choke cover for a leaner setting . Though still stumbling when accelerating hard, especially between say 30-50 mph. I guess I will mess with the choke adjustment a bit more tomorrow? Richard
|
Bailey66
Journeyman Posts: 6
From: Louisville, KY, USA
Registered: Apr 2003
|
posted 05-01-2003 09:45 PM
One other thing I wondered about on this issue--what are the chances it could be the fuel pump?
|
66project
Journeyman Posts: 25
From: Abilene TX USA
Registered: Jan 2003
|
posted 05-01-2003 09:56 PM
My 289 did the exact same thing a few years back after the smog Nazis messed with my Carb's needle valves. It turned out to be a mixture problem...and after painful hours of messing with the mixture, choke, and idle adjustments (what a pain on a 30 yr old 4 barrel Holley!), I was finally able to get things running smoothly again.
|
N266fords
Gearhead Posts: 1662
From: Sierra Vista ,Az USA
Registered: Apr 2003
|
posted 05-02-2003 01:46 AM
Even though it was rebuilt dont rule out a blocked port in the carb! also what is your fuel preasure and is it a clocked fuel filter does it do it under light accel or under full ? Bruce
|
Bailey66
Journeyman Posts: 6
From: Louisville, KY, USA
Registered: Apr 2003
|
posted 05-02-2003 09:54 PM
Pretty much only does it under full acceleration.
|
BlueMule
Gearhead Posts: 1781
From: Kent Island, MD USA M&M # 2423
Registered: Sep 2002
|
posted 05-03-2003 12:01 PM
Welcome to M&M...
Is the car actually dying and falling on it's face or is it acting like it can't get out of it's own way (kinda like a chebby  ).
You may want to verify that the vacuum advance source is in the correct port. Another thing to check is the functionality of the vacuum advance on the distributor. I had one fail once and the engine wouldn't wind up worth a hoot. It also proved to be one of those impossible to find vacuum leaks.Just a few thoughts... ------------------
-Paul 70 Mach1 351C
79 Ranchero GT
97 Expedition XLT 5.4
00 SVT f150 Lightning 4149 of 4966 Born on: 06/26/2000 'life's tough... it's tougher if you're stupid.' [This message has been edited by BlueMule (edited 05-03-2003).]
|
indyphil
Gearhead Posts: 3394
From: Senoia, G.A. USA
Registered: Jul 2002
|
posted 05-05-2003 09:40 AM
I second the idea to check fuel filter and fuel pump. Old cars like these have rusty fuel tanks and clog filters easily. I just changed my tank because of this. The old tank had 35 years of crud in it, including some small pebbles. I have a pop open gas cap so some kids at some time in the cars history probably thought it would be funny to put stuff in there. ------------------
'68 coupe 289 C code
66 heads, edel 600cfm carb, performer intake, dual exhaust
|
RonnieT
Gearhead Posts: 912
From: Port Allen, La. 70767
Registered: Jun 99
|
posted 05-05-2003 09:47 PM
The 351W in my 69 mach1 did the same thing you are describing, it would run good with a lot of initial timing, but when I set the timing anything below 14 degrees it would fall on it's face when i hit the throttle hard. The cure for it was a new carb, I never did take the old one apart, but figure it was a vacuum leak around the throttle shafts. I just read your post again and see its a 6 cyl, I think that this is a common problem with the 1 barrel carbs, Pony Carbs talks about correcting these problems when they restore these carbs. From: http://www.ponycarburetors.com/restore.htm#autolite1100 AUTOLITE 1100
The 1100 is one of our specialty products. The day the carburetors were manufactured they had engineering problems, and in-driveability, those problems were hesitations and flat spots on acceleration, a general lack of power, and hard starting when hot. We correct all of those problems during the restoration by re-engineering the interior specifications of the carburetor.
------------------
Ronnie
69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23
|
Bailey66
Journeyman Posts: 6
From: Louisville, KY, USA
Registered: Apr 2003
|
posted 05-05-2003 10:59 PM
Thanks for all the suggestions guys. I am still working through a few things. Actually, have Napa ordering a Holley 1946, as well, to possibly exchange the 1100 for it. Again, thanks for all the helpRichard
|
