Hesitates when giving it the gas

Moderator: Mod Squad

Genenina1
New Member
Posts: 1
Joined: Sun May 27, 2018 4:16 pm

Hesitates when giving it the gas

Post #1 by Genenina1 » Wed Jun 13, 2018 6:38 am

Hi all. New member first post. I have a 68 convertible, 3.3L, 200 ci, 6 cylinder, automatic transmission. New autolite 1100 carb, new coil, new points, condenser, rotor and rotor cap, new ignition wiring pigtail. Curbside idle is set to 700 RPMs, timing is set to 12 degrees BTDC. My problem is a slight hesitation when accelerating slowly, to the point of stalling. If I punch the gas it will take off fine. I had the idle set to 550-600 RPMs but it would stall when taking off slowly, on a turn at a light in traffic for example. I've bumped the timing up to 14 and down to 10, both made it worse. I've gone down the road adjusting the idle fuel mixture screw a 1/2 turn every few hundred yards trying to find the sweet spot. I've gotten it the best that I can but it still slightly hesitates, almost like it's going to stall if I accelerate slowly. It would not be good in the neighborhood 4th of July parade for example. Any suggestions? I appreciate the help. Oh....and this is my wife's car....and she won't drive it unless it's trouble free. My car has a little more giddyup and go in it.

User avatar
bubba22349
Global Moderator
Posts: 8136
Joined: Sun Jan 03, 2010 4:46 pm
Location: Flagstaff, Az. 86005 near the old Route 66

Re: Hesitates when giving it the gas

Post #2 by bubba22349 » Wed Jun 13, 2018 8:37 am

Quote "Oh...and this is my wife's car...and she won't drive it unless it's trouble free."

:hmmm: I think first off if can you post some pictures of your engines Parts like the Carb, Distribitor, vacuum lines etc. This will help variafy that you have all the right combo of parts that a 1968 200 needs to run and drive trouble free. Good luck :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

User avatar
chad
Registered User
Posts: 3811
Joined: Sat Oct 24, 2009 9:51 am
Location: Lawrence Swamp, S. Amherst, MA

hesitates when giving it the gas

Post #3 by chad » Wed Jun 13, 2018 11:14 am

rather than 'poke'n hope' I would use bubba's great post on covering each step in good curb idle (AND this one on 'right components').
Otherwise U just attack whatever comes to mind. Mine sez "float'n needle'n seat", fuel filter (& on & on) but that's all speculation. Do the 8 or 10 steps correctly & the prob will show it'self.

W E L C O M E to the site AND the best forum here!
:thumbup:
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

Just_Fare
Registered User
Posts: 24
Joined: Wed Oct 25, 2017 8:37 am

Re: Hesitates when giving it the gas

Post #4 by Just_Fare » Wed Jun 13, 2018 11:33 am

I'm having a similar problem except that my Fairlane has a little hesitation if I give it more than half throttle. I've recently replaced the Autolite 1100 with a Carter RBS. The similarity between these two cases is a replaced carb so far as I can tell.

CZLN6
VIP Member
Posts: 3203
Joined: Fri Nov 15, 2002 11:07 am
Location: Idaho Falls, Id
Contact:

Re: Hesitates when giving it the gas

Post #5 by CZLN6 » Wed Jun 13, 2018 11:38 am

Howdy Gene:

And welcome to The Forum. Yes, it is that good.

After checking for vacuum leaks and electrical issues, my suspicion is that the accelerator pump is not functioning. How long since the carb was rebuilt? To check, remove the air cleaner and peer down the carb throat, with the engine off. With the choke butterfly open so you can see past it. Now watch for a squirt of gas while the throttle is being opened. You should see a strong squirt. A flash light is helpful. The accelerator pump is weak on these carbs and typically needs to be replaced every few years.

If the squirt is weak or none the solution is to do a carb rebuild. A rebuild kit typically runs $50 or so. It will include a new accelerator pump diaphram. There are several good videos on line to help you through the rebuild. IF your Autolite 1100 is in good shape, this is the way to go. Don't be fooled into thinking that buying a rebuilt carb is the way to go. Rebuilt carbs are usually a mix of parts. Cleaning, prepping and assembly is often questionable

Another thought, check to make sure that the vacuum advance in the distributor is working as designed.

IF you do need to replace your carb, consider an Autolite 1101 from a 1969 Mustang with a 250 engine. This carb is rated at 210 cfm. your carb, if original, is rated at 150 cfm.

Keep us posted on your findings and your progress. And again, welcome to The Forum.

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/

User avatar
wsa111
FSP Moderator
Posts: 2908
Joined: Sat Jan 24, 2004 5:28 pm
Location: South Carolina
Contact:

Re: Hesitates when giving it the gas

Post #6 by wsa111 » Wed Jun 13, 2018 1:25 pm

If you have fuel squirting out the pump nozzles, check the linkage & adjust hole location for the most discharge.
67 mustang,C-4, with mod. 80 hd, custom 500 cfm carb with annular boosters, hooker headers, dual exh.-X pipe, flowmaster mufflers, HEI dist. Engine 205" .030" over with offset ground crank & 1.65 roller rockers. 9.5 comp., Isky 262 cam.
2003 Ford Lightning daily driver. Recurving Distributors. billythedistributorman@live.com
Image

Just_Fare
Registered User
Posts: 24
Joined: Wed Oct 25, 2017 8:37 am

Re: Hesitates when giving it the gas

Post #7 by Just_Fare » Thu Jun 14, 2018 10:57 am

"check the linkage & adjust hole location for the most discharge"

How is this done? What specifically would one adjust? Though I'm not exactly sure where the fuel is coming out.

User avatar
bubba22349
Global Moderator
Posts: 8136
Joined: Sun Jan 03, 2010 4:46 pm
Location: Flagstaff, Az. 86005 near the old Route 66

Re: Hesitates when giving it the gas

Post #8 by bubba22349 » Thu Jun 14, 2018 1:35 pm

Check out the carb video's below, on accelerator pump and bench settings for that info. Good luck :thumbup: :nod:

Complete set of Autolite 1100 Carb rebuild, adjustments, and the carb trouble shooting, videos

Autolite 1100 Carb Teardown
https://m.youtube.com/watch?v=eAirfexkMVY

Carb Rebuild of the Float Bowl Assembly
https://m.youtube.com/watch?v=96wm8kcTAYI

Check ball placement
https://m.youtube.com/watch?v=uiOG__H2BM8

Autolite Float Assembly and Needle and Seat
https://m.youtube.com/watch?v=8bgc21iYKyY

Power Valve Repair
https://m.youtube.com/watch?v=R8XilvWkP3k

Power Valve
https://m.youtube.com/watch?v=i2eWyUbCtJU

Accelerator Pump
https://m.youtube.com/watch?v=1yp6SABzVG8

Premium Carb Kit Parts PK111
https://m.youtube.com/watch?v=BMMwVjVKbbg

Carb Kit parts
https://m.youtube.com/watch?v=ikZs5Nd9joE

Carb Kit 436
https://m.youtube.com/watch?v=n8L2RfnG_90

Flooding and Trouble Shooting
https://m.youtube.com/watch?v=QrvsdDucIXE

On the Carb Bench settings
https://m.youtube.com/watch?v=fVbZ1W1oNxA

Carb Settings
http://www.carburetor-parts.com/Autolit ... p_416.html

Vent Rod Adjustment
https://m.youtube.com/watch?v=uiOG__H2BM8

Choke Thermostat
https://m.youtube.com/watch?v=A9Tkb_hTlRI

Choke settings
https://m.youtube.com/watch?v=ZaDyq137YGI

Autolite 1100 Electric Choke conversion kit available from V.I.
https://www.vintageinlines.com/product- ... -choke-kit

New Universal Replacement Carb (these are available from V.I.) for the Autolite 1100
https://m.youtube.com/watch?v=UFRPh_TsluQ
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

User avatar
chad
Registered User
Posts: 3811
Joined: Sat Oct 24, 2009 9:51 am
Location: Lawrence Swamp, S. Amherst, MA

Re: Hesitates when giving it the gas

Post #9 by chad » Thu Jun 14, 2018 3:17 pm

EVERYthing U need cept the tools
Thanks Bubba!
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

CZLN6
VIP Member
Posts: 3203
Joined: Fri Nov 15, 2002 11:07 am
Location: Idaho Falls, Id
Contact:

Re: Hesitates when giving it the gas

Post #10 by CZLN6 » Fri Jun 15, 2018 10:47 am

Howdy All:

WOW Bubba! Where was all this info back in the early '90s when I tore into my 1100. I tried searching on my first Apple 2e computer. "We've come a long ways, Baby!"

Thanks for compiling the list, Bubba. I hope it is made into a "Sticky".

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/

Who is online

Users browsing this forum: No registered users and 10 guests