CaliforniaSpecial.com -- Message Boards -- 1968 California Special Limited Edition Ford Mustang GT/CS
D I S C U S S I O N . F O R U M
COMMUNITY
1968 GT/CS & HCS
2007+ GT/CS
1966-1967 HCS

Vote!

Old 02/09/2019, 10:26 AM   #1
gtcs1
 

Location: Quebec, Canada
Joined: Jun 06
Posts: 332

Advice/help on carb hesitation, Vert 1973 351 Cleveland 2V

Hi,

Need avice on my carb. This is a 1973 351 Cleveland 2V Auto.

In regular acceleration or drive, at about 40-45 mph, there is an hesitation, where it kind of stall and engine won't go faster unless I press hard on pedal.

Normally, I would just release a bit the pedal and accelerate further then it goes above this zone OK.

If I was to press very hard acceleration right from the start, I may avoid this stall, but in regular smooth accel or drive in the 40-50 mph cruise it is there every time I pass up this 40-45 mph, where then i release and re-accelerate pass this 40 mph barrier.


In looking for solutions, I read about potential "carb pump diaphragm" cause. Before I start to get parts, any advice on this, for causes and fixes.

Thanks so much.

Pierre gtcs1

1968 GT/CS - Highland Green - C Code 289
1973 Mustang Convertible - Bright Green Gold Metallic - H Code 351-2V
gtcs1 is offline   Reply With Quote
Old 02/09/2019, 10:56 AM   #2
stangfan
 
stangfan's Avatar
 
GT/CS 8R01C150245

Location: Victoria, BC Canada
Joined: Jun 12
Posts: 1,514

My Garage
Might be too simple, but this sounds exactly like a 68 Coupe I used to own. It had a bad stumble when I was leaning into the accelerator coming off an idle. I put a bottle of gas treatment in the gas tank and sprayed carb cleaner into the carb a couple of days apart and the problem disappeared. I suspect it was a bit of gunk in one of the jets.

Steve Cracknell
stangfan is offline   Reply With Quote
Old 02/09/2019, 01:04 PM   #3
robert campbell
My Car Details
 

Location: Bremerton Washington
Joined: Apr 07
Posts: 4,044

My Garage
Pierre,
This sounds totally like accelerator pump failure. You are already going in that direction. Your accelerator pump diaphragm has a hole in it, is full of gunk, or the passages from the accelerator pump to the shooters in the venture may be plugged.

First thing is to take the air cleaner off and get a flashlight. Get something to lay on either over the massive fenders, or the long long nose of your Stang. Now climb up so you can look right down the throat of the carb with the choke flap open. Either have you lovely wife sit in the car and stab the throttle open, or work it with your third hand. One hand on the flashlight, one hand on the choke flap, and your foot opening the throttle in some sort of very weird yoga position.

You should see a strong shot of raw gas coming out of two small holes in what is called the "shooter". Down both throats. It should spray out in a nice thin solid line and not dribble out like an 80 year old guys "weiner".

Do this test and if you see just drips or nothing, you have found the problem. Post your results and we will go from there.

Rob
robert campbell is offline   Reply With Quote
Old 02/12/2019, 05:50 PM   #4
gtcs1
 

Location: Quebec, Canada
Joined: Jun 06
Posts: 332

Hi,

Thanks for the good advice. Look forward to test that. My car is currently in storage till 2nd of april. As soon as I bring it back home, I'll test that and advise. I was just getting ready to know which way to go for when I have access to it.

Winter is here and not likely to go away. One of the worst winter for few decades. Like if itsn't enough, tonight a snow storm has started and we expect 18" of snow till tomorrow afternoon.

1968 GT/CS - Highland Green - C Code 289
1973 Mustang Convertible - Bright Green Gold Metallic - H Code 351-2V
gtcs1 is offline   Reply With Quote
Reply

  CaliforniaSpecial.com Forums > GT/CS and HCS Forums > GT/CS and HCS Discussions

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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 Off

Forum Jump


All times are GMT -7. The time now is 05:11 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.


This site created, owned and maintained by Jon Hanna - Copyright 1996-2011
All rights reserved. CaliforniaSpecial.com is not affiliated with Ford Motor Company

ShowCase vBulletin Plugins by Drive Thru Online, Inc.