Will not stay running

Tiny
JOSEPH KYLE MOORE
  • MEMBER
  • 1970 FORD MUSTANG
  • 5.8L
  • V8
  • 2WD
  • MANUAL
  • 70,000 MILES
Hello everyone, so I went to crank up my car today after just getting back from basic training, put new gas in with some seafoam, and went to crank it. Had to of course jump it with my jump box and it will stay running only if I keep my foot on the gas the minute I let off it sounds like an automatic gun going off and shuts off if I leave it running without pressing gas it will crank then shuts off. Is it just fuel starved, carburetor need adjustment, I don't know.
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Tuesday, June 16th, 2020 AT 12:04 PM

19 Replies

Tiny
KASEKENNY1
  • EXPERT
I think you are on the right path that is most likely an air/fuel ratio issue however, if this engine is cold, it looks like the choke is wide open. Is that true or am not not seeing this correctly?

If the choke is wide open when the engine is cold then it is going to stall out. My father in law has a 1956 Lincoln and his starts and stalls just like this when the choke is hung open.

Before you adjust anything, see if you can release the choke and it shuts and then start the engine and do not use the accelerator and just see if it idles. If it doesn't then hold it with the accelerator so that it doesn't stall until it heats up and once it is warm if it keeps running then we need to adjust the carb and choke for cold operation.
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Tuesday, June 16th, 2020 AT 2:55 PM
Tiny
JOSEPH KYLE MOORE
  • MEMBER
Thank you. I shall try that when I get home. I should mention that it has been 90+ for a week here if that makes a difference.
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Tuesday, June 16th, 2020 AT 3:04 PM
Tiny
CJ MEDEVAC
  • EXPERT
Just for giggles.

What kind/type of fuel pump is on it?

Sounds like the carburetor to me.

Run your mix screws in (one at a time)

Count the number of turns (I like 1/4 to 1/2 increments so I can keep better track) Record the turns so that the numbers can be remembered.

When you hit bottom, just lightly touch it, going tight will ruin the seats.

Now back both screws back out to their original number of turns (which should be equal).

Give it a try.

Any better?

If not, back both out an additional 1/4 turn each.

Any better?

If not, put them back as they originally were, we will try something else.

The Medic
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Tuesday, June 16th, 2020 AT 3:09 PM
Tiny
JOSEPH KYLE MOORE
  • MEMBER
So tried holding the choke closed to no avail same problem. It is an electric choke if that matters.
I tried your method as well to no avail. The right side took 3 turns to be fully seated while the left side took 3 and 1/4 turns to be fully seated. I apologize for the late replies I truly appreciate your help.
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Wednesday, June 17th, 2020 AT 5:06 PM
Tiny
JOSEPH KYLE MOORE
  • MEMBER
It has also been converted to electric fuel pump. I have checked to make sure the fuel is flowing at a good rate and it is.
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Wednesday, June 17th, 2020 AT 6:34 PM
Tiny
CJ MEDEVAC
  • EXPERT
This may sound really dumb, but it will not hurt to try it!

Outside away from everything! Never can be too careful!

Always be ready with a soaking wet towel (a smothering throw), and a fire extinguisher as your last line of defense. Perform this outside. Just in case something bad might could happen when dealing with fuel.

Get a wash rag or similar rag.

Submerge it in water until it's thoroughly soaking wet.

Give it a little squeezing, just so its not so drippy.

With a little help, see if you can get up to about 2,000 RPM's. Maintain it for a few seconds.

Quickly cram and hold the wet rag over the carburetor throat let it die from 2000 to zero. (You may want to practice the rags "fit" before you actually perform the task) You want a really good rag seal on the carburetor when you choke it down.

The object here is to get the 2000 RPM's suction action to sort of vacuum out the inside of the carburetor/passages when you fully seal choke it out with the wet rag.

No that it is dead, it is really flooded!

Replace the breather (this will deter possible flames if something were to happen)

Hold the throttle down (fully open) and crank it, this should suck the surplus fuel on down the line and allow it to start.

I would try this once, but no more than two times. I've had good results doing this with my Jeeps, if something internal may have been blocked.

Any positive results?

The Medic
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Wednesday, June 17th, 2020 AT 7:33 PM
Tiny
JOSEPH KYLE MOORE
  • MEMBER
Finally got around to trying that today. After I did that it ran longer and I I thought it was fixed but shut off again. Then went back to doing the same thing. If I press the gas with the car off a few times it cranks right up and runs for a little while and shuts off. It runs noticeably longer the more I pump so I believe it to most likely be a fuel problem because of that but you are the expert. Just where my mind is at you know.
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Thursday, June 18th, 2020 AT 7:20 PM
Tiny
CJ MEDEVAC
  • EXPERT
Next thing to test might be the fuel pump output.

Take the fuel input line off of the carburetor, and put it into a jar (or something that will hold a half gallon and also be see-through).

Turn on the fuel pump for 30 seconds while monitoring your jar as not to overfill it.

Shut it off after the 30 seconds has passed (or if it gets too full!)

Without any specs for the electric pump, a mechanical pump should generate at least a pint of fuel in the 30 seconds.

If your electric pump is not pumping, at minimum, the same as a mechanical pump would do, you may have a pump problem.

My pic shows the test process, the pic is showing a mechanical pump (pic I had on hand).

Basic where? M.O.S?

The Medic
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Thursday, June 18th, 2020 AT 8:50 PM
Tiny
JOSEPH KYLE MOORE
  • MEMBER
I honestly couldn't remember if you said 15 or 30 seconds so I did 15 and recorded it. It did 8 fl oz in 15 seconds so 16 in 30 which is a pint. I've attached a video as well.
Lackland. 2A831. I enjoy it I really do. Airforce is probably one of the better decisions in my life, lol.
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Friday, June 19th, 2020 AT 2:19 PM
Tiny
JOSEPH KYLE MOORE
  • MEMBER
Fuel video.
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Friday, June 19th, 2020 AT 2:22 PM
Tiny
JOSEPH KYLE MOORE
  • MEMBER
So new development. It idles now but I rev it past a certain point it shuts off when it comes back down. Tuning?
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Friday, June 19th, 2020 AT 2:43 PM
Tiny
CJ MEDEVAC
  • EXPERT
Is the vehicle at operating temperature when it revs and still don't idle?

If it does get to operating temperature, then you do a quick throttle actuation, does the choke come off fully (the choke butterfly is now vertical--the choke is off).

We should not permanently adjust anything except at operating temperature/ choke is off.

Will it idle and get to operating temperature?

Keeping your mix screw recorded turns on hand. If nothing works below, put them back to the original settings!

You said 3-1/4 was the most. Get both to 3-1/4. (Back the right side out the extra 1/4 turn).

Try it. Results?

Bad results?

Back both out to 3-1/2 turns (1/4 turn more than it was)

Try it. Results?

Worse/ still not right?

Lets go the other way now. Take both back in to 3 turns (out from bottoming).

Try it. Results?

No Go?

Let's try 2-3/4

No go?

Put them back to the original positions.

My Pap Retired AF '54-'74. I was in the 4th grade then. By that age I had already gotten bit by the Jeep bug and was destined to be a paratrooper.

If the ole Ford ain't working out, Maybe I can sway you into a Jeep CJ!

The Medic
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Friday, June 19th, 2020 AT 5:34 PM
Tiny
JOSEPH KYLE MOORE
  • MEMBER
She works now. Going to get someone with a little more experience tune it a little better. I appreciate all your help and thank you for your service. Honestly about to sell it and by a Willy Jeep honestly, lol.
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Saturday, June 20th, 2020 AT 10:34 AM
Tiny
CJ MEDEVAC
  • EXPERT
So what (if anything) of what I suggested made any difference?

This would require a little bit of easy translating Jeep to 'Stang, it might save some fund-age. Basically its the same set up.

https://www.2carpros.com/questions/jeep-cj7-1985-jeep-cj7-stalls-when-hot

My 1st want was a Willy's, I found I did not have the time or place to fix one up. Most any that I found back in the 1980's needed major help and there was no internet for help. I got "Willy" in 1991.

I suggest a CJ 5 or 7 from between 1979 and 1981 as a daily driver, those were the years that everything was perfected and just before they ruined things with a computer and disposable aluminum transmissions.

The 5 or 7 will keep up in traffic and is better adapted for longer trips.

The Willy's is more of a pleasure/cruising vehicle (45-50 MPH) that not only will impress everyone else, but deep inside you will be impressed every time you think about/ drive/ or just sit and stare at him!

Let us know how the 'Stang works out, a pic would be nice too!

The Medic
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Saturday, June 20th, 2020 AT 3:03 PM
Tiny
JOSEPH KYLE MOORE
  • MEMBER
So when you told me to test the pump I continued to pump some more by accident and somehow the wire for the electric choke came off and it stayed in the position it was in the entire time which was about 2 inches from being closed. If it was completely closed it wouldn't stay running and wide open same issue. So I adjusted the screws again like you suggested and also took a piece of metal wire to all the jets just in case and it ran again. Currently in the process of converting from electric to manual choke like you suggested in your link.
I have a truck I daily drive the mustang is mostly just pleasure as is. Thank you so much for your help.
My wife wants a CJ 5 or 7 but I want a willy. Just something for the weekend you know. Might wait a little while for that though. This Mustang was a bit of a headache, lol.
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Saturday, June 20th, 2020 AT 4:13 PM
Tiny
JOSEPH KYLE MOORE
  • MEMBER
Your Jeeps look like pristine. I like the soft top like you have so you can just go cruising.
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Saturday, June 20th, 2020 AT 4:17 PM
Tiny
CJ MEDEVAC
  • EXPERT
Both types of Jeeps are still available.

Get her what she wants and she will gladly assist you with getting a Willy's!

I'm hoping you can get the 'stang going without spending a bunch of money!

Still no pic of yours!

One of my Jeep buddies (he has a 1942) drove his 1970 Mach 1 over yesterday so we could charge the A/C. It will never compare to a having a Jeep!

The Medic
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Saturday, June 20th, 2020 AT 7:24 PM
Tiny
JOSEPH KYLE MOORE
  • MEMBER
I swear I added it on the earlier post, lol might not have took. I love the blue on his.
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Saturday, June 20th, 2020 AT 8:25 PM
Tiny
KASEKENNY1
  • EXPERT
Good looking cars. By far my favorites of all muscle cars.
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Sunday, June 21st, 2020 AT 7:33 PM

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