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Stalling When Cold
#1
The 351C 4V quench starts fine in cold weather but after maybe 5 min
driving, the engine will stall at idle. After 5 min the electric choke has
come off so I don't think it is a choke problem. I was smelling gas
after shutting down the engine so I leaned out the choke and that
fixed the smell but the car still stalled. The intake is stock iron and
the Holley 770 has an aluminum spacer. The air cleaner is a bonnet
with K&N filter for cosmetic reasons. I am thinking I need to put the
stock air cleaner with heated snorkel back on, at least for the winter.
This is northern California but when need to scrape ice off your
windshield in the morning, it's cold.

mike

[Image: 1_11_11_13_11_50_27.png]
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#2
Does it continue to stall when hot, as in 10-20 minutes run time?
Does it want to stall only at:
- idle,
- in park or neutral,
- when just putting in gear, or
- when you're beginning to accelerate, too?

Pete - MotoArts Decals and Signs
'71 Sportsroof 351C-4V/4-speed - FINALLY under construction - no, wait, on hold again...
'90 Mustang 7-Up 5.0 ragtop, rolling beater
'66 Sunbeam Tiger Mk.IA, survivor
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#3
MotoArts;105188 Wrote:Does it continue to stall when hot, as in 10-20 minutes run time?
Does it want to stall only at:
- idle,
- in park or neutral,
- when just putting in gear, or
- when you're beginning to accelerate, too?

It only stalls when it has not had enough time to properly warm up.
My 8-10 minute drive to work after the choke is off is apparently
not long enough. It runs fine if I give it a little gas and I could adjust
the idle screw but then it would idle too fast once it has warmed up.
If we keep adjusting the carb, when the weather does warm up it
won't run right. Besides the electric choke there is probably a
reason Ford used a heated snorkel. I don't remember this being a
problem when I had a 670 cfm on it but now I have a 770 and the
new engine has a cam and is quench.
The engine runs great after warm up it's just that 5-10 minutes when
the temp is near freezing.

mike


mike

[Image: 1_11_11_13_11_50_27.png]
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#4
What is your engine temperature after 5 minutes?

Here in California, cold to us is 45 degrees. What is cold to you?

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
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#5
If you're talking bad idle only in the "transition" minute between 120-180* water temp, personally I'd leave it alone and 2 foot it to keep it running.
Or, the rough adjustment way would to simply dial a little tension back on the choke. Just a weeee bit, and see if that helps.
How about upping the primary main jet one size (small chance it may work only if the stumble is above idle)?
Is the manifold heat crossover functional?
Yes, you'll have to readjust come summertime. One of the reasons that modern fuel injection spoils us all.

I never had major troubles with carbed stuff in the cold, and that's in Pittsburgh cold... I always removed the flexy heat tube to the snorkel on all of my stuff, although it may have helped a bit.
Give 'er an extra 60 seconds warm up before departing... Cool

Pete - MotoArts Decals and Signs
'71 Sportsroof 351C-4V/4-speed - FINALLY under construction - no, wait, on hold again...
'90 Mustang 7-Up 5.0 ragtop, rolling beater
'66 Sunbeam Tiger Mk.IA, survivor
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#6
Another thought, does your vacuum advance on the distributor utilize the thermostatic control? This is the 3 outlet plug on the intake manifold, passenger side front.

If so, perhaps this is not functioning and giving you the proper advance once the engine is warmed up?

[Image: thread-under-the-hood-mysteries-distribu...trol-valve]

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
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#7
Wolverine;105285 Wrote:What is your engine temperature after 5 minutes?

Here in California, cold to us is 45 degrees. What is cold to you?

Never measured the engine temp but it gets warm enough for
the defroster to melt ice on the windshield in 5 minutes.
Where I live in California 25 would be considered cold.

mike

MotoArts;105311 Wrote:If you're talking bad idle only in the "transition" minute between 120-180* water temp, personally I'd leave it alone and 2 foot it to keep it running.
Or, the rough adjustment way would to simply dial a little tension back on the choke. Just a weeee bit, and see if that helps.
How about upping the primary main jet one size (small chance it may work only if the stumble is above idle)?
Is the manifold heat crossover functional?
Yes, you'll have to readjust come summertime. One of the reasons that modern fuel injection spoils us all.

I never had major troubles with carbed stuff in the cold, and that's in Pittsburgh cold... I always removed the flexy heat tube to the snorkel on all of my stuff, although it may have helped a bit.
Give 'er an extra 60 seconds warm up before departing... Cool

It is only a problem when the temp is in the 30's. At 50 or above it
is not a problem. I will probably put the heated working snorkel
system back on for now. The picture below shows a bonnet with K&N
filter so I am sucking too much cold air. The quench head with 770
Holley and "mild" cam is not happy in cold weather at least for the
first few minutes.

mike

[Image: 1_11_11_13_11_50_27.png]
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#8
Mike, Have you tried adjusting the fast idle speed screw associated with the choke? Chuck
http://www.holley.com/data/Products/Tech...-1rev4.pdf
page 9, figure 10. Just a thought.
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#9
My mustangs 4v ....cold blooded....I didnt dare put it into drive till it got past 140 or 150ish on the temp gage even if i was in a hurry...Or it would stall or buck like a pig..lol...I owned and drove it for 18 years now...And she was always cold blooded even with the dif carb i put on it later "thinking some issues was my carb anyways" Nope still didn't like to move till she was warmed up most of the way.
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#10
c9zx;105472 Wrote:Mike, Have you tried adjusting the fast idle speed screw associated with the choke? Chuck
http://www.holley.com/data/Products/Tech...-1rev4.pdf
page 9, figure 10. Just a thought.

The way the carb is now set up it idles about 1600 on startup.
Step on the gas to set the choke then start.
Are you suggesting I should set the fast idle to maybe 2000?

mike

[Image: 1_11_11_13_11_50_27.png]
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