No cold start
Thread Starter
|
Freshman User
Joined: Apr 2009
Posts: 49
Likes: 0
No cold start
Hey can someone give me some advice. I have a 81 f250 I6. If I let it sit for a couple of days with out starting, then go to start it the engine will just turn over and not start unless I pour gas down then carb. Then it runs great. Now when I get it started it will turn off and start back up no problem through out the day. What is the deal.
Thread Starter
|
Freshman User
Joined: Apr 2009
Posts: 49
Likes: 0
Ok how do you check to see if the choke is closing? Also is the choke electric or mechanical? There is no wire to it so I assume mechanical? What is an acelerator pump?
Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
There is a plate on top of the carb that closes to reduce the amout of air, you will need to remove the air cleaner to see it. It's been years since I have seen an I6 carb, but if you dont have an electric choke, it may be controlled by a metal tube coming off the exhaust manifold. As the manifold heats up, the warm air travels up to the choke and allows it to open slowly. The accelerator pump shoot gas into the carb. When you step on the gas the accelerator pumps a stream of gas into the motor. How many times do you pump the pedal when you are starting it cold? When I had my 300, I had to pump that thing 9 times to get it to start.
Thread Starter
|
Freshman User
Joined: Apr 2009
Posts: 49
Likes: 0
There is a plate on top of the carb that closes to reduce the amout of air, you will need to remove the air cleaner to see it. It's been years since I have seen an I6 carb, but if you dont have an electric choke, it may be controlled by a metal tube coming off the exhaust manifold. As the manifold heats up, the warm air travels up to the choke and allows it to open slowly. The accelerator pump shoot gas into the carb. When you step on the gas the accelerator pumps a stream of gas into the motor. How many times do you pump the pedal when you are starting it cold? When I had my 300, I had to pump that thing 9 times to get it to start.
Never tried to pump the gas before starting only holding it to the floor. Just got this truck so don't know much about it.
Trending Topics
Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
Next time you try and start it cold, push the pedal all the way to the floor once and let go, then try to start it. One push should set the choke up and dump a little gas in the motor to help fire it up...if everything is working properly. If it happens to fire up for a second then die, do it again. If my truck has been sitting too long I may have to do this 2-3 times before it will stay running. Most motors are going to behave a little differently. If you do the one pump and nothing happens, try pumping it twice and try starting it. The only time you really want to hold the pedal to the floor is if you have flooded the motor with gas, in which case you can usually smell it. Holding the pedal down allows more air into the engine without adding extra gas.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread Starter
|
Freshman User
Joined: Apr 2009
Posts: 49
Likes: 0
Next time you try and start it cold, push the pedal all the way to the floor once and let go, then try to start it. One push should set the choke up and dump a little gas in the motor to help fire it up...if everything is working properly. If it happens to fire up for a second then die, do it again. If my truck has been sitting too long I may have to do this 2-3 times before it will stay running. Most motors are going to behave a little differently. If you do the one pump and nothing happens, try pumping it twice and try starting it. The only time you really want to hold the pedal to the floor is if you have flooded the motor with gas, in which case you can usually smell it. Holding the pedal down allows more air into the engine without adding extra gas.
Great thanks for your help. I pump it 5 times and it fires right up.
Postmaster
Joined: Jun 2007
Posts: 2,621
Likes: 1
From: Sweetwater Texas
Just don't tell anyone how to start your truck, I call it the original anti-theft device. My F100 took 3 pumps of the pedal and one more right after she fired up.
BTW, if you end up buying anymore carbed vehicles, 95% benefit from a couple of pumps of the pedal before you start them.
BTW, if you end up buying anymore carbed vehicles, 95% benefit from a couple of pumps of the pedal before you start them.
FTE Legend
Joined: May 2008
Posts: 56,542
Likes: 0
From: In my own world
the check valve in the fuel pump is bad, it allows the carb to drain back to the tank over a period of time. my 82 takes about 2 weeks. when you go to start it it has to fill the carb bowl up 1st. I don't mind it as long as the fuel pump functions properly otherwise. I just pump the heck out of it, while cranking until it starts.
Thread
Thread Starter
Forum
Replies
Last Post
Natcox012
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
8
Jun 20, 2014 12:25 PM
r_paetzold
1999 - 2003 7.3L Power Stroke Diesel
10
Feb 8, 2013 02:53 AM