Cold Starting Question
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Cargo Master
Joined: Sep 2004
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Cold Starting Question
Its been in the single digit temps the past two days and she almost wouldn't start. After starting she still runs cold due to the cold air out there.
My rig still has the stock sheet metal tubing that connects the air cleaner to the exhaust manifold but the flap actuator is not working. I had to have one of those replaced years ago on an Escort so it would run better and I'm pretty sure I need one for my 72. What are those things called and where can I get one?
My rig still has the stock sheet metal tubing that connects the air cleaner to the exhaust manifold but the flap actuator is not working. I had to have one of those replaced years ago on an Escort so it would run better and I'm pretty sure I need one for my 72. What are those things called and where can I get one?
Junior User
Joined: Jul 2010
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It's called a heat riser. Gives the engine warm air from the exhaust manifolds to help with cold weather running. After the engine is warmed up the flapper allows fresh unheated air into the engine. They have a temp vacum switch that is mounted in the air cleaner to operate it. You don't want it on all the time because fuel mileage will suffer. It's main purpose is to help get to that point or stay on as needed.
Posting Guru
Joined: Oct 2006
Posts: 1,761
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From: Bethel,Ak
I do not have the stock aircleaner on my 68.
But with the biggest Cold Cranking Amp battery that can fit and 5w30 oil she start right up even in negative temps.
Then we stick a weight on the throttle to keep the rpm's up a little to help her warm up.
Cardboard in front of the radiator helps out also.
But with the biggest Cold Cranking Amp battery that can fit and 5w30 oil she start right up even in negative temps.
Then we stick a weight on the throttle to keep the rpm's up a little to help her warm up.
Cardboard in front of the radiator helps out also.
Posting Guru
Joined: May 2001
Posts: 1,395
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From: Cupertino
Qman, a broken flapper is not going to affect starting.
Check the throw on the accelerator pump- maybe increase it- and try tightening up the choke a little more.
Although most of the guys seem skeptical, I am a fan of higher octane fuel in very cold weather to help starting. Worth a try.
Check the throw on the accelerator pump- maybe increase it- and try tightening up the choke a little more.
Although most of the guys seem skeptical, I am a fan of higher octane fuel in very cold weather to help starting. Worth a try.
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Cargo Master
Joined: Sep 2004
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Maybe I used the wrong title for this thread. I wasn't really complaining about the cold starting. It was hard to start but it starts.
I am complaining about the rough running. It never warms up. When I met my wife she had an Escort and one cold winter ice would form on the carburetor throat and it would run rough just like my truck does. If I sat there for a few minutes everything would warm up and it would run good again. Take off and it would run rough again. The dealer figured out it was that stupid flap. Had it replaced and all was well again.
That flap is wide open on my truck and I think I need one. It runs fine when it's warm out.
Count me as skeptical on the high octane fuel. Octane rating is nothing more than a fuel's resistance to pre-ignition. The higher the number the higher the resistance. A higher compression engine needs a higher octane fuel so the stuff doesn't ignite too early. You're throwing away cash putting higher octane fuel in these old rigs. That fuel is less likely to burn than the lower octane stuff. It still burns fine though.
I am complaining about the rough running. It never warms up. When I met my wife she had an Escort and one cold winter ice would form on the carburetor throat and it would run rough just like my truck does. If I sat there for a few minutes everything would warm up and it would run good again. Take off and it would run rough again. The dealer figured out it was that stupid flap. Had it replaced and all was well again.
That flap is wide open on my truck and I think I need one. It runs fine when it's warm out.
Count me as skeptical on the high octane fuel. Octane rating is nothing more than a fuel's resistance to pre-ignition. The higher the number the higher the resistance. A higher compression engine needs a higher octane fuel so the stuff doesn't ignite too early. You're throwing away cash putting higher octane fuel in these old rigs. That fuel is less likely to burn than the lower octane stuff. It still burns fine though.
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Senior User
Joined: Jul 2003
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From: Las Vegas
T would be helpful to have a vacuum schematic for your OEM setup. I believe the part in the air cleaner is the vacuum motor and the switch may be part of it or not. Some Ford engines have the switch in the thermostat housing or intake manifold. I suspect the motor not the switch. You can check the motor/part that moves the flap, by disconnecting the hose to it and closing it by hand and putting your finger over the inlet. If it stays closed or tries to stay closed the motor is likely OK. Your finger may not seal well, so you may want to try a piece of electrial tape, when plugged tightly it should stay open. If not it's bad. Also check all vacuum hoses for cracks/leaks.
Just My $.02,
Gene
Just My $.02,
Gene
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Cargo Master
Joined: Sep 2004
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Thanks jow. Do you get minus zero temps? My story about the flap on my wife's Escort is truer than snot. I didn't even know what that thing was til it was replaced.
And when it comes right down to it. How do you adjust a choke? I followed the instructions that came with my carb kit but didn't really understand what the heck I was doing.
And when it comes right down to it. How do you adjust a choke? I followed the instructions that came with my carb kit but didn't really understand what the heck I was doing.
Elder User
Joined: Jan 2008
Posts: 618
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From: central oregon
when it was 20 below zero . all i did was pull the manual choke close crank an pump the gas an she fired off . when i put the edelbrock manual choke carb on i just made sure the choke closed all the way . it was real simple . i don't now about electric choke never had one.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Thanks jow. Do you get minus zero temps? My story about the flap on my wife's Escort is truer than snot. I didn't even know what that thing was til it was replaced.
And when it comes right down to it. How do you adjust a choke? I followed the instructions that came with my carb kit but didn't really understand what the heck I was doing.
And when it comes right down to it. How do you adjust a choke? I followed the instructions that came with my carb kit but didn't really understand what the heck I was doing.
I'm sure there are plenty of others that can splain carb setups better then me.
John
Posting Guru
Joined: Oct 2006
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From: Bethel,Ak
When it hits -20F is when my 68 gets plugged in.
Have a edelbrock carb/intake with manuel choke.
Close the choke and pump the pedal a couple of times and she starts right up.
All the 68 gets is 85 octane.
Always gets a tune up in the fall.
All i have done is make sure the choke is closed all they when i pull the cable.
When's the last time yours had a tune up?
Have a edelbrock carb/intake with manuel choke.
Close the choke and pump the pedal a couple of times and she starts right up.
All the 68 gets is 85 octane.
Always gets a tune up in the fall.
All i have done is make sure the choke is closed all they when i pull the cable.
When's the last time yours had a tune up?