1964 FI Choke Issue

[Patrick C.]

[Don H.]

Re: 1964 FI Choke Issue

Pat, I don't have any ideas (hopefully others will) but I wanted to share that I experienced the same thing with a carburetor "manifold heated" choke, even going so far as to replace everything with new parts - it came back. That combined with my experience with the earlier electric fuel injection chokes (working great for a long time) makes me wonder why they went to the manifold heated type choke in fuel units??? My guess is cost. Don H.

[Patrick C.]

Re: 1964 FI Choke Issue

I am mot sure if it makes a difference but I have been running AV 100LL fuel? I warm it up and drive it 20 to 40 miles everytime I start it up.

[Bill W.]

Re: 1964 FI Choke Issue

Pat,
The hot air tube that goes through the exhaust manifold then into the choke housing is probably rusted through allowing exhaust gas into the choke. Also for local help call Scott Pfuehler (pronounced Fuller) at (918) 437-5292. Tell Scott I said "Howdy! Bill

[Patrick C.]

Re: 1964 FI Choke Issue

Pat,
The hot air tube that goes through the exhaust manifold then into the choke housing is probably rusted through allowing exhaust gas into the choke. Also for local help call Scott Pfuehler (pronounced Fuller) at (918) 437-5292. Tell Scott I said "Howdy! Bill

Bill, the choke tube was new when the 380 fuel unit was rebilt last year....i know Scott well, he rebuilt the fuel injection unit and has helped me getting the car ready for judging.

[Alan D.]

Re: 1964 FI Choke Issue

Well not from the 100LL, I run it also & have never seen any rust in choke. You are typically running your car longer then me.
de rust the spring and disk, plate/paint the disk & spring and watch. Do you have high humidity in garage?

[Patrick C.]

Re: 1964 FI Choke Issue

Well not from the 100LL, I run it also & have never seen any rust in choke. You are typically running your car longer then me.
de rust the spring and disk, plate/paint the disk & spring and watch. Do you have high humidity in garage?

Alan

i will have to check the humidity in the workshop. Its air conditioned and heated but thats only on when I am working out there. This is Tulsa, so humidity is naturally high in the summer months but I have not seen any unusual rust any where else. I derusted the spring, plate and piston linkage and I will paint the plate and put the rest back together as soon as I find a choke plate gasket. I am hoping its the same as some of the carb choke gaskets. I am also concerned about the butterfly shaft as it seems a little sticky so I am going to work on that also.

[Duke W.]

Re: 1964 FI Choke Issue

Coating all the interior parts with WD-40 may help.

Duke

[Michael J.]

Re: 1964 FI Choke Issue

Something seriously wrong there, I have never seen a new choke and spring get so rusted so fast.

[Patrick C.]

Re: 1964 FI Choke Issue

Something seriously wrong there, I have never seen a new choke and spring get so rusted so fast.

Michael,

Me too. The car runs so good however. Idles and drives great, plenty of power and smooth cruise. pulls strong from low RPM without a miss. It even starts easy when you use the correct proceedure. Somehow its getting moisture inside the choke housing. The car does run on the cool side at 180 to 195. It has a new Dewitts radiator however and 180 degree themostat.

[Duke W.]

Re: 1964 FI Choke Issue

Pat,
The hot air tube that goes through the exhaust manifold then into the choke housing is probably rusted through allowing exhaust gas into the choke. Also for local help call Scott Pfuehler (pronounced Fuller) at (918) 437-5292. Tell Scott I said "Howdy! Bill

...most likely root cause.

Duke

[Patrick C.]

Re: 1964 FI Choke Issue

Maybe I am missing something or misunderstood how this system works. Tube is less than a year old. It goes from the hole in the exhaust manifold to the choke housing. I thought warm exhaust gas heated the tube causing the spring to expand and take off the choke? I thought exhaust gas had to travel up to the choke housing? Where would it rust through...help me understand.

[Chris D.]

Re: 1964 FI Choke Issue

You are missing a piece of the puzzle. The tube you have in mind runs from the manifold to the choke housing. That manifold hole has an additional tube inserted going all the way through the manifold to allow fresh air to be heated. Not supposed to pass exhaust gas. But, when it rusts through, it does. Could be your issue.

[Dan D.]

Re: 1964 FI Choke Issue

Pat, it is not hot exhaust gasses. The tube in the manifold, which is stainless, passes through the manifold, and comes out on the bottom of the manifold where another tube brings it up topside near the dipstick where a short piece of rubber hose connects it to a fitting on the air meter adapter. With this setup, only filtered air enters the choke housing. They did it right.

If you don't have this connection, then that is your problem. These parts are available in the aftermarket, and some of our suppliers have good exploded views of this setup on their websites. These parts are not expensive. I can send you photos if you like. I have bought this setup recently for my car and it fits and works good.

-Dan-

[Patrick C.]

Re: 1964 FI Choke Issue

I pulled the choke tube out and the picture is below. The tube is clear and not plugged.

Looks like I maybe missing another tube inside the manifold? Can I check this without pulling the manifold?