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Yikes!

SaxMan

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I found out today what happens when a throttle return spring snaps. I was taking Baby Blue out for some exercise to a haircut appointment and then pick up a speaker I had to repair. On the way home, I took a back road when the car suddenly surged forward, like when I first got the car and was hitting the gas when I hit the brake. My right foot instinctively lifted, but the car kept going. Out of reflex, my left foot hit the clutch pedal and the engine wound up to 4500 RPM. At least I had an idea what I was dealing with. It felt like I had a stuck pedal and the gas pedal was not springing back. While trying to see if the pedal would come back, I alternated between putting the car in out of gear and braking. I finally cut the motor and pulled to the side.

When I popped the hood, the throttle linkage felt sloppy. Upon closer inspection, I found the culprit: Throttle return spring for the front carburetor was gone. Obviously, it must have snapped, and the rear return spring didn't have enough tension to take up for the missing spring. To limp home, I took the choke return spring and hooked it to the throttle. Success.

In retrospect, there were signs the spring was getting ready to go. Early in the drive, the carbs felt unsynchronized, which was quite odd, since they were close to perfect previously. The idle was rougher than usual, too. I'm going to go ahead and replace all the return springs so I don't have a repeat. It was a pretty scary moment. I'm just glad it happened on a fairly deserted back road where I had plenty of time and space to figure things out without endangering myself or anyone else.
 
There should be three springs. One for each carb and one for the throttle cable itself.
 
...and one for the choke? For a total of four?
 
Nope, the choke springs are part of the linkage assembly, they do not stretch down to the heat shield.
 
Poking around things tonight, I discovered when I hooked the carbs back up after the head gasket work that the choke cable was overly taut and even when the choke was fully pushed in, the choke was sticking slightly open. I'm guessing that probably had an adverse affect on gas mileage.

Just waiting on the springs and life will be good again.
 
New springs arrived, I put them in, readjusted the carbs and Baby Blue is happy again. Each time I do carb adjustment, I get just a little bit better than the previous one. Likewise, each time something goes awry with Baby Blue, it gives me a chance to make the car a little bit better with every fix.

Bonus: I did my test drives after the fixes at night with the top down around a few of the back roads near my house. Fireflies overhead look like shooting stars. That was just too cool.
 
New springs arrived, I put them in, readjusted the carbs and Baby Blue is happy again. Each time I do carb adjustment, I get just a little bit better than the previous one. Likewise, each time something goes awry with Baby Blue, it gives me a chance to make the car a little bit better with every fix.

Excellent! There's definitely something to the x-ray vision you will gain as you go through each system of your car. Bit of a pain now as you're getting everything to work correctly, but once you're ahead of it a little it will feel really good -- and you'll KNOW what your car is doing and how to keep it going. Well done!
 
New springs arrived, I put them in, readjusted the carbs and Baby Blue is happy again. Each time I do carb adjustment, I get just a little bit better than the previous one. Likewise, each time something goes awry with Baby Blue, it gives me a chance to make the car a little bit better with every fix.

Bonus: I did my test drives after the fixes at night with the top down around a few of the back roads near my house. Fireflies overhead look like shooting stars. That was just too cool.

Where did you get the springs? I just realized that I can't find mine
 
Where did you get the springs? I just realized that I can't find mine

Victoria British has them in stock. Very inexpensive. Under 2 bucks each...before shipping, of course.
 
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