Fast idle too Slow

[Anonymous]

I have a 1967 mustang convertible with a stock 200. I just had my carburetor rebuilt not too long ago and ever since then the fast idle cam doesn't kick on all the way in the morning. I'm pretty sure the carburetor I have is an original Ford replacement, (it says Motorcraft on it) that's what the carburetor guy told me anyway. If pictures would help for clarification, let me know and I can post some.

Any thoughts? Suggestions? I was thinking about bringing it back to this guy to have him fix it but if it's something simple, or at least relatively so, I'd like to just fix it and get it done.

Thanks, in advance, for any help you can provide.

-Sean

 

[ludwig]

Do you press the pedal all the way to the floor before starting? This pulls the adjuster screw out of the way so the cam can turn all the way. It might also be some drag in one of the moving parts. Clean up the exterior with carb spray and re-lube with WD40.
Cold start problems are the worst because as soon as it warms up you have a warm start and you cant get at the original problem.

 

[Anonymous]

I've tried putting the pedal to the floor and the carb has just been rebuilt, so it's all new and clean and lubed up. I've tried spraying it with lubricants too. It just doesn't come on all the way. Is there an adjustment for this?

 

[ludwig]

You may want to lengthen the rod from the throttle linkage to the throttle lever on the carb. It may also be that there is not enough pressure on the choke lever, if it is the choke we are talking about. If so, loosen the screws securing the black plastic chocke pull off spring and turn it clockwise to raise the pressure on the choke plate, counter clockwise to reduce the pressure.

It is possible that the choke spring (which moves the cam) has come unstuck from the anchor inside the little cap. The you will have to remove the cap and put the inside of the spring back in the little lug inside the cap. Or have your rebuilder do it.

 

[JackFish]

Perhaps the fast idle was never adjusted in the first place?

Make sure the fast idle screw is
1) There.
The only reason I say this is because I occasionally found mine sitting on the head.
2) Screwed in enough to bring the idle up. I don't think the rebuilder would be able to anything more than a relative positioning of the screw, he certainly couldn't fine tune it off the engine. It should be adjusted (when cold)with a tach connected.
I want to verify that you have checked before starting the car (when it's cold) that the butterfly is still open after popping the gas pedal to the floor.

 

[ludwig]

Word. This guy knows about cold starts. Eh?

 

[Anonymous]

Verified.

I'll check that screw thanks.