Idle speed on Ford 250 carburetor

[snowbird]

Does anyone else have trouble getting the idle speed slowed down on the carburetor of the Ford 250? As you can see by the picture I've attempted to attach a pull spring, but unless I open the engine cover lid and push on the throttle linkage, it's way too fast. I'm also attaching a picture of the linkage in case that's the problem. I've already tried backing out the set screw that's supposed to determine idle speed.

 

[mkntrakes]

Re: Idel speed on Ford 250 carburetor

ck to make sure that the butterfly in carb is not caching on the gasket then take sping from lower linkage coming from carb and attach to exhaust manifold bolt

 

[Alaska Snow Cat]

Snowbird, the first thing I would do is remove all those springs as they are going to create more problems than they solve. Use only the stock spring location and make sure the spring is similar in length and tension as the original for best results. I would then remove the stock spring for trouble shooting purposes and with the engine off, move the linkages back and forth while looking and listening for worn out or sticking bushings or other parts. The problem could be any of a dozen or more situations involving worn or misaligned parts including mkntrakes suggestions. I've spent 27 years making a living as a mechanic and have worked on a lot of carburated equipment and the best advice I could offer regarding carbs is making sure all the adjustments are correct and all the parts are working properly as one little problem affects the performance of all the other little parts. Reengineering is not a good substitution for investigating and repairing in your situation. Best of luck. Randy.

 

[jo5]

You might also check to see if there is any thing under the foot pedal ( dirt floor mat rock etc)
also where the rod goes thru into the engine compartment may need some wd40
may have to readjust the linkage if the cag has moved
you could disconnect your linkage an see if that changes any thing (if you haven't already)

 

[snowbird]

Thanks bunches for all the suggestions. I didn't have the original throttle setup so I had to create one. I'll try to check out the owners manual and see if I can find a picture there to copy with original springs. Maybe some forum member could even post a picture of the right way to control the throttle.

 

[fr73ed]

Check for an intake manifold leak. That will raise your idle speed.
Check by spraying a little WD40, or similar flammable spray along any mating surface on the intake.

 

[Snowtrac Nome]

another place to look is the throttle cross shaft if the bushings are worn it will both bind and not let the throttlr close and cause a intake leak that combined with a rich mixture adjustment cause a high idle but i bet your problem is linkage adjustment or geometry