High Idle Speed After Carb Rebuild Autolite 1101 Vaporizer

[RyanCorpse]

I just rebuilt my Autolite 1101 Carburetor from Pony Carbs [bought 2 years ago] (no scv+running DSII). I bolted it back on and it's idling pretty high and adjusting the Mixture Idle screw has no effect. I'm sure I didn't mess up the timing because I didn't move the distributor at all.

The reason why I rebuilt the carburetor was due to the previous brass float springing a leak inside. I purchased a new float along with a rebuild kit.

To set the float, I used the paper ruler shaped like an L from the rebuild kit. The instructions state that the proper metal float level is 1 3/32" of an inch which is 27.78mm. So I got my digital caliper out and cut the smaller part of the ruler to the stated size. I set the cut portion on the upside down and measured the float level.

I did not adjust anything else other than the float and the Choke (AUTO) IDLE MIXTURE and IDLE SPEED screws.

I bolted the Autolite 1100 (from Pony Carbs purchased 2 years ago) and it started right up, but with a really high idle. I tried adjust the Idle Mixture Screw but it did nothing at all to lower the RPMs.The engine would still run strong with the Idle Mixture screw nearly threaded all the way in.

What are the reasons why it's idling so high?


I just found out this is the wrong section for this topic. Can I move this thread or start a new one in the proper section?

 

[bubba22349]

You may have to reset the float again. Too high a level will cause it to idle higher.

 

[RyanCorpse]

Too high of a float...means that the float is letting too much gas in?

Hm...I measured exactly the size it specified.

I'll remove the carburetor tommorow morning and post detailed pictures of the measurements.

(I don't have any drill bits.)

 

[bubba22349]

Okay pictures will help. But sometimes even with the right measurement the actual fuel level can be too high or too low (wet fuel level)

 

[RyanCorpse]

I did notice the top carburetor gasket wet with fuel...Hoping that might be the problem. I'm hoping it isn't a vacuum leak or anything. Does spraying starter fluid/WD-40 around the intake manifold still work for finding the leak?

 

[bubba22349]

Top gasket being wet is sure sign of fuel level being too high or a needle that isn't sealing against the seat. Yes that will work to find vac. leaks.

 

[Explorer]

Cap off any vacuum lines to carb when looking for leaks. This will isolate any leak to the carb. Vacuum canister on distributor, line to tranny, if it's an automatic, are two good sources of leaks.

 

[RyanCorpse]

Good to know, I'll be heading down in a few minutes and do a vacuum leak check.

 

[RyanCorpse]

Just got back from an hour drive!

Turns out the Curb Idle Speed screw was the culprit causing a really high idle. The top gasket hasn't gotten as wet now that I've adjusted it.

I set the idle mixture screw about 1 1/2 turns - 2 turns out from it being lightly seated.
For the curb idle, I kept it at the high idle speed it was at and then slowly screwed it out until the rpms sounded smooth and reasonable. Took it out for a drive and it was a beauty.

 

[bubba22349]

Good deal