Throttle sticking after carb rebuild

[Notmikeb]

I believe the vacuum leak was present before the rebuild as many of the symptoms were present before (rough idle, flat spot in acceleration, slight rpm surging at idle) but it has gotten very much worse since the rebuild. I guess when you clean a dirty vacuum leak it just becomes a bigger vacuum leak

[marlinh]

So, where was the leak?

[Notmikeb]

Still haven't had a chance to diagnose yet. Had a three year old that refused to go to bed. Going out to check in a bit.

[Notmikeb]

At a loss. Can't find any vacuum leaks. Checked all the hoses and their routing. Tightened down the carb (was already fairly tight). Tomorrow I'll start going through each device one by one and start testing as per the FSM.

This is what my vacuum is doing at idle and at partial throttle

http://youtu.be/v9XC2Rh1MZM

Does this seem like a vacuum leak? Am I barking up the wrong tree here? Do I have another issue?

[irowiki]

Almost sounds like your throttle positioner is off or has a leak.

[Notmikeb]

It does the same thing whether the throttle positioner is connected or not.

[Notmikeb]

As an interesting note, I found a small ball bearing in one of the lines coming from the TVSV. And no, it didn't get sucked out of the carburetor as both fittings on either end are too small to have one this big pass through (not sure how that would happen even if they were). PO was trying to fix something but I can't imagine what.

[irowiki]

Which line exactly? He was trying to block it, but why?

[irowiki]

Check the choke opener and both diaphragms of the choke breaker next.

[Notmikeb]

It was the line from the k port to the "gas filter"

The car runs normally when cold and it first starts up and has a normal steady idle. The cycling rpms don't start until it's been running for a minute or two. This is leading me to believe the leak is somewhere in one of the systems that opens up when the engine warms up. I've got some new vacuum lines coming in today from Amazon so I'll start replacing them one by one and testing each system as I go.

[marlinh]

In the past I used to see ball bearings stuffed in the end of vacuum lines. I think people were trying to block off hoses but make it look like everything was still connected.

[irowiki]

Blocking off the line going from Port k to the gas filter would cause all kinds of poor running

[Gottolovem]

Years ago I had a car that refused to pass smog 1970 caddy
After talking to a friend of mine who is a mechanic he promptley walked out to the car in question poped the hood picked up a stick off the ground and shoved it into a specific vac line.
He said go see if it will pass now then replace the vac line "it passed"

[Notmikeb]

It seemed to make no difference once reconnected with a new hose. That makes me wonder if something in that series isn't operating correctly hence the original "repair".

[xirdneh]

is the primary solenoid working properly?