carb and throttle questions

[cardogman1]

I don't know if this is the correct forum to ask these questions but here goes.

Someone just told me that the pictured diagram on the top of the air filter cannister is wrong at least on the 71 Z. The actual Idle adjustment is the larger screw on top of the throttle linkage and the two screws one on each su are airblead screws. Those ar the two screws I believe that are closest to the Carbs. The larger screw on top is labeled fast idle adjustment.

The next question is this. The idle doesn't seem to want to come down at a stop. It conyinues up there at around 1500-2000 rpms. Is this due to the valve or some vaccum hose near the front carb. Initially I thought it was a sticky throttle arm.

Please help if you can thanks.

Burt cardogman1

[beandip]

Just asking because are you sure that it is because of linkage adjustment ? It is hard to help form the description, but I think that what you are describing is the two screws nearest each dome on the linkage side of the of each carb , those are the ballance screws and the one that in the center closer to valve cover by it's self, is the idle screw. If you cannot get the idle to lower to proper levels you most likely have a vacume leak. If you have the carb off the manifold and you hold it up to a light and look into the throat at the butterfly and it is closed you should not be able to see any light around the edges . If you can then then the butterfly must be adjusted so that it seals all the way arround other wise it is like the throttle is partially open. This may not be your problem , especially if you have not had them apart or off the engine , unless they have come loose. Each butterfly is held in place with two brass screws that are lock-tighted in place so if you do loosen them to adjust , be sure to use lock-tight when you finish. Good luck Gary

[beandip]

There is a vacume line by the front carb that goes to the vacume advance on the dist, and one at the rear of the ballance tube that connects to the vacume booster to the master cylinder , there is another vacume line that connects to the trans , if you have a automatic trans. That's it , unless you still have smog junk running and if thats so I cannot help you sorry. You can check for a vacume leak by spraying carb cleaner around the intake manifold at all it's connections points and you will be able to note the change in idle speed, sorry I dident say this is done with the enging running.

[cardogman1]

thank you gary for the help

Burt