Rpm too high!!

[fabioblazer]

Hey guys! a question please

thanks!

i rebuilt my engine, all is ok, just a thing is weird.

i started engine for a first test, i removed valve cover, i adjusted valves and it ran good.

but when i reassembled valve covers, i started the engine again but, without touching accelerator pedal, engine speed (RPM) were so high that i had to shut it down!!

i saw that carb throttle linkage stop, doesn't touch fast idle screw as before!

someone has some good idea!?

Thanks for attention guys!

Fabio

[Grim 82]

Is the throttle return spring hooked up?

[jaredts]

Is this a factory quadrajet (what carburetor)?  When it revved high did you try to tap the throttle to get it to idle down?

[fabioblazer]

thanks for answer!
yes rochester quadra-jet. it has just 2 years.

i tried to close linkage manually but it's too hard, just if i turn manually the choke, throttle linkage touches the idle screw on the driver side, but as soon as i push down accelerator pedal, throttle linkage turns back but it is too distant from idle screw, as if i push down accelerator to the floor!

i tried to remove spring and accelerator cable, without nothing, but the problem remains

[VileZambonie]

So you are on the fast idle cam then. Is the choke rod hooked up and moving freely? If so check the vacuum choke break.

[fabioblazer]

all moves freely but throttle linkage doesn't come back completly.
maybe i must turn back choke linkage or precisly fast idle cam, but i didn't touch anything!
just after removing and reassembling valve covers
maybe i touched something but it would be extremly strange

[VileZambonie]

Did you knock the vacuum hose off of the choke break?