Wild idle and noise when A/C on

When I turned on my A/C for the first time this year the engine was making some weird noise and idled wildly from high to low. I bought it over the winter(and didn't test the A/C) so I don't know if it ever worked properly. The gas pedal also depressed on it's own I guess to compensate for the extra load on the engine.
Any ideas what is going on?? I don't know where to start.
Thanks

yep, easy and free fix. On the front(bumper side) of the carb you will see a screw with a rod that goes from a little diapham. turn the 60 on, turn AC on and adjust the screw untill it stoped reving up and down, when it smooths out, set it to 1000ish RPM's. Mine was like this for 3 years before I figured it out one day.

Wow! I hope it's that easy. I know exactly what linkage you are talking about. Is that the idle adjustment??

i had them same problem when I bought mine it was just a vacum hose hooked up wrong. if the last suggestion does not work check your vacum hoses.

With all of those vacuum hoses how do you know which one goes where? I have a Haynes manual but I don't know if it is that detailed

its not the idle speed but the speed the idle bumps up to when the AC in on. the idle screw(for normal idle speed) is on the backside(firewall side) of the carb. should take you all of a few minutes to fix

for the vacuum lines, you really need the FSM for the 81+ 2f motor, but the lines routing is on a sticker under the hood as well

for the AC there is only one vacuume line, it goes from the vacuume switch mounted on the headlight washer bottle(on driver fender) to the diapham mounted on the carb(the one that has the rod to the carb(on front of carb) When you swtich on the AC it turns openes up the vacuume switch(on washer bottle) to pull the diaphram which pulls(or pushes, I forget) the rod.

the vac switch has constate vacuume to the switch.

I use a fj60 carb on my 82 fj40(same carb but the 60 has AC) without AC, I use a vacuume switch with an on/off switch to turn it on.......what does this do if I dont have AC........it makes a way to up the RPM's when winching.........its a vacuume hand throttle I have it set at 1500rpms, flip a switch...........bingo..........RPM's bump up to 1500, then I flip the switch and the rpms drop back to normal.

hope this helps
John

John

[quote author=nymbert link=board=1;threadid=15760;start=msg150037#msg150037 date=1083637917]
Wow! I hope it's that easy. I know exactly what linkage you are talking about. Is that the idle adjustment??
[/quote]

Thanks a bunch for the education! I have a lot of learning yet to do.

I am going to try this today. I just had my AC retrofitted and I recently have rebuilt the carb so I hope it's only the adjustment.