fj60 A/C adjusting rpm problem (1 Viewer)

[hward1]

got the rpm set at idle at roughly 650 rpm - choke finally working now set 1800 rpm when pulled out -- goes back to 650 rpm when pushed back in ------- now the problem is with the A/C idle screw -- turned on the A/C and adjusted the rpm A/C adjusting screw to 1200 rpm - turned the A/C off and the rpm went up too high at idle - like over 1200 rpm --

Whats Wrong now

 

[EWTexas]

can you post a pic?...maybe some linkage is wrong

 

[2mbb]

the screw for setting the AC idle up is on the front of the carb. disconnect the vacuum line from the diaphragm and the diaphragm should release and allow the idle to return to 650. If it does not, then you have something wrong with your linkage or adjustment (it's hard to tell what might be wrong without pictures. With the AC off you should NOT have any vacuum at the free tubing end. If you do, either your VSV is broken, or the vacuum line is not connected properly. When you turn the AC on, there should be vacuum at the tubing end at idle.

 

[hward1]

ok i will get some pics up - i adjusted the front one - had it turned down until 1200 rpm was reached - turned off ac and idle went higher instead of returning down to 650 rpm

 

[hward1]

how does the vacuum suppose to be on the vsv - its hard to tell in emissions pic -

 

[hward1]

 

[hward1]

 

[hward1]

why would the idle go up after ac is turned off instead of going back to 650 after adjusting the ac idle screw - i know when i adjusted it i had to screw it down all of the way to have a change in the ac idle - maybe it still thinks the ac is still on when turned off but really its not and thats why it climbed to over the 1200 rpms with the ac off

 

[hward1]

 

[hward1]

see anything

 

[2mbb]

The first picture in post 6 is of the secondary throttle shaft connected to the secondary diaphragm (I think)--not related to AC idle.

The second picture in post 6 does show the AC idle up. It looks OK, as least compared to the parts schematic.

 

[hward1]

you said ac idle up -- i didnt have the ac on when i took the pic -- if thats what you meant - that could be my problem

 

[2mbb]

you said ac idle up -- i didnt have the ac on when i took the pic -- if thats what you meant - that could be my problem

"AC Idle Up" is the name of that system of components, meaning that it makes the idle go up when the AC is turned on. My previous comment is just that your linkage is connected properly according to the parts schematic. I don't know why the idle would increase when the AC is turned off unless the diaphragm is getting vacuum when it should not be. The diaphragm should get vacuum when the AC compressor kicks on. When the AC is off, the vacuum should vent and the diaphragm should release allowing the linkage arm to extend.

 

[hward1]

ok thanks sat. i am going to go at it again and figure it out i hope

 

[hward1]

ok went through some stuff today and found out i have no vacuum going to this part

the vacuum line on the diaphragm

 

[2mbb]

You should only have vacuum when the AC is turned on. If you don't, try swapping the hoses at the valve. The valve is actually a 3way valve. It either connects the diaphragm to the vacuum source, or it isolates the vacuum source and connects the diaphragm to the atmosphere. If the tubes are switched, then when the AC is turned on, you will connect the vacuum source to the atmosphere, creating a vacuum leak, which could increase RPM.

If that doesn't work you can use the procedure from the FSM to test the valve.

 

[hward1]

ok thanks i will try it tomorrow

 

[jawjatek]

There are so many unresolved, dead-end threads here, it makes searching tough to find what you need to know. Just a reality of forums of all kinds.

 

[Landpimp]

The vsv has failed. You can get one from amother toyota to replace it.

 

[FJ40Jim]

More likely than VSVfailure is that the hoses are backwards at the VSV.
When routed correctly, vacuum is applied to AC pot w/ power, and vac is dumped from AC pot when unpowered.
If hoses are reversed at VSV then vac is applied to AC pot w/ power, and vac is dumped from manifold vac hose when unpowered. Vac will be held in AC pot until it leaks out.