Hey while trying to dignose my rough runing idles some of the time 84 fj60 i took out the VCV and blew a little compresed air through it and now the 60 will not idle
and now it runs worse
What is the VCV valve 4
- Thread starter scott84
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
Hey while trying to dignose my rough runing idles some of the time 84 fj60 i took out the VCV and blew a little compresed air through it and now the 60 will not idle and now it runs worse
- Joined
- Nov 28, 2008
- Threads
- 32
- Messages
- 583
- Location
- Townsend/Big Sky, Montana
- Website
- www.myspace.com
use the search function on this forum. top right corner on the beige header.
they are vaccum control valves. some others are: others are VTV, PCV, etc
they only allow a certain ammount of vacum through each (there are different ones that let more or less through).
i am assuming you blew it with too much pressure, and now it is not ever going to work right again. because it is not controlling the right ammount of vaccum in that spot, or allowing for backdraft.
someone posted up recently all of the different values for each VCV by color...
they are vaccum control valves. some others are: others are VTV, PCV, etc
they only allow a certain ammount of vacum through each (there are different ones that let more or less through).
i am assuming you blew it with too much pressure, and now it is not ever going to work right again. because it is not controlling the right ammount of vaccum in that spot, or allowing for backdraft.
someone posted up recently all of the different values for each VCV by color...
If you are talking about the green one on the carb, it's for the choke breaker. You may broke it's guts by blowing air through it with a compressor. That one has an extremely slow vacuum bleed off.
There is a testing procedure for the VTV's in the FSM .
There is a testing procedure for the VTV's in the FSM .
We have to be careful about nomenclature. There is one VCV, several VTV and VSV's.
The VTV's are vacuum transmission valves. These have the colored bands and control vacuum (air) flow in one direction.
The VSV's are vacuum switching valves and usually an electric valve that turns vacuum on/off. BVSV's are bimetal VSV's and these switch on temperaure.
There is one identified VCV and this is a valve that is used to control the purge of the charcoal cannister. When the truck is hot (controlled by BVSV) and when a ported vacuum is high enough the VCV opens to pull air through the canister into the carburetor.
Check the VCV. put a vacuum pump with gauge on port S to make sure the diaphragm still holds vaduum. Then test ports Y and Z. with no vacuum applied, you should not be able to blow air (with your mouth) into Z and out Y. With vacuum applied, air should flow from Z to Y.
The VTV's are vacuum transmission valves. These have the colored bands and control vacuum (air) flow in one direction.
The VSV's are vacuum switching valves and usually an electric valve that turns vacuum on/off. BVSV's are bimetal VSV's and these switch on temperaure.
There is one identified VCV and this is a valve that is used to control the purge of the charcoal cannister. When the truck is hot (controlled by BVSV) and when a ported vacuum is high enough the VCV opens to pull air through the canister into the carburetor.
Check the VCV. put a vacuum pump with gauge on port S to make sure the diaphragm still holds vaduum. Then test ports Y and Z. with no vacuum applied, you should not be able to blow air (with your mouth) into Z and out Y. With vacuum applied, air should flow from Z to Y.
location
i need to check mine just in case it needs to be replaced,where can i find this under the hood?
John
i need to check mine just in case it needs to be replaced,where can i find this under the hood?
John
i need to check mine just in case it needs to be replaced,where can i find this under the hood?
John
It's mounted on the left side fender well. Port Y out the bottom is connected to the port on the carburetor spacer.
I forgot there is a second VCV that is used to control the purge of the distributor cap. The VCV clips underneath the air cleaner. Since it has the same part number as the one used to purge the charcoal canister, the test procedure should be the same. It's the VCV at the top of the page on this drawing:
http://www.sweetillusions.org/toyota/6.pdf
http://www.sweetillusions.org/toyota/6.pdf
years after the original post 2mbb's drawing bailed me out!