What are these?

[RandyS]

Right next to my main fuse box under the hood on my 92 FJ80, there is a row of 3 small blocks with a electrical plug & vacuum hose for each one.
I am just wondering what they do and can i get the part numbers for them in case they ever need replacing.
Thanks

 

[erics_bruisers]

sounds like a heat exchanger for the EFI's super-computer --

-- you want the P/Ns in case they ever blow?

C-Dan can hlp you that day in the future, if it ever comes --

eric

 

[RandyS]

How would i know if one of the 3 stoped working, and do they play a part in how well the motor idles?

 

[Safado]

Pics would be nice, and an Factory Service Manual is the best investment you'll ever make. It will explain how to test them if possible and also let you know what part they play in the big picture.