I have a 1990 4runner v6. The 4wd was working when i bought the truck. Me and a friend did the head gasket replacement and put it all back together. Now I dont have a 4wd light and front tires dont spin. I can hear a click from what i am assuming the relay in the dash when i shift into 4. I can also get low. I lock the hubs but i still dont have 4wd. The light does not come on. I had a vacuum issue where i had a rough idle but i believe i have fixed that by reconnecting the power steering vacuum lines last night. They were damaged. It idles better it seems, but still no 4wd. What lines should I follow? Can somebody please be kind enough to post a pic of where the lines come out and where they connect to the ADD?

Thanks for all of your help!!

 

auto hubs?

 

There are 2 vacuum lines that run to the front diff, at the ADD vacuum actuator. I'll bet you've pulled 1 or both of them loose. They should run down the passenger side in the engine bay and wrapped in some kind of braided black plastic.

 

See if this thread helps https://www.yotatech.com/forums/f116...estion-113564/

 

manual hubs.

And thanks for the info.. I will take a look at them.

 

anybody have pictures of the actuator?

 

At the end of the thread cited by vasinvictor. Not the best, but they'll tell you everything you need to know.

 

Thanks for your help! Will look into this weekend and let you all know what I find out..

 

Fixed it thanks guys. The VCV that was plugged into a non vacuum line... swapped it and its good to go. THX!!