1990 4runner vacuum issues

Hello,
I recently purchased my first 4runner, I have always wanted one. It had a fuel leak which I thought I was equipped to fix. I found that 2 of the fuel injectors were leaking. Removed the air plenum(I believe this is the proper term for it) and replaced all injectors. In the process I had to remove a large number of hoses and vacuum lines from the passenger side of it. I have looked in multiple spots for hooking this back up, as I was dumb and did not video it before I removed. Now my toyota is starting and there is no longer a fuel leak but, it sounds as though it's missing on a cylinder and the exhaust smells rich. Also If I rev the engine it will die at about 4000 rpm. If anyone has an idea I would really appreciate it. Thank you.

 

Were you ever able to find a diagram for the vacuum hose routing? Sounds like you might have a cracked one somewhere or one connected incorrectly. I'm not much familiar with troubleshooting this sort of thing but I'll see what I can dig up. Sadly not a lot of people on this forum are very helpful or informative.

 

I have found several diagrams and I think I have a handle on that. I went back to oem gaskets rather than liquid that was on it when I got it. I am still chasing down a fuel peak right now. Hopefully can put it back together tomorrow and see. And help with vacuum line and fuel line diagrams is much appreciated, there are so many fuel pathways under there it's driving me crazy.

 

I'll see what I can dig up when I get home. I think I saved the diagram on my other computer it was the front and the hoses on the back. I think for the 3mm I used around 16ft of line purchased from O'reillys. 4ft of 6mm, 2ft of 8mm and 2ft of 10mm. The 3mm isn't that difficult just be careful pulling the lines off of the plastic nipples. I think I cut the old ones off cause they were dry rotted and it was easier to peel them off than risk breaking anything. I gotta find my diagrams the ones on the back are more of a pain to do which is most of your larger diameter lines. Since you mentioned the fuel leak any idea of where abouts its coming from? At least you know the fuel pump is good and the fuel pump relay are working. There is a drain plug on the fuel tank but I highly doubt that. I think this generation also has rubber lines from the tank to the steel fuel lines off of the fuel pump. Don't quote me on that but that would be my first guess.

 

At first it was injectors but I replaced those. Then I though it was the fuel return line as it comes off of the passenger side manifold but that is intact. I retorqued the manifolds and haven't put it back together to test it. Thought about setting the whole thing on fire but that probably wouldn't help and was probably just frustration

 

Know that frustration and feeling very well.

 

Check the underside of the hood and in the engine compartment for a sticker showing how the vacuum lines run. I have one on my car, I think, and will try to take a picture tomorrow.

Otherwise, perhaps these will help. from a 1995 3VZ-E engine: Note: there are two coolant line attachments under the throttle body. There is also a coolant line attachment under the plenum near the rear of the engine on the passenger side. Make sure your plenum gasket is properly installed without rips and with the old gasket fully removed.

 

I had a similar problem on my 1990 4R, 3VZE. It would stumble and miss at about 3000 rpm. Below that, it ran OK. Took a long time, but I determined it was the coil. I replaced the coil and the problem went away. Mine is also running rich, but I don't have a solution, yet. Check your spark plugs and wires. Ensure that the plug wire is properly connected to the end of the plug. Might also remove the dist cap and clean the contacts. Examine it for damage/cracks.