1985 GMC engine vacuum hoses

[68c10owner]

Does anyone have a diagram of the underhood vacuum lines on a 1985 GMC or chevy with a carbed 305? I did a tune up on my truck so I can go get it smogged and now I`ve got trouble codes and its got a miss under acceleration. I`m pretty sure the firing order was done right but I`ll double check after I calm down. I just dont have a manual and when I google it I get all kinds of stuff and I`m not sure whats correct.

[324matt]

All of the emissions vacuum hose routing is on a sticker on the air fter housing. Very easy to read and figure it out

[85/Silverado]

There are A LOT of Vacuum lines. Is this what you need? If you need a larger version PM me and I'll send it. I'm off to the Dr. at this time but I'll be home this afternoon.

[68c10owner]

Originally Posted by 324matt

All of the emissions vacuum hose routing is on a sticker on the air fter housing. Very easy to read and figure it out

My truck doesn't have one.

Originally Posted by 85/Silverado

There are A LOT of Vacuum lines. Is this what you need? If you need a larger version PM me and I'll send it. I'm off to the Dr. at this time but I'll be home this afternoon.

Thanks. I'll let you know if I need a big one. I'll check it on the computer later.

[Bigstevex4]

The worse year Good luck that sticker is a huge help if its on.

[85/Silverado]

Here is a bigger shot.

[chengny]

Here are the 4 possible diagrams that apply to a 1985, 305 engine, A/T, low altitude with California emissions:




I didn't look to hard but it appears that the top two (UJH/UJD) are identical as are the bottom two (UJJ/UJF).

[68c10owner]

Originally Posted by chengny

Here are the 4 possible diagrams that apply to a 1985, 305 engine, A/T, low altitude with California emissions:




I didn't look to hard but it appears that the top two (UJH/UJD) are identical as are the bottom two (UJJ/UJF).

Thanks. These will help along with the obd1 code stuff you broke down for me on the other squarebody forum.