On mine, the top portion of the vacuum canister has the WHITE hose on the right nipple, and the BLACK hose on the right nipple on the lower portion.

Like I said, the RED is vacuum straight from the engine, and it gets split right before the vacuum canister and goes to BOTH left nipples (they're marked "VAC" right behind the nipples on the canister itself)

Also, I had a persistent 628 TCC slip, which I believe turned out to be the main harness plug into the transmission. I hadn't heard of this one before, so I pulled the transmission and replaced the torque converter, but then someone on here mentioned the plug being the usual cause.

I checked it out and lo and behold, almost all of the wires were frayed. So, I put the converter in since I had the trans out, but I'm pretty sure the wires falling apart at the plug was the real reason. Probably yours too. I got my repair harness from NAPA for like $70ish.. You can get it a lot cheaper on the internet if you're not in a hurry for it.



^ Can only see the one wire here, but from the other side once I wiped away the crap, most of them were bare.

 

Thanks subford. I am I attaching a picture of the vacuum diagram. I spend time going over it yesterday and could not really make much sense of it. Part of the problem is that the location of the components don't match the diagram, from what I can tell. I am still trying to figure out where the hose coming from the throttle goes to, the one with blue head bolt (used to cap it) in the pictures I posted. I found another line that was disconnected. It had a piece of black hard plastic line on it. I went ahead and connected it next to the upper outlet to the right of the red (vac) one on the canister, like the one in your picture. I will post pictures of all these lines to give you guys a better idea.

Also, thanks for the information on the 628 code. I had not noticed any slippage but I went ahead and added a bottle of the Lucas additive anyway. I will check the harness when I get a chance.

Thanks again. MMA

 

FPRC = Fuel Pressure Regulator Control, The fuel pressure regulator located on fuel rail near back of engine drivers side.

AIR D = Secondary Air Injection Diverter valve for sending air from air pump to the exhaust system. system.

AIR B = Secondary Air Injection Bypass valve for sending air from air pump bypass valve for sending unwanted air to atmosphere.

CARBON CAN =The carbon canister below the passenger headlight canister is a device designed to hold dry material. The evaporative emission canister contains activated charcoal which absorbs fuel vapors and holds them until the vapors can be purged at an appropriate time.

CANP = Canister Purge Valve for the fuel vapors to the throttle body. Located on the hose between the throttle body and the carbon canister.

MAN VAC = Engine main vacuum source. Located on the intake manifold.

EGR = The Exhaust Gas Recirculation valve. Located near throttle body.

MAP = Manifold Absolute Pressure sensor located above heater box on the safety wall.

VRESER = Vacuum RESERvoir, The big black container in question. You should have had two of them but someone has replaced them after the truck was built.

EVR/EGR = EGR Vacuum Regulator valve located near the Ignition coil.

SOL V/AIR D = Secondary Air Injection Diverter solenoid valve located near the Ignition coil.

SOL V/AIRB = Secondary Air Injection Bypass solenoid valve located near the Ignition coil.

 

Thanks subford, this will help me quite a bit in finding where the hoses go. I won't get a chance to look into it until the weekend but I am looking forward to nail this one. Will report back and thanks again. MMA