Nipple above Cold Start Injector (Page 1/1) Fire hazard SEP 15, 07:03 PM I’m trying to figure out the vacuum line for the brake booster and I’m slightly confused. I’ve looked for the lines on photos but annoy find anything. Literally every line that runs through the firewall is connected to something. So while I was looking through all the lines I noticed that I have one line running to the nipple directly above the cold start injector (see photo). Could this line be the line to the brake booster? The only reason I’m thinking this is because the hose has 3 raised lines, and the hose that runs from the master cylinder into the firewall has these same markings. If my assumption is correct, what connects to the nipple that I had originally connected the hose to? Click here to see photos tshark SEP 15, 07:08 PM No. Idle air intake. The booster is on the upper intake, opposite side. Fire hazard SEP 15, 07:22 PM Yes I know I have hoses and everything on the top of the intake. My problem is I can’t figure out where those hoses connect with the brake booster. I have this much done but I can’t find where this connects to. Fire hazard SEP 15, 07:33 PM Yes I know I have hoses and everything on the top of the intake. My problem is I can’t figure out where those hoses connect with the brake booster. I have this much done but I can’t find where this connects to. fierofool SEP 15, 08:25 PM With the upper intake in place, the hose you have indicated in blue attaches to a nipple in that end of the upper intake. There are two different size nipples. The 88 is the odd one. 85-87 nipples are the same size. Picture #1 of the nipple on the lower intake has a rubber hose that transitions to a metal pipe. That pipe inserts into the lower back of the throttle body. There's an O-ring inside the throttle body that completes the seal. Picture #7, the hose end underneath the upper green arrow indicating the cold start injector attaches to a small nipple on the upper intake, just above the distributor. The two hose ends at the lower right of the picture near the handle for the engine stand attach to small nipples on the bottom and forward side of the throttle body. Beautiful engine you have there. tshark SEP 15, 09:07 PM I believe '87 & '88 are the same. fierofool SEP 15, 09:24 PM I think you're right. My mistake.