where dose the vacuum under the battery come from
Try a Haines or Chilton manual for your year and make. Your local car parts store or local library should have them
It can be many things. A defective O2 sensor, a vacuum leak, defective catalytic converter just to name a few. Look for a vacuum leak, especially at the PCV hose.
Remove the vacuum hose from the EGR valve. Pull the valve out of the air cleaner housing. Reverse the process to install the new valve.
Mazdatruckin.com has a schematic for the B2600i vacuum lines in their tech section, it includes 4wd and cruise control devices. See the attached links below.
On the firewall above and behind the fuel rail. Two 1/4 inch vacuum hoses come out the bottom and it is held to the firewall by two screws.
You can find a detailed vacuum hose schematic for a 1984 Oldsmobile Cutlass Supreme in the car's owner's manual. You can also check with local auto stores.
Need more information.
Yes as long as its free
It is important to have a diagram when making any changes to a car. For this car a free vacuum diagram can be obtained through asking an auto part store technician for a print out of the schematic.
Autozone has Vacuum diagrams online in their repair manual section http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800618ea
You go to all the trouble of asking a question and then you leave out the information that will allow someone to actually answer your question. Look at what you wrote. You want a vacuum schematic for a 1995, but you do not list any make or model of vehicle. So there is no way I or anyone else can provide an answer. You have posted an unanswerable question.