I think your truck is almost exactly like mine. I got my truck from the Nissan dealership in Sept 1985. The window sticker calls my truck a 1986 Long bed 720 Pickup truck. Mine is the ST model which has some extra stuff like nice wheels and a pop top and sliding rear glass window. But it's the same engine and vacuum lines as yours. So your pictures on the vacuum lines really is a big help to me. Thank you for taking the time to do an excellent job of showing where all the vacuum lines go and come from. I love the way you show which way the picture is orientated by showing which is the driver side of the picture and which is the passenger side as well as the front, back and top and bottom in the picture as well as showing the vacuum lines with dotted ink marks or arrows. That's a great way to show how to work on these trucks and where the vacuue lines go.
I never did know where those hard lines went to unit I read you thread today. Now I know where the vacuum advance hose comes form and where it goes.
Great Job fastboatman.
fastboatman29212 wrote:Stay tuned. There are a few more vac lines (believe it or not) that I have not shown yet. Photos coming soon! Anyway, I recently found some vac lines that I didn't know were there. All of this stuff was designed for a reason and by people who are way smarter than me.
I decided to make this post because Aven was asking for help AND we frequently get questions about vac lines and rough running engines. Usually people will just delete the vac lines and cap off the ports. That's fine if you do it properly AND CAP THEM ALL OFF, (except the one to the vacuum advance of course)!
So far, I have found at least 6 ports on the intake manifold. Interestingly, there are 3 lines that connect to vacuum switches which then have electrical connections to the computer in my '86 (an '86 has a electronically controlled carb). I've been wondering how performance would be affected with those vac lines deleted. Hmmmmm! More reading to do I guess. LOL!