In an attempt to simplify the vacuum system under the hood, is there a how to?

1986 Canadian V12

carbon canister already deleted.

Cruise control will be deleted as well.

I would like to get rid of the 45 sec timer for vac advance.

I believe i need to retain one valve for AC but hoping the rest can go.

i have searched this forum and cant really find details of what can be removed without issues.

even a definition of the parts and what they do would help,

all i really need is one vac line to the distributor right?

what does the blue item do?

 

The "blue thing" is NOT to be removed. It provides full fuelling at WOT to prevent detination. It should be electrically connected (two wires) and a vac line to the manifold. The item with 12v sticker on it is to increase the tickover when the A/C kicks in.

The easiest and best thing to do with the huge cat's cradle of advance/retard vac lines is to run a single line from the spigot under the A bank manifold just inside the butterfly to the vac capsule on the distributor, and can/block off the rest. Check the vac capsule still holds vac by sucking on the tube to it, if you can suck air, the casule is toast and should be changed.

Removing the cruise allows everything vac related connected to it to be removed and the unused manifold spigots capped. I advise changing out any OEM vac lines with silicone ones, most particularly the one from the gearbox modulator to the A bank spigot. Any questions, just ask. I have done all these things.

 

Thanks Greg.

capped 3 vacuum nipples. Removed everything(not the blue fuel enrichment device)

ran a single vacuum line from timing advance capsule to lower nipple on throttle body.

runs fine, seems like slightly better throttle response.

advanxe capsule works, I am running a manual transmission so that vac line is long gone.

i still have a slight change in rpms at around 45 secs however. Even once car is at operating temp, when started, it will hold 1000 rpm and then drop to set idle speed after ~45 sec

what could be controlling rpms?

 

Less clutter

 

Much better!
I do not know on USA spec cars wheren the 45 sec timer is; but I suspect under the knee dash trim on the US passenger side. It can be disconnected, but you must be sure when disconnected that it is disabled rather than made permanent!

The Great Palm's book will probably explain it, or someone on here will know.

 

I think i will just leave the 45 sec timer as is, I believe the SAV(cylindrical solenoid on air box) is held open for 45 sec.

I am not sure how removal of timer would impact functioning of the SAV, i assume I still need it to compensate when A/C is in use.