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--- engine:vacuumrouting [2025/03/13 19:05]
94.23.203.202 old revision restored (2022/06/22 20:53)
+++ engine:vacuumrouting [2025/03/13 19:05] (current)
94.23.203.202 old revision restored (2022/06/22 20:54)
@@ Line 1: / Line 1: @@
 ====== Vacuum Routing ======
-Vacuum routing is slightly different between certain model years (and US/UK models). Most of this is US-centric information.
+Vacuum routing is slightly different between certain model years (and US/UK models).
+Most of this is US-centric information. This page attempts to disentangle all the vacuum lines in the engine compartment.
-The US cars had air pumps equipped for emissions compliance. Most owners removed this system due to the fact that it would frequently break. The diverter valve and the associated plumbing is usually removed. Additionally, although the vacuum diagram seems to indicate that there is a line coming off the vacuum pump, this doesn't appear to be the case for many cars.
+The US cars had air pumps equipped for emissions compliance.
+Most owners removed this system due to the fact that it would frequently break.
+The diverter valve and the associated plumbing is usually removed. My car kept the diverter valve to make use of the vacuum connecter on the top.
-{{:engine:screen_shot_2021-12-22_at_6.42.00_pm.png?600|}}
+{{:engine:screen_shot_2021-12-22_at_8.49.00_pm.png?600|}}
 As explained below, the two red boxes are the vacuum solenoids for fuel pressure and ignition.
@@ Line 16: / Line 19: @@
   * Cyan and Green lines are connected (fuel pressure)
+==== Connection Guide ====
+Referring to the colors above:
+Orange (this is a vacuum circuit)\\
+  * Thin nylon line coming from a "T" off the main vacuum line near the vacuum pump
+  * Thin nylon line going to the HVAC flap valves
+  * Connected to airbox
+  * Connected to the the intake flap valve
+  * Connected to the top port of the ignition solenoid
+Green\\
+  * Connected on the front of the intake rail
+  * Connected to the top port of the fuel pressure solenoid
+Magenta\\
+  * Connected to the bottom, center port of the ignition solenoid
+  * Connected to the top port of the distributor (away from the engine)
+Purple\\
+  * Connected to the bottom, side port of the ignition solenoid
+  * Connected to the front edge of the first carb
+Cyan\\
+  * Connected to the bottom port of the distributor (toward the engine)
+  * Connected to the plenum (center top)
+  * Connected to the bottom, side port of the fuel pressure regulator
+  * Clear, hard line to the boost gauge (probably the "whiter" color of the two hard lines).
+Blue\\
+  * Connected to the bottom, side port of the fuel pressure solenoid
+  * Connected to the fuel pressure regulator
+Brown\\
+  * Clear (but probably more yellow), hard line to the oil pressure gauge
+  * Connected to the Oil Gallery Cover which is right under the distributor, attached to the engine block.
@@ Line 45: / Line 84: @@
 {{:engine:solenoid-diagram.jpeg?400|}}
-The least expensive replacement unit is an A/C Solenoid Valve part 1470004 or SW9000. This operates in a similar fashion to the stock unit as long as you set up the vacuum lines properly. These can be purchased for about 1/2 the cost of the Pierburg unit.
+The least expensive replacement unit is an A/C Solenoid Valve part 1470004 or SW9000.
+This operates in a similar fashion to the stock unit as long as you set up the vacuum lines properly.
+These can be purchased for about 1/2 the cost of the Pierburg unit, however, note that the connections are 5mm which are bigger than the stock vacuum lines.
 {{:engine:12-2114cad.jpg?400|}}
 {{:engine:719zinu_ndl._ac_sl1500_.jpg?400|}}

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