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Removing anti-run-on valve and check valve

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NOTE: The removal of a seat is recommended in order to access the engine more easily in the passenger compartment and to avoid damaging the seats. Refer to REMOVING AND INSTALLING FRONT SEAT - AS OF MY 1996 .
NOTE: A second person is required for removing/fitting the convertible-top compartment lid to avoid damage.
  1. Move convertible top to service position, remove convertible-top compartment lid. To do this, unclip the plastic covers (Item 40) on the cover, remove 1 collar screw (Item 14) and one bolt (Item 13) using a retaining clip (Item 8) to the left and right on the fixing lever. See overview in REMOVING AND INSTALLING CONVERTIBLE TOP COMPARTMENT LID . Use the Spring fix system assembly tool for pin circlips 131 to remove the retaining clips.
  2. Remove the engine compartment lid and the maintenance cover. Refer to ENGINE MAINTENANCE: OPENING AND CLOSING ENGINE COMPARTMENT .
  3. Attach protective covers to the rear of the vehicle to avoid damaging the paint, etc.
    NOTE: Note the work instructions for disconnecting and reconnecting the battery.
  4. Disconnect battery. See WORK INSTRUCTIONS AFTER DISCONNECTING THE BATTERY .
  5. Unscrew drive belt. Refer to ENGINE MAINTENANCE: CHECKING POLYRIB BELT STATE .
  6. Release box for B + connector. To do this, unscrew the two hexagon-head bolt screws on the crankcase and set the box to one side.
    CAUTION:
    • Pentosin is hazardous to the health!
    • Wear protective gloves and goggles, if the eyes or skin come into contact with the fluid, wash immediately with water!
    • Collect emerging Pentosin!
    • Protect the leads against soiling and damage with caps!
    • Clean hoses which come into contact with Pentosin thoroughly!
  7. Remove supply tank of the power steering system. To do so, suck fluid (Pentosin) out as much as possible. Then open the bayonet lock (-arrow-  in Fig 1 ) on the expansion tank and remove the tank. If necessary, clean up any Pentosin that has spilled using a cloth. Close the opening in the servo pump with a clean plug.
    Fig 1: Opening Bayonet Lock On The Expansion Tank
    G03139091Courtesy of PORSCHE OF NORTH AMERICA, INC.
    NOTE: The air conditioning circuit must not be opened to loosen the air conditioning compressor.
  8. Loosen air-conditioning compressor. To do this, unscrew the two hexagon-head bolts at the front -arrows-  on the side of the maintenance opening (in the passenger compartment).
    Fig 2: Loosening Air-Conditioning Compressor Bolts
    G03139092Courtesy of PORSCHE OF NORTH AMERICA, INC.
  9. Unscrew the fastening screw at the back -arrow-  from the engine compartment side. See Fig 3 . This is positioned between the intake manifolds of the fourth and fifth cylinders.
    Fig 3: Removing Fastening Screw On Intake Manifold
    G03139093Courtesy of PORSCHE OF NORTH AMERICA, INC.
  10. Disconnect the ground connection cable plug. Lift the air conditioning compressor with the connected leads out of the engine compartment and set them on a support.
  11. Loosen the generator and lay it to one side. See REMOVING AND INSTALLING GENERATOR .
  12. Loosen the ground cable on the bracket that is attached to the body for the secondary air pump. To do this, unscrew the M8 hexagon nut on the bracket and lay the ground cable to one side.
  13. Remove the secondary air pump. To do this, pull off the hose to the anti-run-on valve, unscrew 3 M6 collar nuts on the bracket and pull off the cable plug. Lever the pump out of the bracket.
  14. Unscrew the fuel connection pipe of cylinder bank 1-3 on the intake distributor. To do this, unclip the wiring harness from the wire retainers and remove the 2 M6 x 12 hexagon-head bolts. Carefully take out the fuel collection pipe, including the injection valves, from the intake distributor and lay it to one side. Replace the O-rings on the injection valves before installation.
  15. Remove the air guide cowl between the air filter housing and throttle body. Do this by unscrewing the screw-type hose clamps on the air filter housing and throttle body and lift the cowl out of the engine compartment.
  16. Remove intake distributor, cylinder bank 1-3. Do this by unscrewing the 2 screw-type hose clamps on the rubber sleeves to the right on the intake distributor centre and on the tuning pipe. Then unscrew the 6 M6 x 35 micro-encapsulated hexagon-head bolts on intake distributor 1-3. Pull off the engine compartment temperature sensor; pull off the positive crankcase ventilation line on the oil mist separator. Release the intake distributor from the rubber sleeves and lift it up out of the engine compartment.
  17. Seal intake openings in the cylinder header with plugs.
  18. Remove intake distributor centre and tuning pipe. Unscrew the 2 screw-type hose clamps on the rubber sleeves on the left. Unscrew the M6 fastening nut on the throttle body, pull off the positive crankcase ventilation line and remove the intake distributor centre. Pull off the existing vacuum lines on the rubber sleeves of the tuning pipe and remove the tuning pipe.
  19. Remove oil filler neck. Remove 1 M6 hexagon-head bolt and pull the oil filler neck out of the crankcase. Replace O-ring.
  20. Open the spring band clamp on the connecting hose to the secondary air pump -arrow A-  on the anti-run-on valve -arrow-  and pull off the hose. See Fig 4 .
    Fig 4: Opening Spring Band Clamp
    G03139094Courtesy of PORSCHE OF NORTH AMERICA, INC.
  21. Unscrew the air line union nut (hexagon a/f 22) on the distributor housing.
  22. Pull off the vacuum lines on the vacuum reservoir and anti-run-on valve, unscrew 2 M6 x 20 -1-  hexagon-head bolts for the distributor housing on cylinder head 1-3. See Fig 5 . Unclip switch-over valve on distributor housing. Remove distributor housing including vacuum reservoir, check valve and anti-run-on valve from the engine. Unscrew fastening screw from vacuum reservoir, remove reservoir.
    Fig 5: Removing Vacuum Lines On Vacuum Reservoir And Anti-Run-On Valve
    G03139095Courtesy of PORSCHE OF NORTH AMERICA, INC.
  23. Unscrew 2 M6 x 16 hexagon-head bolts -1-  for the air line on cylinder head 4-6, remove air line. See Fig 6 .
    Fig 6: Loosening Hexagon-Head Bolts For The Air Line On Cylinder Head
    G03139096Courtesy of PORSCHE OF NORTH AMERICA, INC.
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