Saab 2000-06

Spark Plugs

Print

Inspection



  1. Inspect the spark plug for the following:

    Deposit build-up that is closing the gap between the electrodes. Deposits are caused by oil or carbon fouling. Clean the spark plug..
     
    Check for wet, black deposits on the insulator shell bore electrodes, caused by excessive oil entering the combustion chamber through worn rings and pistons, excessive valve-to-guide clearance or worn or loose bearings. Correct the oil leak concern. Install a new spark plug.
     
    Look for black, dry, fluffy carbon deposits on the insulator tips, exposed shell surfaces and electrodes, caused by a spark plug with an incorrect heat range, dirty air cleaner, too rich a fuel mixture or excessive idling. Install new spark plugs.
     
    Normal burning.
     
    Light tan or gray deposits on the firing tip.
     
    Pre-ignition. This identified by melted electrodes and a possibly damaged insulator. Metallic deposits on the insulator indicate engine damage. This may be caused by incorrect ignition timing, wrong type of fuel or the unauthorized installation of a heli-coil insert in place of the spark plug threads. Install a new spark plug.
     
    Overheating. This is identified by a white or light gray spots and with bluish-burnt appearance of electrodes. This is caused by engine overheating, wrong type of fuel, loose spark plugs, spark plugs with an incorrect heat range, low fuel pump pressure or incorrect ignition timing. Install a new spark plug.
     
    Fused deposits. These are identified by melted or spotty deposits resembling bubbles or blisters. These are caused by sudden acceleration. Install a new spark plug.
     

  2.  

Removal & Installation



2000-2002


Click image to see an enlarged view

Fig. Disconnecting ignition module and removing screws

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove or disconnect the following:

    Engine cover, if equipped
     
    Negative battery cable
     
    For 3.0L engines, connector to the pressure sensor on the intake manifold.
     
    10-pin ignition module connector (1)
     
    4 ignition module screws (2)
     
    Spark plugs
     

  4.  

To install:

  1. To install, reverse removal procedure.
  2.  
  3. Apply Molykote 1000 (30 20 971) or equivalent to the spark plug threads. Apply Krytox (30 19 312) to the rubber seals.
  4.  
  5. Tighten spark plugs to: 21 ft. lbs. (28 Nm). Tighten ignition module screws to: 8 ft. lbs. (11 Nm).
  6.  

2003-2006
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove or disconnect the following:
    NOTE
    Take care when releasing the locking mechanism on the connector so as not to damage the connector. Pull the halves straight apart to avoid bending the pins.



    Upper engine cover
     
    Negative battery cable
     



    Ground cables and connectors of the engine control module

    Click image to see an enlarged view

    Fig. Removing engine control module with mounting (3)

     
    Engine control module with mounting and move it aside. The lower hole of the mounting is slotted
     
    Atmospheric pressure sensor connector
     
    Cable duct from the plate bracket
     
    Plate bracket from the intake manifold
     
    Brake vacuum hose from the intake manifold
     
    Holder and check valves for crankcase ventilation and tank bleeding
     
    Ignition coil connectors. At cylinder 4, the ignition coil must be loosened and lifted slightly in order to unplug the connector

    Click image to see an enlarged view

    Fig. Removing ignition coil (9)

     
    Ignition coil
     
    Spark plugs using spark plug socket tool (83 95 485) or equivalent, with guide sleeves
     

  4.  
  5. To install, reverse removal procedure. Tighten plugs to: 21 ft. lbs. (28 Nm).
  6.  

 
label.common.footer.alt.autozoneLogo