AutoZone 1959 Chevrolet Truck 3500 3/4 ton P/U 2WD Dbl Duty 3.8L 1BL OHV 6cyl | Repair Guides | Engine Electrical | Spark Plugs & Wires | Spark Plugs | AutoZone.com

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    1959 Chevrolet Truck 3500 3/4 ton P/U 2WD Dbl Duty 3.8L 1BL OHV 6cyl

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    Toyota Sienna 2000-06

    Spark Plugs

    Print

    Inspection



    Inspect the electrodes and ceramic insulator.

    Burned or worn electrodes may be caused by:



    Advanced ignition timing
     
    Loose spark plug
     
    Plug heat range too hot
     
    Insufficient cooling
     

    Fouled plug may be caused by:



    Retarded ignition timing
     
    Oil in combustion chamber
     
    Incorrect spark plug gap
     
    Plug heat range too cold
     
    Excessive idling/low speed running
     
    Clogged air cleaner element
     
    Deteriorated ignition coils
     

    Do not adjust the gap of platinum tip plugs; replace the spark plug if the gap is out of specification. The gap should be 0.039-0.043 in. (1.0-1.1mm).

    1. Replace the plug at the specified interval or if the center electrode is rounded.
    2.  
    3. Apply a small quantity of anti-seize compound to the plug threads, and screw the plugs into the cylinder head finger-tight.
    4.  

    Removal & Installation



    When removing spark plugs, work on them one at a time to avoid confusion. Do not remove the plug wires at the same time, unless you number them, they may become mixed up. Take a minute before you begin and number the wires with tape.

    1. Disconnect the negative battery cable, and if the vehicle has been run recently, allow the engine to thoroughly cool.
    2.  
    3. Carefully twist the spark plug wire boot to loosen it, then pull upward and remove the boot from the plug. Be sure to pull on the boot and not on the wire, otherwise the connector located inside the boot may become separated.
    4.  
    5. Using compressed air, blow any water or debris from the spark plug well to assure that no harmful contaminants are allowed to enter the combustion chamber when the spark plug is removed. If compressed air is not available, use a rag or a brush to clean the area.
      NOTE
      Remove the spark plugs when the engine is cold to prevent damage to the threads. If the plugs is hard to remove, apply a few drops of a penetrating lubricant to the area around the base of the plug, and allow it sit for a few minutes to work.

    6.  
    7. Using a spark plug socket that is equipped with a rubber insert to hold the plug, turn the spark plug counterclockwise to loosen and remove the spark plug from the bore.
      WARNING
      It is advisable not to use a flexible extension on the socket when removing or installing spark plugs. This may allow a shear force to be applied to the plug. A shear force could break the plug off in the cylinder head, leading to costly and frustrating repairs.

    8.  

    To install:

    1. Inspect the spark plug boot for damage and replace if necessary
    2.  
    3. Check and adjust the spark plug gap
    4.  
    5. Carefully thread the plug into the bore by hand. If resistance is felt before the plug is almost completely threaded, back the plug out and begin threading again.
    6.  
    7. Carefully tighten the spark plug to 13 ft. lbs. on 3.0L engines or 18 ft. lbs. on 3.3L engines.
    8.  
    9. Apply a small amount of silicone dielectric compound to the end of the spark plug lead or inside the spark plug boot to prevent sticking, then install the boot to the spark plug and push until it clicks into place.
    10.  

     
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