Spark Plugs
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06-25-2007 | 10:53 AM
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Joined: Jul 2005
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RE: Spark Plugs
I believe 2003-2005 are the same. I think but anyway, 2005 says:[align=left]SPARK PLUG[/align][align=left]DESCRIPTION[/align][align=left]Resistor type spark plugs are used on all engines.[/align][align=left]Sixteen spark plugs (2 per cylinder) are used with 5.7L V-8 engines.[/align][align=left]REMOVAL[/align][align=left]3.7L V-6[/align][align=left]Each individual spark plug is located under each ignition coil. Each individual ignition coil must be removed to gain[/align][align=left]access to each spark plug. Refer to Ignition Coil Removal/Installation.[/align][align=left]1. Remove necessary air filter tubing at throttle body.[/align][align=left]2. Prior to removing ignition coil, spray compressed air around coil base at cylinder head.[/align][align=left]3. Prior to removing spark plug, spray compressed air into cylinder head opening. This will help prevent foreign[/align][align=left]material from entering combustion chamber.[/align][align=left]4. Remove spark plug from cylinder head using a quality socket with a rubber or foam insert. Also check condition[/align][align=left]of ignition coil o-ring and replace as necessary.[/align][align=left]5. Inspect spark plug condition. Refer to Diagnostics and Testing - Spark Plug Conditions.[/align][align=left][/align][align=left]CLEANING[/align][align=left]CLEANING AND ADJUSTMENT[/align][align=left]The plugs may be cleaned using commercially available[/align][align=left]spark plug cleaning equipment. After cleaning, file[/align][align=left]center electrode flat with a small point file or jewelers[/align][align=left]file before adjusting gap. (.035)[/align][align=left]CAUTION: Never use a motorized wire wheel[/align][align=left]brush to clean spark plugs. Metallic deposits will[/align][align=left]remain on spark plug insulator and will cause plug[/align][align=left]misfire.[/align][align=left]Adjust spark plug gap with a gap gauging tool.[/align][align=left]INSTALLATION[/align][align=left]3.7L V-6[/align][align=left]Special care should be taken when installing spark plugs into the cylinder head spark plug wells. Be sure the plugs[/align][align=left]do not drop into the plug wells as electrodes can be damaged.[/align][align=left]Always tighten spark plugs to the specified torque. Over tightening can cause distortion resulting in a change in the[/align][align=left]spark plug gap or a cracked porcelain insulator.[/align][align=left]1. Start the spark plug into the cylinder head by hand to avoid cross threading.[/align][align=left]2. Tighten spark plugs. Refer to torque specifications.[/align][align=left]3. Before installing ignition coil(s), check condition of coil o-ring and replace as necessary. To aid in coil installation,[/align][align=left]apply silicone to coil o-ring.[/align][align=left]4. Install ignition coil(s). Refer to Ignition Coil Removal/Installation.[/align][align=left][/align][align=left][align=left]REMOVAL[/align][align=left]3.7L V-6[/align][align=left]An individual ignition coil (2) is used for each spark[/align][align=left]plug. The coil fits into machined holes in the cylinder[/align][align=left]head. A mounting stud/nut secures each coil to the top[/align][align=left]of the intake manifold. The bottom of the coil is[/align][align=left]equipped with a rubber boot to seal the spark plug to[/align][align=left]the coil. Inside each rubber boot is a spring. The[/align][align=left]spring is used for a mechanical contact between the[/align][align=left]coil and the top of the spark plug. These rubber boots[/align][align=left]and springs are a permanent part of the coil and are[/align][align=left]not serviced separately. An o-ring is used to seal the[/align][align=left]coil at the opening into the cylinder head.[/align][align=left]1. Depending on which coil is being removed, the[/align][align=left]throttle body air intake tube or intake box may[/align][align=left]need to be removed to gain access to coil.[/align][align=left]8I - 26 IGNITION CONTROL - SERVICE INFORMATION DR/DH[/align][align=left]2. Disconnect electrical connector from coil by pushing[/align][align=left]downward on release lock on top of connector[/align][align=left]and pull connector from coil.[/align][align=left]3. Clean area at base of coil with compressed air[/align][align=left]before removal.[/align][align=left]4. Remove coil mounting nut (2) from mounting stud.[/align][align=left]5. Carefully pull up coil (1) from cylinder head opening[/align][align=left]with a slight twisting action.[/align][align=left]6. Remove coil from vehicle.[/align][/align]
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