Inspection & Gapping
Check the plugs for deposits and wear. If they are not going to be replaced, clean the plugs thoroughly. Remember that any kind of deposit will decrease the efficiency of the plug. Plugs can be cleaned on a spark plug cleaning machine, which can sometimes be found in service stations, or you can do an acceptable job of cleaning with a stiff brush. If the plugs are cleaned, the electrodes must be filed flat. Use an ignition points file, not an emery board or the like, which will leave deposits. The electrodes must be filed perfectly flat with sharp edges; rounded edges reduce the spark plug voltage by as much as 50 percent.
Check the spark plug gap before installation. The ground electrode (the L-shaped one connected to the body of the plug) must be parallel to the center electrode and the specified size wire gauge (please refer to the Tune-Up Specifications chart for details) must pass between the electrodes with a slight drag.
Always check the gap on new plugs as they are not always set correctly at the factory. Do not use a flat feeler gauge when measuring the gap on a used plug, because the reading may be inaccurate. A round-wire type gapping tool is the best way to check the gap. The correct gauge should pass through the electrode gap with a slight drag. If you're in doubt, try one size smaller and one larger. The smaller gauge should go through easily, while the larger one shouldn't go through at all. Wire gapping tools usually have a bending tool attached. Use that to adjust the side electrode until the proper distance is obtained. Absolutely never attempt to bend the center electrode. Also, be careful not to bend the side electrode too far or too often as it may weaken and break off within the engine, requiring removal of the cylinder head to retrieve it.
Removal & Installation
- Disconnect the Intake Air Temperature (IAT) sensor connector.
- Loosen the clamp at the air cleaner assembly.
- Remove the push-pin attachment from the outlet resonator/duct assembly to support bracket.
- Loosen the clamp at the throttle body assembly.
- Remove the outlet resonator/duct assembly.
Disconnect the EI module electrical connector.
- Remove the ignition module attachment bolts.
Remove the ignition module housing assembly with the spark plug boots from the spark plugs.
WARNINGTo avoid getting water and debris into the spark plug holes, used compressed air and a shop rag to blow out each spark plug hole before plugs are removed.
- Remove the spark plugs using a spark plug socket.
- Gap the spark plugs to 0.045 inch (1.1mm).
Install spark plugs and tighten to 15 ft. lbs. (20 Nm).
- Apply dielectric compound to the spark plug boots and ensure no corrosion is present.
- Install the ignition module housing assembly with spark plug boots into position and tighten the ignition module-to-camshaft cover bolts to 89 inch lbs. (10 Nm).
- Connect the EI module harness connector. Push in until a click is heard and pull back to confirm a positive engagement.
- Position the outlet resonator/duct assembly into position.
- Connect the PCV fresh air vent hose assembly.
- Tighten the clamp at the throttle body assembly.
- Position the outlet resonator/duct assembly up with support bracket and install the push-pin.
- Tighten the clamp at the air cleaner assembly.
- Connect the IAT sensor connector.
- Before servicing the vehicle, refer to the Precautions Section.
Remove ignition coils. Refer to Ignition Coil Pack removal and installation.
NOTEMake sure that any water and/or debris is blown out of the spark plug holes prior to removing the spark plugs.
Remove the spark plugs using a
inch spark plug socket.
- Ensure the spark plugs are gapped to specification: 0.042 in. (1.06mm).
- Install the spark plugs. Tighten the plugs to 15 ft. lbs. (20 Nm).
- Install the ignition coils. Refer to Ignition Coil Pack removal and installation.
Remove the ignition coils on Bank 1 as follows:
- Remove the air cleaner outlet duct assembly.
- Disconnect the electrical connectors.
- Remove the engine coil bolts.
- Remove the engine coils.
Remove the ignition coils on Bank 2 as follows:
- Disconnect the electrical connectors.
- Remove the engine coil bolt.
Remove the engine coils.
WARNINGRemove any water and debris from the spark plug holes before spark plug removal with compressed air.
- Remove the spark plugs with a spark plug socket.
- Inspect the spark plugs.
Gap the spark plug, using a round wire type spark plug gap gauge. Adjust spark plug gap to 0.043 inch (1.1mm).
WARNINGDO NOT coat the spark plugs with anti-seize compound. Over-tightening could occur and damage to the cylinder head threads may result.
- Install the spark plugs with a spark plug socket. Tighten the spark plugs to 13 ft. lbs. (18 Nm).
- Install the ignition coils.