Spark Plug: Service and Repair
Spark Plugs, Replacing
• Spark Plug Wrench (3122 B)
• Ignition Coil Puller (T40039)
• Ignition Coil Puller (T10166)
CAUTION!
Place (T40039) on top rib - arrow - of ignition coil and pull this from spark plug. Placing on bottom rib can cause damage.
• Plug designation, refer to => Fuel Injection and Ignition 28 Removal and Installation
• Observe waste disposal regulations!
V8
- Switch ignition off.
Right cylinder bank
- Remove air filter. Refer to => [ Air Filter, Cleaning Housing and Replacing Filter ] Air Filter, Cleaning Housing and Replacing Filter.
- Remove both bolts - 1 -.
- Push connector - 2 - toward ignition coil, press on catch with hand and remove connector.
- Remove ignition coils - 3 - from spark plugs with (T40039).
- Remove spark plugs using (3122B).
- Install new spark plugs.
• Push ignition coils by hand into intended resources in cylinder head cover.
Left cylinder bank
- Remove both bolts - 1 -.
- Push connector - 2 - toward ignition coil, press on catch with hand and remove connector.
- Remove ignition coils - 3 - from spark plugs with (T40039).
- Remove spark plugs using (3122B).
- Install new spark plugs.
• Push ignition coils by hand into intended resources in cylinder head cover.
V10
- Remove rear engine cover - 2 -.
Removing right cylinder bank 1:
- Remove air guide hose between Mass Air Flow (MAF) Sensor (G70) and Throttle Valve Control Module (J338) by loosening hose clamps - arrows -.
- Lay aside air guide hose with connected vacuum lines - 1 and 2 -.
- Remove electrical connector from Mass Air Flow (MAF) Sensor (G70).
- Remove bolts - arrows -.
- Remove upper part of air filter housing.
- Remove the screws - 1 - and - 2 -.
- Pull ignition coils about 30 mm out of spark plug shaft with (T40039).
- Release electrical connectors and remove them evenly from ignition coils.
- Remove spark plugs using (3122B).
- Install new spark plugs.
Removing left cylinder bank 2:
- Remove air guide hose between Mass Air Flow (MAF) Sensor (G246) and Throttle Valve Control Module (J544) by loosening hose clamps - arrows -.
- Remove electrical connector from Mass Air Flow (MAF) Sensor 2 (G246).
- Remove bolts - arrows -.
- Remove upper part of air filter housing.
- Remove the screws - 1 - and - 3 -.
- Pull ignition coils about 30 mm out of spark plug shaft with Puller (T40039).
- Release electrical connectors and remove them evenly from ignition coils.
- Remove spark plugs using spark plug wrench (3122B).
- Install new spark plugs.
Installing ignition coils
- Loosely place all ignition coils in spark plug shaft.
- Align ignition coils to connectors and place all connectors evenly on ignition coils.
- Press ignition coils evenly by hand onto spark plugs (do not use a hammer under any circumstances).
Tightening Specifications
W12
Left cylinder bank
- Remove cover behind intake manifold - arrows -.
- Remove left cover in engine compartment - arrows -.
- Remove left air guide hose - arrows -.
- Remove vacuum hose - arrow - to brake booster on left side part of intake manifold.
- Disconnect electrical connector - 4 -.
• When loosening bolt - 1 -, secure threaded plate against falling off.
- Remove bolts - 1 through 3 - and remove left side part of intake manifold.
Right side
- Remove right cover in engine compartment - arrows -.
- Remove right air guide hose - arrows -.
- Remove oil filler tube cap.
- Disconnect electrical connector - 1 -.
• When loosening bolt - 4 -, secure threaded plate against falling off.
- Remove bolts - 2 through 4 - and remove right side part of intake manifold.
- Disconnect electrical connectors - 1 - on ignition coils - 2 -.
- Remove ignition coils from spark plugs with (T10166).
- Remove spark plugs using (3122 B).
Installing
Installation is done in reverse sequence while observing the following:
• Replace seals.
• Push ignition coils by hand into intended resources in cylinder head cover.
Tightening Specifications
* No tolerance, maintain exact tightening torque.