Toyota 90080-91180
Spark Plug

A proper spark plug service for the 2AZ-FE ignition system begins by disconnecting the negative battery terminal cable before waiting 90 seconds to avoid activating seat belts pretensioners and Air Bags. Next, remove the engine cover. The next step requires you to disconnect 4 ignition coil connectors before uninstalling the assembly through removal of its 4 bolts and 4 coils.

The 2AZ-FE ignition system spark plug service and repair process begins with taking off two nuts and the engine cover sub-assembly of the No. 1 position. The service begins by disconnection of 4 ignition coil connectors followed by removal of the 4 bolts along with 4 ignition coils. Finally, remove the 4 spark plugs.

Prior to spark plug installation in the 2AZ-FE ignition system start with 4 spark plug torque applications of 19 Nm (194 kgf-cm, 14 ft-lbf). Install 4 ignition coils through their respective bolts before tightening them to 9.0 Nm (92 kgf-cm, 80 in-lbf) while connecting each ignition coil connector. Afterward, inspect the ignition timing. You must complete the installation by fastening the No. 1 engine cover sub-assembly with 2 nuts that require 9.0 Nm torque (92 kgf-cm, 80 in-lbf).

The proper tool for fitting the 1AR-FE spark plugs requires the use of a spark plug wrench at 25 Nm torque (254 kgf-cm, 18 ft-lbf). Mount the 4 ignition coil assemblies by using the 4 bolts and maintain a torque at 10 Nm (102 kgf-cm, 7 ft-lbf) on each bolt. The 4 ignition coil assembly connectors must be joined before inserting the No. 1 engine cover sub-assembly.

The installation process for 2ZR-FE spark plugs requires a 14 mm spark plug wrench for fitting 4 plugs where torque should reach 20 Nm (204 kgf-cm, 15 ft-lbf). The 4 ignition coil bolts receive 10 Nm (102 kgf-cm, 7 ft-lbf) torque installation along with caution to avoid damaging the plug cap on the engine head cover opening and the upper edge of the spark plug tube. The final step is to join the 4 ignition coil connectors before placing the No. 2 cylinder head cover into position.

Service and repair the spark plugs on a 2GR-FE engine can commence after removing both the engine under cover assembly and the No. 1 engine under cover. To start begin draining the engine coolant but before doing so remove the V-bank cover sub-assembly. First remove front wiper blades and arm assemblies from both sides of the vehicle then move on to separate the cowl top ventilators followed by uninstalling windshield wiper motors with links. First disconnect the main wire in the engine room while also removing the outer cowl top panel sub-assembly. The first step includes the removal of throttle body bracket and the No. 1 surge tank stay. The technician should first untighten the intake air surge tank assembly and then disconnect the air cleaner cap sub-assembly. The ignition coil assembly needs removal through 4 bolts [A] and nut [B] extraction followed by 2 harness clamp [C] disconnection and cancellation of 6 ignition coil connectors before using bolts and ignition coils for removal. Remove the 6 spark plugs as the final step of the process.

The process of installing spark plugs for a 2AZ-FE engine control starts with tightening each of the 4 spark plugs to 19 Nm (194 kgf-cm, 14 ft-lbf). The 4 ignition coils need installation using 4 bolts that require torque of 9.0 Nm (92 kgf-cm, 80 in-lbf). You must install the No. 1 engine cover sub-assembly after connection of all 4 ignition coil connectors.

The service and repair procedures for spark plugs are not provided by Toyota. Each Sienna ignition bank contains three ignition coils that protect spark plugs underneath them. Before accessing the plugs close to the firewall both the FR cowl top assembly and V-bank cover might need removal.

Install the 4 ignition coils using the 4 bolts, ensuring a torque of 9.0 Nm (92 kgf-cm, 80 in-lbf), and connect the 4 ignition coil connectors.

Install the No. 1 engine cover sub-assembly by securing it with 2 nuts at a torque of 9.0 Nm (92 kgf-cm, 80 in-lbf).

Take care not to damage the plug cap on the engine head cover opening or the upper edge of the spark plug tube.

Fully tighten the No. 1 surge tank stay and the throttle body bracket.

Remove the 4 spark plugs.

Begin by removing the No. 1 engine cover sub-assembly.

Connect the 6 ignition coil connectors.

Install the 6 ignition coils with the 6 bolts.

Disconnect the 6 ignition coil connectors and remove the 6 bolts along with the 6 ignition coils.

The 6 bolts.

A 16 mm plug wrench.