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).