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Ignition Coils: Installation

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install ignition coil(s) into engine. Ensure ignition coil(s) are properly seated to the valve cover. Install and tighten ignition coil retaining bolt(s) to specification. See TORQUE SPECIFICATIONS .
  2. Reconnect ignition coil(s) harness connector(s). Reinstall air cleaner resonator. Tighten air cleaner resonator mounting bolts and air cleaner resonator-to-throttle body clamp to specification. Connect negative battery cable and tighten negative battery cable-to-battery bolt to specification.


  1. Install ignition coil. Install the ignition coil bolts. Tighten the bolts to specification. See TORQUE SPECIFICATIONS . Connect harness connector(s) to appropriate ignition coil(s).
  2. Inspect the wire for proper installation. Push sideways on the boot(s) in order to inspect the seating. Reinstall any loose boot(s).
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