The 2005 Chevy Trailblazer has Coil-On-Plug ignition coils so there are 6 "coil packs". Each one is mounted on top of the spark plug.
you dont. it has coil springs.
under each coil
spark plug
Bad spark plugs, coils are coil, bad injector. Cam are crankshaft sensor
All the coils are the same, each one must be connected to the connector for the cylinder the coil is connected to the spark plug for
Down the center of the head under the intake box. You have to remove each coil with one 10mm bolt and then the plugs are easily accessed.
The ignition module, Ignition coil, Pick-up coil bad coil wire.
On the 4.2 inline 6, the 4th cylinder from the front of the engine is number 4. The engine is a coil on plug, the spark plug is located under the coil in the center of the valve cover.
right on the valve cover under the air inlet hose and manifold. indiviual coil packs per cylinder. easy to change.
it is mounted to the starter !
The 2004 Trailblazer does not have plug wires. It has a coil pack per cylinder that connects direct to the spark plugs.