How to Replace the Ignition Coil in a Chevy TrailBlazerby Tara Kimball
The ignition coil in your Chevrolet TrailBlazer generates the spark needed by the distributor to ignite the fuel vapor and keep your engine running. If your TrailBlazer’s engine is cutting in and out, skipping or seems to have lost power, the coil may be to blame. If not caught early and the coil fails completely, the engine will not run. You can find a replacement coil at most auto parts stores or a Chevrolet dealership.
Remove the negative battery cable from the negative battery terminal using a wrench. Set the cable aside so it is isolated from the battery.
Locate the ignition coil on the top of the passenger’s side of the engine, about halfway up the engine block. Disconnect the wiring connectors on the side of the coil. Disconnect the coil wire. The wiring connectors and coil wire should simply pull straight out.
Remove the nuts securing the ignition coil and bracket to the engine using a wrench or socket and ratchet and remove the studs.
Drill out the rivets securing the coil to the mounting bracket. Remove the bracket and coil from the engine compartment. The new coil will include nuts and bolts to secure the new coil to the bracket.
Secure the new coil to the bracket using the nuts and bolts included with the coil kit. Connect the coil and bracket assembly to the engine using the studs and nuts. Torque the nuts to 20 foot-pounds with a torque wrench.
Reconnect the coil wire and the wiring connectors on the side of the ignition coil. Reconnect the negative battery cable then test the ignition coil by starting the vehicle.
- "Haynes Repair Manual; 2002-2007 Chevrolet TrailBlazer and GMC Envoy;" Haynes Manuals, Inc.; 2009
Things You'll Need
- Wrench set
- Socket and ratchet set
- Torque wrench
Tara Kimball is a former accounting professional with more than 10 years of experience in corporate finance and small business accounting. She has also worked in desktop support and network management. Her articles have appeared in various online publications.