OEM 2004 Chevrolet Trailblazer Spark Plug

2004 Chevrolet Trailblazer Parts Questions & Experts Answers

• Q: How to replace spark plugs in an engine on 2004 Chevrolet Trailblazer?

  A: After shutting down the ignition system start by removing the ignition coils before proceeding with the replacement of spark plugs. You should let the engine cool down first since trying Spark Plug removal from hot engines may stick threads into the Cylinder Head which results in thread damage. The Spark Plug recess area needs cleaning because foreign objects may damage the threads and prevent proper seating of new plugs; a thread chaser (Tool Required: Thread Chaser) should be used to clean this area. Pull the spark plugs out from the engine compartment. The vehicle demands specific Spark Plug types when conducting new installations because using incorrect heat levels can result in severe engine damage. The pre-set gaps of new spark plugs need to be evaluated with a round feeler gage since handling may have altered them; this measurement should match the manufacturer's recommended specifications. To achieve proper installation of spark plugs into the Cylinder Head users should use a thread chaser to remove old bolts and grease from threads before securing the plugs fully into position. Any improper tightening of Spark Plug threads or partial plug seating techniques may result in overheating while also leading to exhaust blow-by along with thread damage. The installation should begin with tightening each Spark Plug to 18 n.m (13 lb ft) before reattaching the ignition coils.