under the resonator air inlet box. on the valve cover youll see the coil packs. remove the single bolts. pull up the coil pack until the boot clears the valve cover. change plug. reinstall the coil pack and move on to the next. easy. can be done in 30 minutes.
AC Delco Iridiums
follow the plug wires they are on the heads
A 2004 Chevrolet Trailblazer that has a 4.2 liter engine will have a spark plug gap of .044 inches. The best spark plugs for this vehicle are iridium spark plugs.
The 2004 Trailblazer does not have plug wires. It has a coil pack per cylinder that connects direct to the spark plugs.
spark plug
.043
AC Delco iridiums
i have not found specs. make sure they are firm.
Remove the spark plug wires from your 2004 Chevy Malibu spark plugs. Remove the old spark plugs with a 5/8 deep well socket, by turning the socket to the left. Reverse the process to install the new spark plugs.
If it is the inline 6 cylinder.............6 If it is the V-8............8
you don't, you buy a chevy.
Where is the starter on a 2004 Chevy trailblazer.