AC Delco iridiums
spark plug
.043
follow the plug wires they are on the heads
The 2004 Trailblazer does not have plug wires. It has a coil pack per cylinder that connects direct to the spark plugs.
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.
If the car will not start...the spark-plug is bad.
Spark plug gap chevy ls blazer
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.
That's the forward-most spark plug on the passenger side.
The 2004 Chevy Express 6.0 liter motor spark plug gap is .032. Most spark plugs will come pre-gapped from the spark plug manufacturer.
0.040
.044 in