We consider how to replace the spark plugs on the 2003 – 2007 Accord 4cyl and why you must do this together recommended in the maintain schedule. This should be done every 105,000 miles on the 2003 come 2007 Honda Accord 4 cylinder engine.

You are watching: 2004 honda accord spark plug replacement

Some spark plug info:

Spark plugs work in an extreme heated environment; the combustion chambers, and have 2 basic functions. The an initial is the an ext common:

Provides the spark to ignite the air-fuel mixture.Cooling: Dissipates warmth from the combustion chamber to the engine’s cooling system. The ability of a spark plug come dissipate warmth from the firing end to an engine’s cooling device is known as its heat range.

Its constantly best to replace spark plugs at the recommended mileage. This ensures that the 2 above functions room performed at optimum levels. It’s not the ideal to allow your engine to begin misfiring or hesitating as result of worn spark plugs before you do a change. It outcomes in negative gas mileage and could damage the engine.

Equally important throughout spark plug changes is that you use the recommended spark plug because that the vehicle, if not, you will have poor ignition the the air-fuel mix bring about unburned fuel left in the combustion chamber. This find its method to the catalytic converter where it will melt the substrate. Making use of the dorn spark plug also method having a plug v an out-of-spec heat range for the vehicle. This can an outcome in under or overheating of the vehicle.

Down come business….

Materials: 10mm wrench, 16mm spark plug socket, ratchet extension (30cm if fine), and also 4 the NGK IZFR6K-11 or Denso SKJ20DR-M11 (some will usage NGK IZFR6K-13 or Denso SKJ20DR-M13).


1. Remove the 4 bolts securing the ignition coil cover.

To prevent dirt indigenous entering the burning chambers, blow off any dirt uncovered in this recess.

2. Remove the 4 bolts securing the ignition coils

3. Eliminate the ignition coils and note the corresponding cylinder every coil come from. You will return every coil come its corresponding cylinder. To eliminate a coil, pry that up.

Once pried up, boring the tab ~ above the electrical connector and detach the connector. If the connector is difficult to remove carry out not pull on the cable itself. You can use a level screwdriver to tenderness pry turn off the connector while keeping the tab depressed.

4. Eliminate the spark plugs utilizing the spark plug socket and extension.

Always check the problem of the old spark plug. It have the right to tell a many on the health and wellness of the car. A brownish to tan colouration that the firing finish is normal.

See more: What Is The Temperature Of Room Temperature Water ? Cold Water Vs

5. Download the new spark plugs and also follow turning back steps. Very first tighten plugs through hand until contact is made through the cylinder head then torque to 18Nm. If girlfriend don’t very own a torque wrench, tighten 2/3rds that a rotate after hand tightening has actually made contact with the head. Mental to use the correct plug for this car as shown.