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All pictures and texts in this web page are the property of nomaallim.com. Any use of any part of those contents without the written consent of nomaallim.com shall be subject to legal procedures as per international and local laws in the concerned country. Using the name "nomaallim" or "nomaallim com" or "nomaallim.com" in the text describing the unauthorized copied content shall not constitute an exception and shall be sanctioned in accordance to the effective laws and proceedings.
BEFORE YOU START
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NOTE: the below concerns a Mazda ZY 1.5L engine but works are identical or similar on other Mazda petrol engine versions.
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DISCLAIMER:
Our pictorials are of informative nature and do illustrate works carried by ourselves at our own premises for our own use and satisfaction.
Readers who envisage to carry out similar works inspired by the below method shall do this at their own risks and liability.
Our pictorials are of informative nature and do illustrate works carried by ourselves at our own premises for our own use and satisfaction.
Readers who envisage to carry out similar works inspired by the below method shall do this at their own risks and liability.
Mazda 2 / Demio spark plugs removal
Start by removing the air filter, click here to visit our specific page.
Remove the 3 bolts that hold the air box / air filter assembly.
One of them is on the back side but can be easily accessed and removed.
Remove the 3 bolts that hold the air box / air filter assembly.
One of them is on the back side but can be easily accessed and removed.
Unclip the air inlet duct and take out the air box assembly as shown in the picture to the right.
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Unscrew the collar that holds the air hose which connects to the air filter cover housing (left) and tilt the air filter cover housing up, then hold it in place with a large screwdriver (right).
You can now see the 4 coils.
Remove the bolt that holds the COP then gently pull up and take out the COP (middle).
Use a 16 mm socket to unscrew the spark plug.
Remove the bolt that holds the COP then gently pull up and take out the COP (middle).
Use a 16 mm socket to unscrew the spark plug.
You can then use a magnet pick-up tool to take out the spark plug.
Inspect each spark plug for each cylinder separately (see the link further below for performing an engine diagnostic out of your spark plugs).
The electrodes should look light brown as shown in the picture to the right.
Check the gap between electrodes. It should be between 1 to 1.1 mm.
If your spark plugs have more than 45,000 km, replace them.
Tighten to 2.5 mKg (18 ft-lb) when refitting.
Inspect each spark plug for each cylinder separately (see the link further below for performing an engine diagnostic out of your spark plugs).
The electrodes should look light brown as shown in the picture to the right.
Check the gap between electrodes. It should be between 1 to 1.1 mm.
If your spark plugs have more than 45,000 km, replace them.
Tighten to 2.5 mKg (18 ft-lb) when refitting.
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Checking the COPs and Spark Plugs condition
Inspect well the COPs for the below failures:
- Cracks or traces of burns on the insulator
- Cracked rubber (boot)
- Presence of the spring that connects to the plug
- Integrity of the seal, where it plugs the spark plug well and seals it.
- Color of electrodes
- Condition of electrodes and how worn they are
- Burns on the insulator
- Presence of oil or water on the electrodes
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Mazda 2 / Demio spark plugs refitting
Like for any engine, do not drop the spark plugs into their wells, rather place them with a magnet tool or dedicated socket equipped with a rubber plug holder.
Tighten by hand first, then to a torque of 2.5 mKg.
Clean well the COPs with a dry shop towel, you may use an electronic cleaner spray.
If you were facing misfires from time to time in a particular cylinder, insulate the COPs with a dielectric silicone, check our below link for details.
Clean well the plastics around the COPs from dust, mud, water, etc. prior to refitting the cover.
Tighten by hand first, then to a torque of 2.5 mKg.
Clean well the COPs with a dry shop towel, you may use an electronic cleaner spray.
If you were facing misfires from time to time in a particular cylinder, insulate the COPs with a dielectric silicone, check our below link for details.
Clean well the plastics around the COPs from dust, mud, water, etc. prior to refitting the cover.
