With great difficulty unless you have the correct socket!
I have dozens of spark plug sockets for many different types of plugs and none of them will fit down the hole in the cam cover, you need the special Mazda socket that fits in the hole.
Really silly the way they've done it, you have to spend about seven quid on a socket that you'll probably use just once!
The spark plugs on the Mazda 323 Astina are located on the engine cylinder head, typically near the top of the engine. To access them, you may need to remove the engine cover and any components obstructing the spark plug wells. Depending on the engine configuration, the spark plugs can be found in a straight line or in a staggered arrangement. Always refer to the specific service manual for your model for detailed instructions.
To replace the spark plugs on a 2002 Mazda 323 Astina, start by ensuring the engine is cool and disconnect the negative battery terminal. Remove the ignition coil or spark plug wires, depending on your engine configuration, and use a spark plug socket to carefully unscrew the old spark plugs. Before installing the new plugs, check and adjust the gap as specified in your owner’s manual. Finally, install the new plugs, reconnect the ignition components, and reattach the battery terminal.
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To troubleshoot a Mazda 323 that is starting, turning over, and getting fuel, check the spark plugs first. You should also ensure the air filter is clean.
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The gap for spark plugs in a Mazda 323 typically ranges from 0.039 to 0.043 inches (1.0 to 1.1 mm) depending on the specific model and year. It is crucial to consult the vehicle's manual or a trusted automotive resource to ensure the correct gap for optimal engine performance. Using a gapping tool, carefully adjust the spark plug gap to the manufacturer's specifications before installation.
The correct gap for these spark plugs is 1.1mm. When you buy new plugs they should already be adjusted to the right size. My car book says to look underneath the hood at the engine specifications.
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1.00-1.10mm
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If it's electronic ignition the plug gap should be 1.1mm you buy spark plugs already sized (NGK BP5ES-11) It depends on what type of spark plugs you are using. For conventional plugs the gap of 1.0 - 1.1 mm (0.039 to 43") is correct. If you are running Platinum plugs, I like to gap at 0.005" extra (0.44 - 0.048"). I get good performance with NGK 7082 Platinum. Cheers Malcolm
With an uncle and a hammer.