What kind of spark plugs do I need for a Mazda MX-5 Miata?
The higher the number the colder the plug in the NKG range. Source Diagram from NKG Mazda recommends that the MX-5’s use 5 or 6 heat range NKG spark plugs for the NB8B and NA 1.6’s. NKG parts BKR5E-11 or BKR6E-11 are for the NB8B 1.8 litre and a further option for the cooler BKR7E-11 is for the 1.6 litre NA’s.
Why is my spark plug not working on my Miata?
Change the wires! In case you forget which plugs is which, refer to the firing order diagram below. This is caused by breakdown of the insulation on the wires which results in the spark arcing through the insulation to the metal valve cover instead of through the spark plug electrodes.
How long do ignition wires last on a Miata?
The factory ignition wires on the Miata only seem to last between 30,000 and 50,000 miles. If you are experiencing misfiring and hesitation and you haven’t changed your wires, this is most likely the cause. Change the wires! In case you forget which plugs is which, refer to the firing order diagram below.
How do you check the ignition on a Miata?
An easy way to check is, pull #1 spark plug, and drop the dipstick down the hole. Turn the motor by hand and watch the dipstick until it peaks at top dead center. This will tell you the crank shaft is at TDC. Now check to see where the timing mark on the crank pulley lines up.
How long do spark plugs last in Mazda Miata?
Maintenance. Spark plugs in engines using lead-free fuels and electronic ignition systems, as in the MX-5, last for around 30,000 Kms before spark plug service is required.
Where are the spark plugs on a Mazda MX 5?
The spark plugs sit on top of the cylinders on a MX-5. Looking at the engine you can see a set of spark plug leads running down the engine with 4 rubber boots in the centre of the engine’s rocker cover. The spark plugs are set about 80mm under those rubber boots.
Why are spark plugs shaped the way they are?
The ceramic’s shape also means that there is a gap between the plug’s metal jacket and the ceramic. Therefore the contact area between the ceramic and the plug’s metal jacket is reduced. This smaller contact area results in a slower transfer of heat from the plug to the cylinder head.