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 plugs last on a Miata?
OEM plugs usually are somewhere in the middle. Common Problem! 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!
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.
What should the idle RPM be on a Miata?
Factory spec for the Miata specifies standard timing as 10° before top dead center (10° BTDC) ±1° at idle speed(850 rpm). If your timing is advanced more than this, you may experience pinging under some conditions. Dirty spark plugs Metallic burr in cylinder
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.
OEM plugs usually are somewhere in the middle. Common Problem! 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!
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.