How big is the primary coil on a Miata?
Primary Coil: .78-.94 Ω Secondary Coil: 11.2-15.2 kΩ Primary Terminal to Case (insulation check): greater than 10M Ω Spark plug wires should be in good condition and securely fastened to the coil packs and spark plugs.
What should the spark plug gap be on a Miata?
Spark plug gap out of spec. As spark plugs wear, the gap between the electrodes tends to get a bit wider. The standard gap on the Miata’s spark plug should be 1mm. A wider gap may result in misfiring due to the voltage not being quite high enough to cause a spark across the electrodes. Warning on Compression Checks
What is the ignition timing on a Miata?
Timing advanced too far Advanced timing means that the spark which ignites the fuel mixture in the cylinder occurs before the piston reaches top dead center of its excursion. Factory spec for the Miata specifies standard timing as 10 before top dead center (10 BTDC) 1 at idle speed (850 rpm).
Why are the ignition wires on my Miata not working?
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! In case you forget which plugs is which, refer to the firing order diagram below.
Primary Coil: .78-.94 Ω Secondary Coil: 11.2-15.2 kΩ Primary Terminal to Case (insulation check): greater than 10M Ω Spark plug wires should be in good condition and securely fastened to the coil packs and spark plugs.
Timing advanced too far Advanced timing means that the spark which ignites the fuel mixture in the cylinder occurs before the piston reaches top dead center of its excursion. Factory spec for the Miata specifies standard timing as 10 before top dead center (10 BTDC) 1 at idle speed (850 rpm).
Spark plug gap out of spec. As spark plugs wear, the gap between the electrodes tends to get a bit wider. The standard gap on the Miata’s spark plug should be 1mm. A wider gap may result in misfiring due to the voltage not being quite high enough to cause a spark across the electrodes. Warning on Compression Checks
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! In case you forget which plugs is which, refer to the firing order diagram below.