NC MX5 Engine Misfire
The early model NC MX5 (2005-2006) can suffer from an engine misfire caused by damaged wiring to the coils. This is usually first noticed as an intermittent engine misfire that develops into a full misfire in time. Another symptom can be “popping” from the exhaust on overrun.
We carry a spare plug all set up and ready to go in the event of a failure. As you can see 2 of the wires are a much thicker gauge than the last one. The last one (coloured) is always the one that breaks and the break is just as the wire exits the grey plug.
The main cause of this is the wiring is unsupported and the weight of the harness over time causes the wiring to fail.