There could be an issue with the fuel regulator. Try starting it if theres no joy then move on to checking pressure on the fuel rail. If not then we should change the filter first to ensure were not dealing with a plugged fuel filter. If its wet your getting fuel this is good if its dry your not getting fuel. If can hear the pump and you didnt get any codes then pull a plug after cranking the engine for a while, maybe 30 seconds of cranking. If you dont hear this then your not pumping fuel and your car wont start. You should hear a humming sound for about 3-5 seconds coming from the rear of the car when you turn the key on without cranking the engine. Also listen for the fuel pump does it hum when you turn on the ignition on without turning the motor over. This will eliminate a lot of things or point straight to your problem. In addition, spark plug threads should be plated to prevent seizing in aluminum cylinder heads.Not sure what the mechanic was trying to accomplish there. Since heat range and electrode design are very important to preventing misfires, any long-life spark plug should be replaced with exactly the same heat range, shell and tip design. These configurations create a stable spark kernel at the high cylinder pressures used in GDI and turbocharged or supercharged engines. Many long-life spark plugs also feature very hard iridium-alloy center electrode designs that terminate into sharp needle-point configurations ( see Photo 2). In contrast, spark plugs now last 100,000 miles or more because their electrodes are coated with precious metals that resist electrode wear. THE MODERN SPARK PLUGДue to rapid electrode wear, conventional mild-steel spark plugs used on older engines had to be replaced at intervals of 36,000 miles or less ( see Photo 1). Also, its mild steel shell can allow the spark plug to seize in an aluminum cylinder head. Photo 1: A conventional spark plug should never be used in a long-life application because its electrodes quickly erode. Adding turbocharging or supercharging further increases running compression, which subsequently increases the load on the spark plugs. The engineвЂ™s torque output can be improved by increasing intake and exhaust valve overlap, which, in turn, increases running compression at higher engine speeds. If variable valve timing (VVT) is added, fuel economy can be increased by reducing intake and exhaust valve overlap, which increases running compression at low engine speeds. If the throttle is suddenly snapped open on a naturally aspirated engine, its running compression will usually exceed its cranking compression by as much as 10% to 20% because the engineвЂ™s volumetric efficiency often increases with engine speed. In contrast to cranking compression, a naturally aspirated engine with conventional port fuel injection and valve timing might produce about 80-90 psi running compression at idle speed. Cranking compression, for example, might range between 180 to 200 psi at sea level. The operating stresses on modern spark plugs are increased because modern engines are generally designed to operate at maximum running compression. The symptoms of a loose insulator tip can include intermittent, rough-running performance complaints. The porcelain insulator tip on this spark plug has broken loose at its base due to a hard impact.

How to install spark plugs on rx8