How do you diagnose 1990 Mazda Miata that bucks and stalls after fifteen minutes of driving and will not restart until engine is completely cooled in one hour?

Answer 1

To diagnose a 1990 Mazda Miata that bucks and stalls after 15 minutes of driving, start by checking for overheating issues, as the engine may be shutting down due to temperature-related problems. Inspect the ignition system, particularly the ignition coil and spark plugs, as they may fail when hot and cause stalling. Additionally, examine the fuel system for issues like a clogged fuel filter or failing fuel pump that could restrict fuel flow when the engine warms up. Finally, use an OBD-I scanner to check for any error codes that could provide insight into the underlying issue.