Pontiac Bonneville engine dies unexpectedly while driving at various speeds, intermittent starting issues on Pontiac Bonneville

Some Pontiac Bonneville owners report experiencing unexpected engine stalling while driving at various speeds and intermittent starting issues. These problems can manifest as engine stalling regardless of speed, including when the gas pedal is not pressed, and may require towing due to sudden engine shutdowns. Common causes identified include failures of the mass air flow and crankshaft position sensors, which are known to lead to stalling, as well as engine timing issues that can result in misfires. Additionally, problems with the Variable Valve Timing (VVT) system may contribute to stalling and poor engine performance. Owners are advised to start diagnostics by checking for stored trouble codes and testing the crank sensor to identify the underlying issues. Repair solutions may involve replacing faulty sensors or addressing engine timing and VVT system concerns to resolve these stalling issues effectively.