Buick Riviera engine shuts down during long drives, requires 15 minutes to restart on Buick Riviera

Some Buick Riviera owners report experiencing engine shutdowns during long drives, requiring a 15-minute wait before they can restart the vehicle. This issue may stem from a failing Engine Control Module (ECM) or problems with fuel delivery, ignition, or the Engine Control Unit (ECU). Specific causes for these shutdowns can include a faulty fuel pump, empty fuel tank, dirty fuel filter, or issues with sensors like the crankshaft position sensor, MAF sensor, or MAP sensor. Additionally, some owners have noted that a clogged fuel filter, weak fuel pump, or faulty alternator can lead to stalling when stopping or slowing down. In certain cases, the IAC motor may become stuck due to dirt, causing the engine to stall but regain idle after a brief period. It is recommended that owners have their vehicles inspected by a qualified mechanic to identify and resolve these issues promptly, ensuring safe and smooth operation on the road.