Subaru B9 Tribeca throttle body issue causing stalling and failure to start on Subaru B9 Tribeca

Some Subaru B9 Tribeca owners report experiencing throttle body issues that lead to stalling and failure to start. Common symptoms include dirt and grime buildup, the check engine light activating, and erratic idling. A dirty throttle body can particularly cause stalling when coming to a stoplight. Owners may find that their engine cranks but does not start, despite having adequate fuel pressure and spark, indicating a potential throttle body problem. Carbon buildup in the electronic throttle body over time can contribute to these stalling and starting issues, as can airflow disruptions at low speeds. Cleaning the throttle body is often a recommended solution to address these problems, though replacement may be necessary if cleaning fails, with costs starting around $735. Additionally, performing a throttle body relearn after cleaning or replacement is crucial for proper functioning. Regular maintenance, including checking air filters, the fuel pump, ignition system, fuel injectors, and mass airflow sensor, can help prevent these stalling issues and improve overall engine performance.