Mazda 626 starting issue after timing belt and sensor replacement, engine ran poorly before failure on Mazda 626

Some Mazda 626 owners report experiencing starting issues after a timing belt and sensor replacement, often linked to improper timing belt installation which can lead to significant engine performance problems. Additionally, if a sensor replacement triggered the engine light, it may indicate complications related to that replacement. Some owners have identified a faulty throttle positioning sensor as a cause for a no-start condition following a timing belt replacement. Others encounter a "crank but no start" issue, which can stem from various factors such as a faulty fuel pump, clogged fuel filter, or malfunctioning ignition components. Symptoms like rough idle, stalling, and shaking may also suggest underlying engine performance issues. To prevent further damage, it is crucial for owners to address these mechanical concerns promptly and seek a thorough inspection by a qualified mechanic to diagnose and resolve the root causes effectively.