Hearing a loud machine gun rattle on cold starts in your 2017–2020 Ford F-150 EcoBoost? This systemic cam phaser failure leads to expensive timing chain stretch and P0011/P0021 codes. At The Car Conservatory, we move beyond basic repair using Engineering Fault Tree Analysis and CKP/CMP oscilloscope correlation to isolate the root cause. From installing updated CD series phasers to verifying hot-idle oil pressure, we rectify the engineering deficiency. Schedule your precision