P0021 on Ford

Multiple Bronco owners report a brief but pronounced rattling or knocking noise on cold start caused by worn or defective cam phasers, often accompanied by timing chain slack. Ford issued service guidance for EcoBoost engines using updated phaser parts. While some vehicles only exhibit noise, others progress to rough running, check-engine lights, or repeat repairs if only partial components are replaced.

On the 2011-2019 transverse Explorer, Ford located the water pump INSIDE the engine, behind the timing cover, driven off the primary timing chain. When the pump's internal shaft seal fails, coolant first weeps from a passage on the passenger side of the block, but if ignored (or if the bearing fails) coolant is dumped directly into the crankcase, contaminating the oil ('milky' oil) and risking bearing/engine destruction. Because the pump is buried behind the timing cover, replacement is a 10-12+ hour teardown. This generated a class-action lawsuit (no recall was issued). Typical onset is roughly 100k-200k miles but failures as early as ~60k miles are documented in NHTSA complaints.

3.5L EcoBoost-equipped Explorers (Sport, Platinum, and Police Interceptor Utility) commonly develop a rattling/knocking noise for 1-3 seconds on cold start-up caused by worn variable camshaft timing (VCT) phasers. The phaser lock pins fail to hold the cam sprockets in position after shutdown, so the phasers rattle against the timing chain until oil pressure builds. Over time the phasers and primary chain wear further, the rattle lengthens, and severe cases can throw cam/crank correlation codes or cause internal timing damage. Ford issued a TSB and released redesigned phasers with improved locking pins.

The 5.0L Coyote V8 can develop a ticking or rattling noise at startup, often from the cam phasers. This is similar to issues in the Mustang GT. The noise typically diminishes after the engine warms up but can indicate phaser wear.

Distinct from the cam-phaser cold-start rattle, the first-generation (2011-2016) 3.5L EcoBoost suffers genuine primary timing-chain wear ('stretch') because of its long chain routing and the high loads of a twin-turbo direct-injection V6. As the chain pins and rollers wear, the cam-to-crank relationship drifts and the PCM logs P0016 (and related correlation codes). The first symptom is usually a brief metallic rattle on cold start that worsens over time. Wear typically appears around 100,000-150,000 miles, often accelerated by extended oil-change intervals. Left unrepaired, the chain can skip teeth or break, causing catastrophic valve-and-piston contact. This is a high-demand search because the 3.5 EcoBoost is the volume engine in millions of F-150s.

The 2004-2010 5.4L 3-valve Triton uses variable cam timing (VCT) phasers fed by clean, high-pressure engine oil. With infrequent oil changes or normal high-mileage wear, the phasers' internal vanes and locking pins wear out, the plastic timing-chain guides crack, and the hydraulic chain tensioners bleed down. The result is the notorious 'death rattle' — a loud rattle/knock on cold start and a metallic ticking at hot idle. Owners report symptoms as early as 50,000-100,000 miles. If ignored, a worn phaser or skipped chain can cause valve timing to drift (rough running, P0011/P0021/P0016 cam-correlation codes), loss of power, and in worst cases chain jump and valve-to-piston contact destroying the engine. This is one of the single most-searched, most-complained-about Ford truck engine problems of the era and a major shop money-maker.

Two distinct tick patterns affect 5.0L Coyote V8 in 2015-2023 Mustang depending on engine generation. Gen 2 Coyote (2015-2017): light tick at idle and on cold start, commonly attributed to valve lash / lifter operation; generally cosmetic and not associated with engine damage. Gen 3 Coyote (2018-2023): louder, more pronounced tick — same family but Ford changed to plasma transferred wire arc (PTWA) cylinder liners. The tick is increasingly linked to piston slap from clearance issues against the plasma liner, with some confirmed cases of cylinder wall scoring requiring engine replacement under warranty. Direct injection (added on Gen 3 alongside port injection) contributes a separate fainter HPFP tick that is normal. Distinguishing: Gen 2 tick stays constant warm; Gen 3 piston slap diminishes as engine warms but returns under load. Owner forums (Mustang6G, MPR Racing Engines) document the Gen 3 pattern extensively.

The 3.5L Duratec V6 in later model Taurus vehicles develops cam phaser rattle on cold starts due to worn variable valve timing actuators and depleted oil control valve seals.