Diagnosing a Stuck Thermostat: 2010 Ford Fusion 2.5L
2026-10-02
OBD-II datalogging traces a 2010 Ford Fusion 2.5L's flow-dependent cooling fault to a stuck thermostat, then confirms the fix with before/after temperature data.
Obd Ii
The Idle Hunt: Diagnosing an Intermittent Near-Stall With Nothing But OBD-II Logs
2026-09-15
My 2010 Fusion had an intermittent idle hunt and near-stall that never once threw a check-engine light. Here's how weeks of OBD-II log analysis - and a couple of wrong turns - tracked it to a single failing part, plus the data-analysis techniques that made it possible.