Solved Case: P0300 Traced to an Intake-Manifold Leak
A warm rough idle and multi-cylinder misfire counters appeared together, while the engine smoothed out above idle.
Category Solved Cases
Composite cases with a confirmed test result, a focused repair, and a verification step.
Solved Case: Crank/No-Start From Main-Relay Voltage Drop
The engine cranked normally but lost controller and injector supply under load through a heat-sensitive relay contact.
Solved Case: Repeat Brake Vibration Caused by Hub Runout
Brake pulsation returned after rotor replacement because the installed disc inherited lateral runout from corrosion on the hub face.
Solved Case: Warm A/C at Idle From Missing Fan Command
Vent temperature climbed at idle while high-side pressure rose and condenser airflow remained low.
Solved Case: U0100 Caused by a Loaded ECM Ground
Multiple modules stored lost-communication codes when a corroded ground connection developed excessive voltage drop.