Fuel Injector — Solenoid Pulse

What it tells you

The injector driver pulls the circuit to ground for the pulse width, then releases — the sharp inductive kickback spike that follows confirms the solenoid is healthy. A scope shows pintle bumps, weak coils, and driver faults invisible to a scan tool.

Symptoms this catches

• ▸lean
• ▸rich
• ▸rough idle
• ▸dead cylinder
• ▸fuel trim
• ▸no start

Watch the walkthrough