Cylinder five showed a negative timing deviation of -12 degrees at 3,000 RPM. Then she cross-referenced it with camshaft adaptation. Cylinder five’s intake cam was drifting wildly.

The software booted with a familiar chime. It looked ancient. The interface was utilitarian, no animations, no cloud nonsense. Just raw, beautiful data.

“It’s not the coil pack,” Elena whispered, her heart racing. “It’s not the injector. It’s the variable valve timing solenoid on the intake bank. It’s failing intermittently.”