November 2020 Archives - UnderhoodService
Fuel Injector Waveform Diagnostics

On the majority of injectors, an electromagnetic coil is energized by a driver in the engine control module.

Freeze Frame Diagnostics

Freeze frame data is a “snap shot” of when the code occurs of the specific sensor PIDs.

Diagnosing Crankshaft Position Sensors

Modern engines need to not only know the position of the crankshaft, but the position of the camshafts.

Belt Alignment Measurement

The first point of inspection is the belt. Listen for the most common noise: a chirping noise.

Gapping Spark Plugs

For modern fine-wire spark plugs, you should not measure the gap unless instructed by the manufacturer.