Guides
WaveWrench Pro Guides
Practical diagnostics reference for automotive scope work and engine-sound analysis. Start with the fundamentals, or jump straight to the pattern you're chasing.
Prerequisites
Verify these before trusting any waveform, scan-tool reading, or drivability diagnosis.
Oscilloscope fundamentals
Start here if you're new to lab scopes or need a refresher on setup and controls.
- Automotive oscilloscope guide
What a scope does, choosing probes, safe hookup, and the patterns that matter most.
- Triggers & timebase
Pick the right trigger mode and timebase so the event you care about lands on screen.
- Current clamps for engine diagnostics
Read starter, injector, and parasitic-draw currents without breaking any circuit.
Waveform patterns
Deep dives on the shapes that reveal misfires, weak coils, bad injectors, and dead cylinders.
- Ignition waveform diagnosis
Firing line, spark line, coil oscillations — decode secondary and COP patterns.
- Fuel injector waveforms
Voltage and current signatures for saturated and peak-and-hold injectors.
- Relative compression test
Find a dead cylinder in five minutes with a starter current capture.
- CAN bus diagnosis
Capture CAN-H and CAN-L, check termination, and spot bus-off and voltage faults.
- Known good waveforms
Use reference patterns (including PicoScope waveforms) to spot timing, amplitude, and integrity deviations.
- Automotive oscilloscope: how to read waveforms
What a lab scope does, how to hook it up, and the three-pass method for reading any automotive waveform.
Practical techniques
Field workflows for the hardest, most profitable faults.
Engine sound diagnostics
When the scope isn't out, your ears (and a phone recording) still catch a lot.
- Engine sound diagnostics overview
What noises to trust, how to record them cleanly, and how to feed them into the analyzer.
- Sound diagnostic checklist
Step-by-step checklist for recording clips and gathering data so the AI gives its best diagnosis.
- Knock vs bearing noise
Tell spark knock, rod knock, main rumble, piston slap, and wrist-pin tick apart.
- Belt & timing chain noise
Serpentine squeal, tensioner rattle, chain slap at cold start, VVT actuator tick.
Have a capture or a noise recording?
Upload a waveform screenshot or an engine-sound clip and WaveWrench Pro ranks the likely faults.