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Home of automotive instructor Paul Danner's diagnostic training: free case-study videos plus a paid library of classroom lectures and his engine performance textbook. Teaches a systematic, wiring-diagram-driven approach to electrical and drivability faults using scan tools, meters, and oscilloscopes.
More resources on Engine Diagnostics
Automotive Engines: Diagnosis, Repair, and Rebuilding
Automotive technology textbook covering engine theory, diagnosis of mechanical problems, disassembly, measurement, machining, and reassembly. Readers come away able to trace noises, compression loss, and oil consumption to their causes and carry out a complete engine rebuild.
repairpal.com
RepairPal is a car maintenance and repair resource offering maintenance schedules, how-to guides for common issues, and transparent cost estimates, plus access to a network of certified repair shops.