Blueprint DiagnosticsOpen appEVIDENCE-FIRST AUTOMOTIVE HELP
Common problems, organized into useful tests
Each guide explains what the symptom or code does—and does not—prove, then puts the safest inspections and measurements in order.P0300 Random Misfire
Separate ignition, fuel, air, mechanical, and data causes.
Open guide →GUIDEP0171 System Too Lean
Use fuel-trim patterns to test air, delivery, exhaust, and sensor causes.
Open guide →GUIDECar Cranks but Won't Start
Prove cranking voltage, RPM, spark, injector command, fuel, and compression.
Open guide →GUIDECar Overheating
Separate leaks, airflow, circulation, pressure, and combustion gas.
Open guide →GUIDETransmission Slipping
Capture command, ratio, pressure, temperature, fluid, and mechanical evidence.
Open guide →