Dynojet 248x: Installation Guide - Manual (Page 54)

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Engine Warm Up
Warm the vehicle’s engine and drivetrain before beginning
testing. Consistent engine temperatures will assure your runs are
repeatable.
After Engine Warm Up
Always leave the vehicle in neutral (automatic transmission) or in
first gear (manual transmission), with the engine off, and make
sure the park brake and the dyno brake are on when you get off
the vehicle on the dyno.
• Fix any fuel, oil, or coolant leaks that may have shown up after
engine warm up and check the carburetor for leaks.
• Any loud or unusual engine noises or excessive exhaust smoke
should be resolved before continuing.