Guided diagnosis

What's the problem?

Pick your equipment, then the symptom. We'll ask a few discriminating questions, rank the causes against our verified guides, and give you interactive diagrams plus step-by-step repairs.

13 symptoms

Browse the full guide library Oil Tribology Reference

AI Mechanic

Edit with

What's the problem?

Engine Won't Start

Runs Rough / Surging

Loss of Power

Engine Overheating

Excessive Smoke

Oil Leaks

Excessive Vibration

Fuel Leaking

Backfiring / Afterfire

Hard Starting When Hot

Knocking / Ticking Noise

Dies While Running

Electric Start Won't Crank