Generac 004373-2 Engine Engine

• The engine will not crank.
  Cause: 1. Fuse blown 2. Loose, corroded or defective battery cables 3. Defective starter contactor 4. Defective starter motor 5. Dead Battery
  Fix: 1. Replace fuse. 2. Tighten, clean or replace battery cables as necessary. 3. Replace defective starter contactor. 4. Replace defective starter motor. 5. Charge or replace battery.
• The engine starts, but then shuts down.
  Cause: 1. Engine oil level low 2. Defective low oil pressure switch 3. Defective high temperature switch 4. Defective control board 5. Low coolant
  Fix: 1. Check oil and add oil as needed. 2. * 3. * 4. * 5. *
• The engine starts hard and runs rough.
  Cause: 1. Air cleaner plugged or damaged 2. Defective spark plug(s) 3. Dirty/Blocked air filter
  Fix: 1. Check, clean or replace air cleaner. 2. Clean, re-gap or replace plug(s). 3. Clean or replace as required.
• The engine cranks but will not start.
  Cause: 1. Out of fuel 2. Defective fuel solenoid (FS) 3. Open #14 wire from engine control board 4. Defective spark plug(s) 5. Dirty/Blocked air filter
  Fix: 1. Replenish fuel. 2. * 3. * 4. Clean, re-gap or replace plug(s). 5. Clean or replace as required.

Compiled from service & troubleshooting documentation across every generator set that uses the Generac 004373-2.