Engine Power Output Low - Briggs & Stratton VANGUARD M490000 Repair Manual

Step
1 Perform OBD System Check.
Are any DTCs found?
2 Perform a careful visual check.
Is a problem found?
3 Check the following fuel system components for dirt, water, or
other contaminants.
• Fuel tanks
4
• Fuel filter
• Fuel lines
• Fuel pumps
Is a problem found?
4 Verify that fuel pressure is 38-43 psi (262-296 kPa). See CHECK/
RELIEVE FUEL SYSTEM PRESSURE in SECTION 5 -
REMOVAL/INSTALLATION.
Is a problem found?
5 Verify crankcase oil is at the correct level.
Is a problem found?
6 Verify air filter element is clean and dry.
Is a problem found?
7 Verify engine is not supporting a greater load than intended for its
application? Check for the following:
• Damaged drive belt.
• For mowers, verify blades are not restricted by debris.
• Faulty pulley bearing(s).
Is a problem found?
8 Verify spark plugs are:
• Gapped properly.
• Not gas fouled.
• Not excessively worn.
Is a problem found?
9 Verify exhaust is not restricted.
Is a problem found?
100

ENGINE POWER OUTPUT LOW

Action Yes
Go to applicable DTC Table.
Repair
Repair
Repair
Add crankcase oil.
Replace air filter element.
Repair
Repair
Repair
No
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Go to step 8.
Go to step 9.
Go to step 10.
Continued...