Engine Exhibits Hard Start Symptoms - Briggs & Stratton VANGUARD M490000 Repair Manual

Definition: Engine cranks OK, but does not start for a long time. Engine does run, or may start but immediately die.
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.
4
• Fuel tanks
• 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 Check battery as follows:
• Look for loose or corroded terminals.
• Verify battery voltage is 12.2-13.5 volts.
Is a problem found?
6 Check for intermittent opens or shorts to ground in MAP sensor
circuit.
Is a problem found?
7 Check for proper TPS operation, if equipped.
Verify that throttle linkage is not sticking, binding or worn causing
high TPS voltage.
Is a problem found?
8 Check for proper IAC operation, if equipped.
Is a problem found?
98

ENGINE EXHIBITS HARD START SYMPTOMS

Action Yes
Go to applicable DTC Table.
Repair
Repair
Repair
Repair
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.
Continued...