Generac Power Systems MAC 950F Owner's Manual page 22

Troubleshooting
Problem
Engine Misfiring or Runs
Irregularly
Lack of Engine Power
Engine Idles Poorly
18
Cause
Poor fuel quality Incorrect fuel/dirty fuel
Restricted fuel filter
Water, dirt, or air in fuel system
Low coolant temperature
Dirty or faulty fuel injectors
Electronic fuel system problem
Electronic Control System problem or
basic engine problem
Intake air restriction
Exhaust restricted
Poor fuel quality
Restricted fuel filter
Engine overloaded
Improper crankcase oil
Low coolant temperature
Improper valve clearance
Dirty or faulty fuel injectors
Turbocharger not functioning properly
Air leak in engine intake or exhaust mani-
fold
Engine is in derate due to DTC
Electronic Control System problem or
basic engine problem
Poor fuel quality
Electronic control system problem or basic
engine problem
Solution
Test fuel, drain water from fuel
bowl
Replace fuel filter element
Drain, flush, fill, and bleed fuel sys-
tem
Remove and check thermostat
Contact an IASD
Service air cleaner
Check and correct exhaust restric-
tion
Drain fuel and replace with proper
grade and quality of fuel for operat-
ing condition
Replace fuel filter elements
Reduce engine load
Drain crankcase oil and replace
with correct viscosity oil
Remove and check thermostat
Adjust valve clearance or contact
an IASD
Contact an IASD
Check intake and exhaust manifold
gaskets and manifolds; repair as
required or contact an IASD
Contact an IASD
Drain fuel and replace with proper
grade and quality of fuel for operat-
ing condition
Contact an IASD
Owner's Manual for Flameless Air Heater