Fuel System Troubleshooting; Fuel Starvation / Lean Mixture; Rich Mixture; Poor Idle - Taylor-Dunn G0-010-00 Service And Replacement Parts Manual

FUEL SYSTEM TROUBLESHOOTING

FUEL STARVATION / LEAN MIXTURE

Symptoms: Hard start or no start, bog, backfire, popping
through intake / exhaust, hesitation, detonation, low
power, spark plug erosion, engine runs hot, surging, high
idle, idle speed erratic.
• No fuel in tank
• Restricted tank vent, or routed improperly
• Fuel lines or fuel injectors restricted
• Fuel pump inoperative
• Air leak in system
• Intake air leak (throttle shaft, intake boot, gasket or
grommet)
• Failed sensor or disconnected wiring

RICH MIXTURE

Symptoms: Fouls spark plugs, black, sooty exhaust
smoke, rough idle, poor fuel economy, engine runs
rough/ misses, poor performance, bog, engine loads up,
backfire.
• Air intake restricted (inspect intake duct)
• Air filter dirty/plugged
• Poor fuel quality (old fuel)
• Fouled spark plug
• Injector failure
• Failed sensor or disconnected wiring
9929758 R01 - 2019 TAYLOR-DUNN G-100 Service Manual
© Copyright TAYLOR-DUNN

POOR IDLE

Symptom: Idle Too High (If greater than 1300 RPM when
engine is warm)
• Failed sensor or disconnected wiring
• Intake air leak
Symptom: Idle Too Low (if less than 1200 RPM when
engine is warm)
• Dirty throttle body (damaged or improper air filter)
• Plugged air filter
• Leaking injector (rich condition)
• Belt dragging
• Failed sensor or disconnected wiring
Symptom: Erratic Idle
• Air Leaks, dirty injector
• Tight valves
• Belt dragging
• Dirty air cleaner
• Engine worn
• Spark Plug fouled
• Failed sensor or disconnected wiring
FUEL SYSTEM
4
4.47