Chapter
C
: Fuel, Air Induction, and Exhaust Systems Diagnosis and Repair
54
HARD START COLD ENGINE
SECONDARY IGNITION SYSTEM
FUEL PRESSURE
THROTTLE POSITION SENSOR
MAP SENSOR
MINIMUM IDLE AIR FLOW
IDLE AIR CONTROL MOTOR
ENGINE MECHANICAL SYSTEMS
IAT SENSOR
START AND STALL/ FLOODING
SECONDARY IGNITION SYSTEM
ECM POWER AND GND CKT
FUEL PRESSURE
ECT SENSOR
THROTTLE POSITION SENSOR
MAP SENSOR
THE MINIMUM IDLE AIR FLOW
IDLE AIR CONTROL MOTOR
HESITATIO N/SAG/STUMBLE
SECONDARY IGNITION SYSTEM
ECM POWER AND GND CKT
ENGINE VACUUM
FUEL PRESSURE
ECT SENSOR
THROTTLE POSITION SENSOR
MAP SENSOR
OXYGEN SENSOR SWITCHING
O2S HEATER
IDLE AIR CONTROL MOTOR
ENGINE MECHANICAL SYSTEMS
EVAP EMISSION SYSTEM
EGR SYSTEM
IAT SENSOR
LACK OF POWER/SLUGGISH
SECONDARY IGNITION SYSTEM
ECM POWER AND GND CKT
FUEL PRESSURE
ECT SENSOR
THROTTLE POSITION SENSOR
MAP SENSOR
MINIMUM IDLE AIR FLOW
OXYGEN SENSOR SWITCHING
IDLE AIR CONTROL MOTOR
EGR SYSTEM
CUTS OUT/MISSES
SECONDARY IGNITION SYSTEM
ECM POWER AND GND CKT
FUEL PRESSURE
IDLE AIR CONTROL MOTOR
EGR SYSTEM
SURGE/RUNS ROUGH
UNSTABLE/ERRATIC IDLE
SECONDARY IGNITION
ECM POWER AND GND CKT
ENGINE
VACUUM
FUEL PRESSURE
COOLANT SENSOR
THROTTLE POSITION SENSOR
MAP SENSOR
MINIMUM IDLE AIR FLOW
OXYGEN SENSOR SWITCHING
O2S HEATER
IDLE AIR CONTROL MOTOR
ENGINE MECHANICAL SYSTEMS
EVAP EMISSION SYSTEM
EGR SYSTEM
IAT SENSOR
POOR FUEL ECONOMY
SECONDARY IGNITION SYSTEM
ECM POWER AND GND CKT
ENGING
VACUUM
FUEL PRESSURE
ECT SENSOR
THROTTLE POSITION SENSOR
MAP SENSOR
OXYGEN SENSOR SWITCHING
O2S HEATER
ENGINE MECHANICAL SYSTEMS
EVAP EMISSION SYSTEM
EGR SYSTEM
IAT SENSOR
HARD START HOT ENGINE
SECONDARY IGNITION SYSTEM
ENGINE VACUUM
FUEL PRESSURE
THROTTLE P OSITION SENSOR
MAP SENSOR
MINIMUM IDLE AIR FLOW
IDLE AIR CONTROL MOTOR
ENGINE MECHANICAL SYSTEMS
EVAP EMISSION SYSTEM
EGR SYSTEM
ECT SENSOR
EMISSION SYSTEM CONCERNS
SECONDARY IGNITION
ENGINE VACUUM
FUEL PRESSURE
THROTTLE POSITION SENSOR
MAP SENSOR
ENGINE MECHANICAL SYSTEMS
EVAP EMISSION SYSTEM
EGR SYSTEM
ECT SENSOR
INCORRECT IGNITION TIMING
OXYGEN SENSOR(S)
CATALYTIC CONVERTER(S)
FUEL INJECTOR(S)
FUEL INJECTOR(S)
FUEL INJECTOR(S)
Fig. 3-1.
Typical diagnostic table.
Fuel Line Replacement
Fuel lines and vapor return lines may be formed of rigid
steel tubing, flexible nylon tubing, or neoprene hose.
Most lines fasten to the frame of the car with insulated
clamps and screws. Replace any damaged insulators
and clamps. Rigid lines can be replaced either as pre-
formed units, or be cut and formed to fit the vehicle from
bulk stock. Use steel tubing only. Never use copper tub-
ing in place of steel tubing. Hoses must be marked for
fuel system use or they rapidly deteriorate when used
for gasoline. Do not substitute rubber hoses on vehicles
that use nylon fuel tubing. An assortment of fittings are
used to join fuel lines:
• Flare type
• Compression type
• Push-connect type
• Spring-lock type, figure 3-2
Summary of Contents for ASE-A8
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