1A
Engine Symptom Diagnosis
Perform troubleshooting referring to the followings when ECM has detected no DTC and no abnormality has been found in Visual Inspection:M13A without VVT and Engine Basic Inspection:M13A without VVT .
Condition Possible Cause Action
Hard starting (Engine cranks OK)
Faulty ignition coil
Faulty CMP sensing rotor or CKP sensing rotor
Faulty idle air control system
Faulty ECT sensor, TP sensor, CKP sensor, CMP sensor or MAP sensor
Fuel pressure out of specification
Faulty fuel injector
Faulty ECM
Malfunctioning PCV system
Low compression
Improper valve lash
Improper valve timing
Compression leak from valve seat
Sticky valve stem
Weak or damaged valve springs
Compression leak at cylinder head gasket
Sticking or damaged piston ring
Worn piston, ring or cylinder
Engine has no power
Engine overheating
Condition “Engine overheating”
Faulty ignition coil
Faulty knock sensor
Fuel pressure out of specification
Faulty injector
Faulty TP sensor, ECT sensor or MAP sensor
Faulty ECM
Malfunctioning EGR valve (if equipped)
Maladjusted accelerator cable play
Low compression
Dragging brakes
Condition “Dragging brakes” in Brakes Symptom Diagnosis
Slipping clutch
Condition “Slipping clutch” in Clutch System Symptom Diagnosis:M13A Model
Improper engine idling or engine fails to idle
Faulty ignition coil
Engine overheating
Condition “Engine overheating”
Fuel pressure out of specification
Faulty idle air control system
Faulty evaporative emission control system
Faulty injector
Faulty ECT sensor, TP sensor or MAP sensor
Malfunctioning PCV system
Faulty ECM
Faulty EGR system (if equipped)
Low compression
Engine hesitates (Momentary lack of response as the accelerator is depressed. Can occur at all vehicle speeds. Usually most severe when first trying to make the vehicle move, as from a stop sign.)
Faulty ignition coil
Engine overheating
Condition “Engine overheating”
Fuel pressure out of specification
Faulty injector
Faulty TP sensor, ECT sensor or MAP sensor
Faulty ECM
Malfunctioning EGR valve (if equipped)
Low compression
Surges (Engine power variation under steady throttle or cruise. Feels like the vehicle speeds up and down with no change in the accelerator pedal.)
Faulty ignition coil or high-tension cord
Variable fuel pressure
Faulty MAP sensor
Faulty injector
Faulty ECM
Malfunctioning EGR valve (if equipped)
Excessive detonation (The engine makes sharp metallic knocks that change with throttle opening. Sounds like pop corn popping.)
Engine overheating
Condition “Engine overheating”
Faulty spark plug
Clogged fuel filter and fuel lines
Malfunctioning EGR valve (if equipped)
Poor performance of knock sensor, ECT sensor or MAP sensor
Faulty injector
Faulty ECM
Excessive combustion chamber deposits
Overheating
Inoperative thermostat
Faulty A/C condenser fan motor or its circuit
Faulty radiator cooling fan clutch
Loose or slip water pump belt
Poor water pump performance
Clogged or leaky radiator
Improper engine oil grade
Clogged oil filter or oil strainer
Poor oil pump performance
Dragging brakes
Condition “Dragging brakes” in Brakes Symptom Diagnosis
Slipping clutch
Condition “Slipping clutch” in Clutch System Symptom Diagnosis:M13A Model
Blown cylinder head gasket
Poor gasoline mileage
Faulty ignition coil
Fuel pressure out of specification
Faulty TP sensor, ECT sensor or MAP sensor
Faulty injector
Faulty ECM
Malfunctioning EGR valve (if equipped)
High idle speed
Condition “Improper engine idling or engine fails to idle”
Low compression
Poor valve seating
Dragging brakes
Condition “Dragging brakes” in Brakes Symptom Diagnosis
Slipping clutch
Condition “Slipping clutch” in Clutch System Symptom Diagnosis:M13A Model
Thermostat out of order
Improper tire pressure
Excessive engine oil consumption
Sticky piston ring
Worn piston and cylinder
Worn piston ring groove and ring
Improper location of piston ring gap
Worn or damaged valve stem seal
Worn valve stem
Low oil pressure
Improper oil viscosity
Malfunctioning oil pressure switch
Clogged oil strainer
Functional deterioration of oil pump
Worn oil pump relief valve
Excessive clearance in various sliding parts
Engine noise
NOTE:
Before checking the mechanical noise, make sure that:
Ignition timing is properly adjusted.
Specified spark plug is used.
Specified fuel is used.
Improper valve lash
Worn valve stem and guide
Weak or broken valve spring
Warped or bent valve
Loose camshaft housing bolts
Worn piston, ring and cylinder bore
Worn crank pin bearing
Worn crank pin
Loose connecting rod nuts
Low oil pressure
Condition “Low Oil Pressure”
Worn crankshaft journal bearing
Worn crankshaft journal
Loose lower crankcase (bearing cap) bolts
Excessive crankshaft thrust play
Excessive hydrocarbon (HC) emission or Excessive carbon monoxide (CO) emission
Faulty ignition coil
Fuel pressure out of specification
Lead contamination of three way catalytic converter
Check for absence of filler neck restrictor.
Malfunctioning PCV system
Faulty EVAP control system
Closed loop system (A/F feed back compensation) fails
– Faulty TP sensor
– Faulty ECT sensor or MAP sensor
– Faulty oxygen sensor
Faulty injector
Faulty ECM
Low compression
Excessive nitrogen oxides (NOx) emission
Fuel pressure out of specification
Lead contamination of three way catalytic converter
Check for absence of filler neck restrictor
Closed loop system (A/F feed back compensation) fails
– Faulty TP sensor
– Faulty ECT sensor or MAP sensor
– Faulty oxygen sensor
Faulty injector
Faulty ECM
Faulty EGR system (if equipped)