18
TroubleshootingGuide
GASOLINEVEHICLE-TROUBLESHOOTING
ANDELECTRICALSYSTEM
GASOLINEPOWERTRAIN
_
TROUBLESHOOTINGGUIDE
SYMPTOMPOSSIBLECAUSESCORRECTIVEACTION
Sparkplugispartiallyfouledorinpoor
condition
Cleanorreplace
SparkplugisdamagedorlooseReplaceortighten
IncorrectsparkpluggapAdjustgap
SparkplugwireisdamagedorlooseReplaceorreconnect
Looseorbadwireconnectionatignitioncoil,
EFIsensors,orECU
TestProcedures14–IgnitionSparkor15
–IgnitionCoilor4–EFISystem(ECUand
Sensors)
Intermittentignitioncoilfailure
TestProcedures14–IgnitionSparkand15
–IgnitionCoil
LowfuellevelinfueltankReîš¿ll
FuellinepinchedorcloggedCleanorreplace
PoorfuelqualityorcontaminatedfuelReplace
Fuelpumpmalfunction;fuelpressureto
throttlebodytoolow
Section21—GasolineVehicle-FuelSystem
Waterordirtinthefuelsystemand/orthrottle
body/fuelinjector;dirtyorcloggedfuelîš¿lter
Section21—GasolineVehicle-FuelSystem
Throttlebodydirtyorimproperlyadjusted
Cleanoradjust.Section21—Gasoline
Vehicle-FuelSystem
LowcylindercompressionSection20—GasolineVehicle-Engine
Cylinderheadboltsnottightenproperly
Checkandretighten.Section20—Gasoline
Vehicle-Engine
Intakeorexhaustvalvenotsealing
Repair.Section20—GasolineVehicle-
Engine
Incorrectvalveclearance
Adjust.Section20—GasolineVehicle-
Engine
VacuumleakRetightenhardwareorreplacegasket(s)
Enginedoesnotstarteasily.
Starter/generatorbeltisslipping
BeltTensionAdjustmentforEFIEngineson
page19-13
SparkplugisfouledorinpoorconditionSection20—GasolineVehicle-Engine
SparkplugwireisdamagedorlooseSection20—GasolineVehicle-Engine
Intermittentignitioncoilfailure
TestProcedures14–IgnitionSparkand15
–IgnitionCoil
Waterordirtinthefuelsystemand/orthrottle
body/fuelinjector;dirtyorcloggedfuelîš¿lter
Section21—GasolineVehicle-FuelSystem
Enginestartsbutdoesnotrunsmoothly.
Fuelpumpmalfunction;fuelpressureto
throttlebodytoolow
Section21—GasolineVehicle-FuelSystem
TABLECONTINUEDONNEXTPAGE
Page18-42019PrecedentVillager2MaintenanceandServiceManual
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