Improperacceleration:•Throttlevalvedoesnotfullyopen•Aircleanerelementclogged•Fuelcontaminatedwithwaterorforeignmatter•Brakedragging•Clutchslipping•Engineoverheating•Engineoilleveltoohigh•Engineoilviscositytoohigh•Crankshaftbearingwornordamaged•DrivechaintroubleKnocking:•Carbonbuiltupincombustionchamber•Fuelqualitypoorortypeincorrect•Sparkplugtypeincorrect•ECUdefectiveEngineoverheating-Firingincorrect:•Sparkplugdirty,broken,orgapimproperly•Sparkplugtypeincorrect•ECUdefectiveFuel/airmixtureincorrect:•Throttlebodyassyholderloose•Aircleanerelementclogged,poorlysealed,ornotinstalled•AircleanerductpoorlysealedCompressionhigh:•Carbonbuiltupincombustionchamberj188TROUBLESHOOTINGGUIDE•Sparkplugcaporhigh-tensionwiringdefective•Sparkplugcapshortedornotcontactingproperly•Sparkplugtypeincorrect•ECUdefective•Ignitioncoildefective•Crankshaftsensordefective•Alternatordefective•WiringconnectornotingoodcontactFuel/airmixtureincorrect:•Aircleanerelementclogged,poorlysealed,ornotinstalled•Fuelcontaminatedwithwaterorforeignmatter•Fueltankcapairventobstructed•Throttlebodyassyholderloose•Aircleanerductloose•Fuellineclogged•FuelpumpdefectiveCompressionlow:•Sparkplugloose•Cylinderheadboltinsufficientlytightened•Cylinderboltloose•Cylinderorpistonworn•Novalveclearance•Valvespringbrokenorweak•Valvenotseatingproperly(valvebent,worn,orcarbonaccumulationontheseatingsurface)•Pistonringworn,weak,broken,orsticking•Pistonring/grooveclearanceexcessive•Cylinderheadgasketdamaged•Cylinderheadwarped•Cylindergasketdamaged•Decompressiontrouble
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