Navistar N9 User Manual

1DIAGNOSTICTROUBLESHOOTINGPROCEDURES37
Step3Recordsnapshotofenginerunningdataanddetermineifenginehasamisre.Decision
PerformRecordSnapshotofEngineRunningData(page2231)while
symptomisoccurring.
Doesenginespeedvaryby50rpmormorewhilesymptomisoccurring?
Yes:Goto5.2Misre
(Stumble/Surge/Runs
Rough)(page80).
No:GotoStep4.
Step4Determineifenginehaslowpowerorslowacceleration.Decision
Reviewenginerunningsnapshot.
Doesvehiclehavelowpowerorslowacceleration?
Yes:Goto5.1LowPower
(SlowAcceleration)(page
74).
No,ifequippedwithPower
Takeoff(PTO):GotoStep5.
NOTE:No,ifnotequipped
withPTO:reviewoperator
complaint.
Step5DetermineifengineisabletoreachdesiredspeedduringPTOoperation.Decision
A.Startengine.
B.OperatePTO.
C.IfvehicleisequippedwithamanualPTO,increaseenginerpmto
desiredoperatingspeed.
DoesenginereachdesiredspeedduringPTOoperation?
Yes:Reviewoperator
complaint.
No:Goto5.3EngineUnable
toReachDesiredSpeed
DuringPTOOperation(page
84).

Navistar N9 Specifications

General

Brand	Navistar
Model	N9
Category	Engine
Language	English