WORKHORSE CUSTOM CHASSIS
Service Manual
W SeriesWCC
SECTION
6.2
PAGE
16
Engine Mechanical
W Series Chassis
TOC
© 2006 WorkhorseCustom Chassis — All Rights Reserved
Cause Correction
Abnormalities, such as severe cracking, bumps, or missing areas in the
accessory drive belt
Abnormalities in the accessory drive system and/or components may
cause engine RPM variations and lead to a misfi re diagnostic trouble code
(DTC). A misfi re code may be present without an actual misfi re condition.
Replace the drive belt. Refer to Drive Belt Replacement - Accessory
Worn, damaged, or mis-aligned accessory drive components or excessive
pulley runout
A misfi re code may be present without an actual misfi re condition.
1. Inspect the components.
2. Repair or replace the components, as required.
Loose or improperly installed engine fl ywheel or crankshaft balancer
A misfi re code may be present without an actual misfi re condition.
Repair or replace the fl ywheel and/or balancer, as required. Refer to
Engine Flywheel Replacement or Crankshaft Balancer Replacement.
Restricted exhaust system
A severe restriction in the exhaust fl ow can cause signifi cant loss of
engine performance and may set a DTC. Possible causes of restrictions
include collapsed or dented pipes or plugged muffl ers and/or catalytic
converters.
Repair or replace, as required.
Improperly installed or damaged vacuum hoses Repair or replace, as required.
Improper sealing between the intake manifold and cylinder heads or
throttle body
Replace the intake manifold, gaskets, cylinder heads, and/or throttle
body, as required.
Improperly installed or damaged manifold absolute pressure (MAP)
sensor
The sealing grommet of the MAP sensor should not be torn or damaged.
Repair or replace the MAP sensor, as required.
Worn or loose rocker arms Repair or replace the valve rocker arms, as required.
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General