Engine Runs Rough at Idle (Continued)
Cause Corrections
----------
Fuel Grade Incorrect or Fuel Quality Poor
OK
f
Verify by operating engine from a
temporary tank that contains good fuel.
----------
• STC Valve and/or External Plumbing
Restriction Excessive or Flow Loss (White
Smoke Present)
• STC Internal Plumbing Restriction Exces-
sive or Flow Loss (White Smoke Present)
OK
f
Inspect STC valve and/or plumbing for leaks
and restriction and proper operation. Refer to
Procedures 5-11. Check STC plumbing for
excessive restriction or flow loss. Refer to
Procedure 5-12.
----------
Engine Brake Adjustments Incorrect
OK
f
Check engine brake settings. Refer to
Procedure 7-05.
----------
Overhead Adjustments Incorrect or
Push Rod Damaged
OK
f
Check valve and injector settings. Refer
to Procedure 7-04.
----------
PT Fuel Pump Defective or Malfunctioning
OK
f
Remove PT fuel pump and check calibration
and check for leaks. Refer to PT Fuel Pump
Rebuild and Calibration Manual, Bulletin No.
3379084.
----------
STC Injector Tappet Top Link Incorrect
OK
f
Check injector parts listing for the
proper top link. Check injector for
correct top link.
----------
PT Injector Defective, Calibration Incorrect,
or Wrong Parts. For Example:
• STC Tappet Load Cell Check Ball Incorrect
• STC Tappet Malfunctioning
• STC Tappet and Adjusting Screw Parts
Incorrectly Matched
OK
f
Remove injectors. Check for proper load cell
check ball. Refer to Procedure 5-10.
- or-
Check injector parts listing for correct tappet
and injector adjusting screw.
-or-
Check calibration and cups for plugging.
Refer to STC Injector Shop Manual, Bulletin
No. 3810313.
(Continued)
SectionT-Troubleshooting Troubleshooting Symptoms Charts
N14 Page T-55
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