Engine Starts, Idles Rough Without Unusual Noise Or Smoke

ENGINE STARTS, IDLES ROUGH WITHOUT UNUSUAL NOISE OR SMOKE

Possible Cause	Correction
Incorrect slow idle adjustment.	Reset slow idle adjustment. See ADJUSTMENTS article.
Leaking injection line.	Check fittings and/or replace line.
Plugged fuel return line.	Remove restrictions.
Air in lines to nozzles.	Check line fittings.
Air in injection pump.	Check pump fittings and pump operation.
Faulty nozzle.	Replace nozzle. See I - SYS/COMP TESTS article.
Improper or contaminated fuel.	Remove and replace fuel.
Uneven fuel distribution.	Check fuel delivery system.