housing for signs of oil leakage.
Inspect the cooling system, overcooling can
sometimes cause blue smoke.
Check the "AIR INDUCTION SYSTEM."
GRAY SMOKE depending on the specific
level, can be caused by the injection nozzle
condition and/or air induction system. Gray
smoke will exceed specified levels:
If air cleaner restriction is high or
Remove and test nozzles.
BLACK SMOKE must be immediately
corrected. All areas of appropriate
"PROBLEM ANALYSIS GUIDE" (CGES-
390, 365, 335-2, or 355-3) must be
investigated to determine cause.
If problem cannot be resolved by analysis,
remove injection pump for a test stand
WHITE SMOKE - generally indicates
Excess fuel on starting with
Insufficient cranking speed or
These conditions result in misfiring with warm
In general, any excess smoke problem can be
resolved by following the procedures in the
EVALUATING NORMAL EXHAUST SMOKE (6.9 Liter
BLUE-WHITE SMOKE CAN BE OBSERVED
At engine start up at all engine temperatures and
at all ambient temperatures.
At low idle speeds after cold engine start up this
smoke will clear up soon after the vehicle is
After the engine warm up period due to extended
idling time (ten minutes or more).
DARKER SMOKE CAN BE OBSERVED
When pulling hard, such as going up a steep
Heavily loaded, such as pulling a trailer or
operating with a heavy load in the truck bed.
NOTE: Black smoke under the above
pronounced at higher altitudes.
instructions are available through IH
dealers in those areas, as well as
CGES-345 6.9L Fuel Injection Pump
OPERATE ENGINE ABOVE RATED
Operating above rated speed at no load high idle or light
load conditions will result in:
WHITE - BLUE/WHITE SMOKE.
GOVERNOR HUNTING - SURGE.
SPUTTERING OR MISFIRE.
These conditions occur because at W.O.T. the face cam
is in the full retard position and the min-max. governor is
cutting fuel delivery back to idle quantities, which causes:
SPEED VARIATION AND VERY RETARDED
. . . LOW POWER
Determine how power or performance is
Compare to identical units in same type
DATA GUIDELINES" in the rear of each
Determine cause of problem:
Check fuel type and grade. Refer to
Printed in United States of America