Lacks Power/Poor Performance/Excessive Black Smoke
SYMPTOM DESCRIPTION:Engine delivers less than expected power. Little or no increase in speed when accelerator is pushed down part way.
POSSIBLE CAUSE ACTION
Improper fuel ^ Drain fuel tank, flush system,
and fill with proper fuel. Change
fuel filter.
Empty fuel tank or ^ Fill tank.
fuel tank vent blocked ^ Bleed fuel system.
^ Check tank vent.
Control lever not going ^ Adjust throttle linkage.
to full throttle
Clogged fuel filter ^ Replace fuel filter.
Intercooler internally ^ Check pressure drop across
blocked or restricted inlet and outlet of intercooler.
If pressure drop exceeds 4 in. Hg,
clean or replace intercooler as
needed.
Restricted, blocked or damaged ^ Remove and clean or replace
fuel supply lines. fuel lines as needed.
Bleed fuel system.
Injection pump overflow fitting ^ Install fittings to their
switched with fuel inlet fitting proper locations.
Bleed fuel system.
Leaking, restricted, or damaged ^ Replace leaking or damaged
supply lines, or loose fuel lines or tighten connections as
connections needed. Bleed fuel system.
Incorrect injection pump to ^ Check and/or Adjust
engine timing injection pump timing.
Damaged or restricted injector ^ Clean or replace injector
nozzle nozzles.
Clogged or restricted air ^ Replace fuel filter.
filter
Air/fuel control tube broken ^ Repair or replace as
necessary.
Low manifold pressure ^ Check turbocharger system.
^ Check pressure drop across
inlet and outlet of intercooler.
If pressure drop exceeds 4 in. Hg,
clean or replace intercooler as
needed.
Fuel injection sequence ^ Check fuel injection lines
does not correspond with for proper routing.
firing order
Low or uneven engine ^ Repair as necessary.
compression
Restricted, blocked, or ^ Remove restriction or
leaking fuel injector lines replace lines as necessary.
Bleed fuel system.
Malfunctioning injection pump ^ If injection pump is malfunctioning
or will not adjust properly, replace as
a unit.