Chrysler RAM TRUCK 2500 1994 Service Manual page 732

+ ENGINES 9 - 11
SERVICE DIAGNOSIS (DIESEL ENGINE) - PERFORMANCE (CONT.)
C O N D I T I O N P O S S I B L E CAUSES € O B t f t E € T I O N
L O W P O W E R
(Cont'd)
Slow throttle response caused by
leaking or obstructed air fuel control
tube or improperly operating
control in the pump.
Check for leaks and obstructions. Tighten the fittings. Repair or replace
the pump if the controls are not functioning.
Inadequate intake air flow. Inspect/replace air cleaner element. Look for other restrictions.
High pressure fuel leak. Inspect/correct leaks in the high pressure lines, fittings injector sealing
washers or delivery valve seals.
Inadequate fuel supply. Air in
the fuel.
Check the flow through the filter to locate the source of the restriction.
Check fuel pressure and inlet restriction.
Excessive exhaust restriction. Check/correct the restriction in the exhaust system.
High fuel temperature. Verify that fuel heater is off during warm weather. Check for a restricted
fuel drain manifold. Repair/replace as needed.
Poor quality fuel or fuel
contaminated with gasoline.
Verify by operating from a temporary tank with good fuel. Check for
presence of gasoline. Replace fuel/water separator filter.
Air leak between the turbocharger
and the intake manifold.
Check/correct leaks in hoses, gaskets, charge air cooler and around
mounting cap screws or through holes in the manifold cover.
Exhaust leak at the manifold or
turbocharger.
Check/correct leaks in the manifold or turbocharger gaskets. If manifold
is cracked, replace manifold.
Improperly operating turbocharger.
Inspect/replace turbocharger.
Valve clearance incorrect.
Check/adjust valves.
Worn or improperly operating
injectors.
Check/replace injectors.
Incorrect injection pump timing. Verify injection pump timing (see Group 14, Fuel System).
Improperly operating injection pump.
Repair or replace injection pump.
EXCESSIVE EXHAUST
SMOKE
Engine running too cold (white
smoke).
Refer to troubleshooting logic for coolant temperature below normal
(refer to Group 7, Cooling System). Inspect intake manifold heater for
proper operation.
Improper starting procedure
(white smoke).
Use proper starting procedure.
Fuel supply inadequate. Check fuel supply pressure and inlet restriction.
Injection pump timing.
Check and time pump (refer to Group 14, Fuel System.
Inadequate intake air.
Inspect/change air cleaner. Look for other restriction. Check charge air
cooler for obstructions.
Air leak between turbocharger and
intake manifold.
Check/correct leaks in the air crossover tube, hoses, gaskets, mounting
capscrews or through holes in the manifold cover.
Exhaust leak at the manifold or
turbocharger.
Check/correct leaks in the manifold or turbocharger gaskets. If cracked
replace manifold.
Improperly operating turbocharger.
Inspect/replace turbocharger.
J9409-112