Dodge ram truck 3500 1996 Service Manual page 1008

9 - 1 8 ENGINE . ~ B R
D I A G N O S I S A N D T E S T I N G (Continued)
S E R V I C E DIAGNOSIS—DIESEL—PERFORMANCE—CONT.
CONDITION POSSIBLE CAUSES CORRECTION
LOW POWER CONT.
8. High fuel temperature.
8. Verify that fuel heater is off when engine
is warm. Check for restricted fuel drain
tube. Repair/replace as needed.
9.
Poor quality fuel or fuel
contaminated with gasoline.
9.
Verify by operating from a temporary
tank with good fuel. Check for presence
of gasoline. Replace fuel/water
separator filter.
10.
Air leak between the
turbocharger and the intake
manifold.
10.
Check/correct leaks in hoses, gaskets,
charge air cooler and around mounting
capscrews or through holes in the
manifold cover.
11. Exhaust leak at the manifold or
turbocharger.
11. Check/correct leaks in the manifold or
turbocharger gaskets. If manifold is
cracked, replace manifold.
12.
Improperly operating
turbocharger.
12.
Inspect/replace turbocharger.
13.
Wastegate operation.
13.
Check waste gate operation.
14.
Valve not operating.
14.
Check for bent push rod, replace if
necessary.
15.
Worn or improperly operating
injectors.
15.
Check/replace injectors.
16. Incorrect injection pump timing.
16.
Verify injection pump timing (see Group
14, Fuel System).
17.
Improperly operating injection
pump.
17.
Repair or replace injection pump.
E X C E S S I V E EXHAUST 1 Engine running too cold (white 1. Refer to troubleshooting for coolant
SMOKE smoke). temperature below normal (refer to
Group 7, Cooling System). Inspect
intake manifold heater system for
proper operation.
2
Improper starting procedure 2. Use proper starting procedures.
(white smoke).
3
Fuel supply inadequate.
3.
Check fuel supply pressure and inlet
restriction.
4 Injection pump timing.
4 Check and time pump (refer to Group
14, Fuel System).
5
Inadequate intake air.
• 5 Inspect/change air filter. Look for other
restriction. Check charge air cooler for
obstructions.
6
Air leak between turbocharger
and intake manifold.
6
Check/correct leaks in the air crossover
tube, hoses, gaskets, mounting
capscrews or through holes in the
manifold cover.
7 Exhaust leak at the manifold or
turbocharger.
7
Check/correct leaks in the manifold or
turbocharger gaskets. If cracked,
replace manifold.
8 . Improperly operating
turbocharger.
8 Inspect/replace turbocharger.
9
. Improperly operating injectors.
9
Check and replace inoperative injectors.
J9509-149