Chrysler 1998 Voyager Service Manual page 1223

NS/GS
DIAGNOSIS AND TESTING (Continued)
ENGINE DIAGNOSIS—MECHANICAL CONT.
CONDITION
LUBRICATING OIL LOSS
(CONT.)
COMPRESSION KNOCKS
EXCESSIVE ENGINE NOISES
POSSIBLE CAUSES
6. Turbocharger leaking oil into the
air intake.
7. Piston rings not sealing (oil being
consumed by the engine).
1. Air in fuel system.
2. Poor quality fuel or water/gasoline
contaminated fuel.
3. Engine Overloaded.
4. Improperly operating injectors.
5. Fuel injection system defective.
1. Drive belt squeal, insufficient
tension or abnormally high loading.
2. Intake air and exhaust leak.
3. Excessive valve lash.
4. Turbocharger noise.
5. Power function knock.
6. Fuel injection system defective.
ENGINE
CORRECTION
6. Inspect air duct for evidence of oil
transfer.
7. Perform blow-by check. Repair as
required.
1. Bleed the fuel system (refer to
Group 14, Fuel System).
2. Verify by operating from a
temporary tank with good fuel. Clean
and flush the fuel supply tank.
Replace fuel/water separator.
3. Verify the engine load rating is not
being exceeded.
4. Check and replace injectors.
5a. Instrumented injection. 5b. Timing
solenoid of the fuel pump. 5c. Pre
and post heat time of the glow plugs.
Check the fault codes in the ECU.
1. Inspect the drive belts. Make sure
water pump pulley, generator and
power steering all turn freely.
2. Refer to excessive exhaust smoke.
(Engine Diagnosis and Testing)
3. Make sure the rocker arms are not
bent. Defective hydraulic lash
adjuster.
4. Check turbocharger impeller and
turbine wheel for housing contact.
5. Check and replace rod and main
bearings.
6a. Instrumented injection. 6b. Timing
solenoid of the fuel pump. 6c. Pre
and post heat time of the glow plugs.
Check the fault codes in the ECU.
9 - 45