Engine or transmission INSPECT the powertrain/ drivetrain for grounded to chassis correct clearances. REPAIR as
necessary. TEST the system for normal operation after the repair.
Engine vibration - Engine out-of-balance CARRY OUT the NERU Test. increases intensity as the REFER to: Noise, Vibration and engine rpm is increased Harshness (NVH) (100-04 Noise,
Vibration and Harshness, Diagnosis and Testing). ROTATE the torque converter, 120 degrees for 3- bolt or 180 degrees for 4- bolt. INSPECT the torque converter pilot outer diameter-to-crankshaft pilot inner diameter. REPAIR as necessary. Refer to the appropriate section in Group 307 for the procedure. TEST the system for normal operation after the repair.
Engine vibration - mostly Combustion instability CHECK the ignition system. INSTALL at coast/neutral coast. new components as necessary. Refer to Condition improves with the appropriate section in Group 303 for vehicle acceleration the procedure. TEST the system for
normal operation after the repair.
Engine vibration or Worn or damaged INSPECT the spark plugs for cracks, high shudder - occurs with light spark plugs resistance or broken insulators. INSTALL to medium acceleration a new spark plug(s) as necessary. Refer above 56 km/h (35 mph) to the appropriate section in Group 303
for the procedure. TEST the system for normal operation after the repair.
Plugged fuel injector REPAIR or INSTALL a new injector as
necessary. Refer to the appropriate section in Group 303 for the procedure. TEST the system for normal operation after the repair.
Contaminated fuel INSPECT the fuel for contamination.
DRAIN the fuel system and refill. TEST the system for normal operation after the repair.
Component Tests
The following component tests are used to diagnose engine concerns.
Engine Oil Leaks
NOTE: If an overnight drive is done, the fan air or road air blast can cause erroneous readings.
NOTE: When diagnosing engine oil leaks, the source and location of the leak must be positively identified prior to repair.
Prior to carrying out this procedure, clean the cylinder block, cylinder heads, valve covers, oil pan and
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