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IF SHUDDER OCCURS AFTER TCC HAS APPLIED If shudder occurs after the TCC has applied, most of the time there is nothing wrong with the The TCC is not likely to slip after the TCC has been applied. Engine problems may go unnoticed Once TCC is applied, there is no torque converter (fluid coupling) assistance. Engine or driveline Inspect the following components in order to avoid misdiagnosis of TCC shudder. An inspection Spark plugs-Inspect for cracks, high resistance or a broken insulator. Plug wires-Look in each end. If there is red dust (ozone) or a black substance (carbon) Coil-Look for a black discoloration on the bottom of the coil. This indicates arcing while Fuel injector-The filter may be plugged. Vacuum leak-The engine will not get a correct amount of fuel. The mixture may run rich or EGR valve-The valve may let in too much or too little unburnable exhaust gas and could MAP/MAF sensor-Like a vacuum leak, the engine will not get the correct amount of fuel for Carbon on the intake valves-Carbon restricts the proper flow of air/fuel mixture into the Flat cam-Valves do not open enough to let the proper fuel/air mixture into the cylinders. Oxygen sensor-This sensor may command the engine too rich or too lean for too long. Fuel pressure-This may be too low. Engine mounts-Vibration of the mounts can be multiplied by TCC engagement. Axle joints-Check for vibration. TP Sensor-The TCC apply and release depends on the TP Sensor in many engines. If the TP
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Sensor is out of specification, TCC may remain applied during initial engine loading. Cylinder balance-Bad piston rings or poorly sealing valves can cause low power in a Fuel contamination-This causes poor engine performance. Replace the torque converter if any of the following conditions exist: External leaks appear in the hub weld area. The converter hub is scored or damaged. The converter pilot is broken, damaged, or fits poorly into the crankshaft. You discover steel particles after flushing the cooler and the cooler lines. The pump is damaged, or you discover steel particles in the converter. The vehicle has TCC shudder and/or no TCC apply. Replace the torque converter only after The converter has an imbalance which cannot be corrected. Refer to Flexplate/Torque The converter is contaminated with engine coolant which contains antifreeze or water. An internal failure occurs in the stator roller clutch. You notice excessive end play. Overheating produces heavy debris in the clutch or converter ballooning. You discover steel particles or clutch lining material in the fluid filter or on the magnet, Do not replace the torque converter if you discover any of the following symptoms: The oil has an odor or the oil is discolored, even though metal or clutch facing particles are The threads in one or more of the converter bolt holds are damaged. Correct the condition Transmission failure did not display evidence of damaged or worn internal parts, steel The vehicle has been exposed to high mileage only. An exception may exist where the lining
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
FLEXPLATE/TORQUE CONVERTER VIBRATION TEST ISOLATING VIBRATION To isolate and correct a flywheel or torque converter vibration, separate the torque converter 1. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration. 2. Turn the engine OFF. 3. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle . 4. Remove the transmission converter cover bolts and the cover. 5. Mark the relationship of the converter to the flywheel. 6. Remove the bolts attaching the converter to the flywheel. 7. Slide the torque converter away from the flywheel. 8. Rotate the flywheel and torque converter to inspect for defects or missing balance weights. 9. Lower the vehicle. 10. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration. Refer to Diagnostic Starting Point - Vibration Diagnosis and Correction . 11. Turn the engine OFF. INDEXING TORQUE CONVERTER To determine and correct a torque converter vibration, the following procedure may have to be 1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle . 2. Rotate the torque converter one bolt position. NOTE: Some engine/transaxle combinations cannot be balanced in this
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 7: View Of Torque Converter Hub In Engine Crankshaft 3. Align the torque converter hub (2) in the engine crankshaft (3) and install the torque converter to flywheel bolts. 4. Lower the vehicle.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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