1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Shuddering/Struggling engine/tranny HELP!!!

Old 04-22-2003, 08:23 AM
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The purpose of the Transmission Converter Clutch (TCC) feature is to eliminate the power loss of the torque converter stage when the vehicle is in a cruise mode. The TCC system uses a solenoid operated valve to engage the TCC which couples the engine flywheel to the input shaft of the transmission through the torque converter. This reduces the slippage losses in the converter, which increases fuel economy. Another solenoid (pulse width modulator or PWM solenoid) is used to regulate fluid pressure to the TCC to "cushion" the apply of the clutch.

For the converter clutch to apply, at least two conditions must be met.
1.Internal transmission fluid pressure must be correct.
2.The PCM completes a ground circuit to energize the TCC solenoid in the transmission, which moves a check ball in the fluid line.

The PCM controls the TCC apply solenoid by looking at several sensors.
1.Engine must be in closed loop operation.
2.Vehicle Speed Sensor (VSS). Speed must be above a certain value before the clutch can apply.
3.Coolant Temperature Sensor (CTS). Engine must be warmed up before the clutch can apply.
4.The 4th gear switch is used as a input to the PCM. The PCM uses the switch signal for TCC engage and disengage points.
5.Throttle Position Sensor (TPS). After the converter clutch applies, the PCM uses the information ftom the TPS to release the clutch when the car is accelerating or decelerating at a certain rate.
6.Another switch used in the TCC circuit is a brake switch which opens the 12 volt supply to the TCC solenoid when the brake is depressed.
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Old 04-22-2003, 08:26 AM
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I'm more inclined to think that some of the internal parts are slipping or shot.
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