Question about Pontiac LeMans

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Does a 1980 Pontiac Grand Lemans have a computer ? Have problem of TCC locking too early, almost right after 3rd engage, approx 32 MPH. 3.8L w/200c. Thinking possible vacuum switch. Dont know location. Thanks

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  • pshimek Jul 17, 2008

    So on a 1980 Pontiac, what determins TCC lockup ? I dont remember a pressure switch on the control valve. So I am guessing there is the brake switch to disengage TCC lockup, and possibly a vacuum switch for engaging. If there is a vacuum switch, where would it be located, and in what circuit.



    Thanks for your help !

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1 Answer

No Not at all,the computer was invented during the 1990's.
So There will be no problem of the TCC'S & The Enguage Of The Vacum Switch..

Posted on Jul 17, 2008

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Error codes


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Code P1740-Torque converter clutch did not lock up when the PCM sent the command. Enabling conditions: No engine or transmissions codes are present, vehicle speed was under 70 MPH, TPS was under 33% open. When the PCM commanded the torque converter to lock, no change was detected in engine speed. Blocking action: This code can block the following monitors: none.
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P1740 TCC O/D SOL PERFORMANCE (GAS)
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