Question about 1995 Chevrolet Lumina

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How can you tell if your computer is going out

Transmission acting up like the torque converter is trying to lock up sitting idling once engine is warm. Makes occasional thumping noise also When stopping when it shifts into 1st it is like it tries to lock. Changed fluid & filter & tcc solenoid. Did pin to pin on wiring harness, Ohm checked other solenoids.

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  • Ronald Walden
    Ronald Walden Oct 29, 2012

    Computer gives no trouble codes

  • Ronald Walden
    Ronald Walden Oct 29, 2012

    Also no check engine light

  • Ronald Walden
    Ronald Walden Oct 30, 2012

    Also found no metal pteces in pan when fluid was changed. Wonder if it may be torque converter?

  • Ronald Walden
    Ronald Walden Nov 04, 2012

    With wheels off ground eng idling goes n all gears but wheels turn in neutral

  • Ronald Walden
    Ronald Walden Jan 29, 2013

    Replaced torque converter. works fine

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  • 13 Answers

Thats sounds alot like your torque converter

Posted on Oct 30, 2012

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I have 2006 buick lacrosse they told me the auto transmission lock up and cause the motor to lock up .Is there such case


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If the transmission has a major failure ( total lock up) then the engine will still turn because of the torque converter
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1998 jeep grand cherokee 4x4. have the p0740 code. have to start from neutral, then shifts faily well. May start fluttering and making noise, have to put back to N, then to D and once again will shift. ...


P0740 JEEP - Torque Converter Clutch Circuit
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
- Vehicle may not shift into the highest gear

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
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When is the code detected?
Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.

P0740 JEEP Description
The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

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Hi!

It seems to be clutch problem.

There is a way to slightly adjust the idle,on the front of the throttle body where the intake boot is bolted on,abovt the boot and slightly to the left you will see a hole about 1/2 inch wide and it is plugged with grey epoxy like material. Using a flat head screw driver scrape the epoxy out of the hole and there is a flathead adjustment screw. You can adjust the idle up and down just a few hundred rpm. Hope this helps and let me know if there is any more direction you need.
Please rate this solution.

Thanks
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At 40-45 MPH it feels like the Torque converter is trying to lockup and really can't tell if it does or not . Feels like a surge forward, does it once and then OK for a while Car has been sitting for two...


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