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4l30e not locking when hot at cruizing speed

Works fine until the tranny reaches full temp then will unlock when cruizing speed is reached. Will lock when accelerating slightly but will unlock again when traveling on flat highway when maintaining speed.

Posted by Jeff cooper on


3 Related Answers


Steve Allison

  • 5569 Answers

SOURCE: 318ti M44 acceleration problem

Have someone handy to press the gas pedal for you after the engine has warmed up well; best if driven.

While you listen at the exhaust pipe, have your helper increase the revs slowly and note whether the exhaust note changes to a hiss, instead of the sound of an engine firing.

You may have a decayed catalytic convertor and when they come apart inside, they can clog mufflers and resonators (the second, smaller muffler).

I've had this happen on more than one car and when it happened on a Fiat Strada years ago, since the routing of the system was fairly straight and made of heavier gauge stainless steel, I fired two shots with a .357 magnum into the tailpipe.
Never had another problem with it.

Posted on Jul 20, 2008



  • 408 Answers

SOURCE: Faulty torque lock up in 4th gear

I would say either  transmission control module or the torque converter.

Posted on Mar 12, 2009



  • 1 Answer

SOURCE: My key will open my trunk, but not unlock my doors or start my car.

Open the trunk. Take out the trunk lid light - take the bulb out of the fixture. Place a 12 volt battery in the trunk. Take an alligator clip jumper wire - connect one end to the negative terminal of the battery and the other end of the jumper wire to the car chassis - make sure it is a good connection and is not on a painted surface - I place mine on a bolt on the rear light panel. Take another alligator clip jumper wire and connect one end to the 12 volt positive terminal and connect the other end to the short end of the light connectors (there are two connectors for the light - one is short and one is long). This should give you enough voltage to unlock the doors. I had to figure this out and have used it twice on my BMW.

Posted on Sep 10, 2009

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Coasting in neutral will cook a TC if done for very long. This is because the TC is spinning at a relatively higher engine speed but the tranny pump is not putting out enough fluid to keep it cool.

A locked TC is always better for the tranny and full power output. An unlocked TC is wasting energy churning up the fluid and causing a parasitic drag.

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