Intermitent overdrive problem - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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.

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Old 10-23-2004, 09:47 PM   #1
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Default Intermitent overdrive problem

The transmission in my 94 SE functions properly most of the time, but sometimes when I`ve run about thirty miles or so and jump on the highway it won`t shift into OD. All I have to do to make it work properly is to shut the engine off and restart it and everything is fine again. No codes. Any ideas? Computer?
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Old 10-23-2004, 11:10 PM   #2
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If the Torque Converter slips and takes too much time to engage, it'll time out and disengage. The ignition cycle fix is typical for this problem. You may want to consider changing or flushing your trans fluid. How does the fluid on the dipstick look? Make sure you check it AFTER driving for at least 10 minutes, to stir up all the particles. After settling overnight, nasty fluid can look good after all the friction material settles to the bottom of the pan.

In addition to nasty fluid (and it doesn't really have to be that bad-looking, if the properties of the fluid itself are degrading over time), it can also be caused by corrosion on the trans connector, or even a slow/sticking TC solonoid.
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