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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

'90 Chevy Lumina, Transmission Just loses It

Q: My daughter owns a ‘90 Chevy Lumina. The car was missing during acceleration from 20 to 45 MPH then it would kick in fine. I was going to start replacing things like fuel filter and throttle positioning sensor when I had the chance. Today however, she came in and said she heard a noise during acceleration. I took out and when automatically shifting through the gears the transmission just loses it. Is the transmission gone or could it luckily be something else? I know old cars without computers but hope there is something electric that can affect slippage.

A: Your vehicle may be computerized but the transmission in your vehicle is not that computerized. The transmission reports to the computer what gear the transmission is in. The computer controls the operation of the lock-up torque converter but other than that the shifting is controlled internal of the transmission. From your description I’d say that you have problems inside the transmission and a new fuel filter or computer part will not be the fix. Sounds as if you’ll be visiting a transmission specialist.

 
     
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