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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