Automatic Seems To Shift Itself--What Is It Doing?

  • Thread starter Thread starter Robert Cohen
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Robert Cohen

Maybe it's chip/computer is acclimating/adjusting itself to a different
driver's style of driving?

I'll be driving steadily our automatic on a highway trip, and it
occasionally seems to shift itself.

Is such normal? It doesn't worry me with extended service contract.

Approx 50,000 mileage, 2003 Elantra.
 
Robert said:
Maybe it's chip/computer is acclimating/adjusting itself to a different
driver's style of driving?

I'll be driving steadily our automatic on a highway trip, and it
occasionally seems to shift itself.

Is such normal? It doesn't worry me with extended service contract.
Click to expand...

Yes, that is why they call them "automatic", they shift themselves.


Matt
 
Maybe it's chip/computer is acclimating/adjusting itself to a different
driver's style of driving?

I'll be driving steadily our automatic on a highway trip, and it
occasionally seems to shift itself.

Is such normal? It doesn't worry me with extended service contract.

Approx 50,000 mileage, 2003 Elantra.
Click to expand...

Sounds like the Torque Convertor locking up. Many people refer to this
as the overdrive. You should also feel it when you give it more gas or
go up a sight hill. The RPM's will jump about 500. If you didn't have
the transmission flushed at 30k it would be wise to do this ASAP. Some
people say the trans shifting will get more noticable as the fluid
gets old. And make sure you only have it changed at the Hyundai dealer
and make sure they are using the SP III fluid only.
 
1:

"Sounds like the Torque Convertor locking up. Many people refer to this

as the overdrive. You should also feel it when you give it more gas or
go up a sight hill. The RPM's will jump about 500. If you didn't have
the transmission flushed at 30k it would be wise to do this ASAP. Some
people say the trans shifting will get more noticable as the fluid
gets old. And make sure you only have it changed at the Hyundai dealer
and make sure they are using the SP III fluid only."

Reply:

I'm recall manual overdrives in some 1950s vehicles.

We've been doing whatever the Elantra owners manual requires

re: specifically, change/flush of the transmission fluid

I think it was done, and
will now follow-up with specific inquiry at dealer which would be in
their computer records too.

THANKS
 
Sounds like the Torque Convertor locking up. Many people refer to this
as the overdrive. You should also feel it when you give it more gas or
go up a sight hill. The RPM's will jump about 500. If you didn't have
the transmission flushed at 30k it would be wise to do this ASAP. Some
people say the trans shifting will get more noticable as the fluid
gets old. And make sure you only have it changed at the Hyundai dealer
and make sure they are using the SP III fluid only.
Click to expand...

Unfortunately, going to the Hyundai dealer means nothing as far as them
using the proper fluid. The dealer I bought my Sonata from does not use SP
III. They use some BG magic synthetic fits-all.
 
Gotta say, if I'd gotten here first, I'd have been tempted to post
something similar. There's no way from the information given in the post
to get any idea of what the car is actually doing and under what
conditions. Reminds me of the time a customer brought in her Hyundai
Scoupe with the complaint "tach goes up and down while driving." Near as
we were able to figure, the customer thought it should remain steady like
the speedometer.
 
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