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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / March 2007

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transmission problems with a hyndai

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wilderbillyof43@yahoo.com - 13 Mar 2007 23:02 GMT
I have a1996 hyndai elantra that will up shift fine but will not down
shift upon coming to a stop.  i have installed a new pulse generator
to the tranny with no results. no check eng. light comes on. you can
stop and restart eng. and trans. will start off normally
Comboverfish - 14 Mar 2007 21:03 GMT
On Mar 13, 5:02 pm, wilderbillyo...@yahoo.com wrote:
> I have a1996 hyndai elantra that will up shift fine but will not down
> shift upon coming to a stop.  i have installed a new pulse generator
> to the tranny with no results. no check eng. light comes on. you can
> stop and restart eng. and trans. will start off normally

A '96 Elantra *without* the MIL on is a rare bird.  Anyway, you could
have a valve in the valvebody that is sticking once actuated with
fluid pressure.  I'm thinking that the 3rd and 4th ranges each employ
individual valves whose purpose is to lock out other unwanted
operations or to assist in holding the clutch pressure that is
supplied by the primary 3rd and 4th valves.  This is just an educated
guess; I've never studied this trans or had one apart.  The lack of
P07xx series codes (assuming there are none in memory) would suggest
that the input and speed sensors are working and that each gear range
is engaging when it should based on load and speed inputs.  That would
lead me to believe, as stated before, that the trans is mechanically
staying in too high a gear during decel.  The trans ecu most likely
doesn't set speed/rationality codes during decel.

Your car doesn't actually *die* when you come to a stop, does it?

Toyota MDT in MO
wilderbillyof43@yahoo.com - 15 Mar 2007 22:11 GMT
> On Mar 13, 5:02 pm, wilderbillyo...@yahoo.com wrote:
>
[quoted text clipped - 20 lines]
>
> Toyota MDT in MO

no the car stops normally and runs fine it just wants to start off in
high gear upon acceleration
Comboverfish - 16 Mar 2007 13:17 GMT
On Mar 15, 4:11 pm, wilderbillyo...@yahoo.com wrote:

> > On Mar 13, 5:02 pm, wilderbillyo...@yahoo.com wrote:
>
[quoted text clipped - 23 lines]
> no the car stops normally and runs fine it just wants to start off in
> high gear upon acceleration- Hide quoted text -

So there isn't a torque converter or TC pressure circuit problem.
Then I stand by my initial WAG : )

Toyota MDT in MO
 
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