Hi,

My old car had some strange behavior last week. I have an automatic
transmission, and when I was accelerating (from idle) the RPM seemed
to climb very high without changing gears. So (before the engine blew
or something) I released the gaz pedal and it went back to normal when
I started accelerating again. It did so 3-4 times in a row.

I must say that day it was raining, maybe that could've affected. Also
I tried with and without the "power" button near the transmission. The
only thing that seemed to fix my problem was to dis-engage the
"overdrive". After that it never happened again.

I took the car the day after and with or without overdrive it went
well... I just don't know what to think. Do you think the transmission
is slowly dieing?

Thanks!

 

If it didn't act like it was in neutral, it's probably a simpler issue
such as a pulse generator or poor contact in the pulse generator
connector. If the transmission control module doesn't receive proper
information regarding the transmission input and output speeds, it doesn't
know when to properly shift the transmission. This can also happen if the
throttle position sensor provides an erroneous signal, causing the
transmission control module to think you have the accelerator floored.

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On May 20, 5:40 pm, "hyundaitech" <notpub...@not.public.com> wrote:
> If it didn't act like it was in neutral, it's probably a simpler issue
> such as a pulse generator or poor contact in the pulse generator
> connector. If the transmission control module doesn't receive proper
> information regarding the transmission input and output speeds, it doesn't
> know when to properly shift the transmission. This can also happen if the
> throttle position sensor provides an erroneous signal, causing the
> transmission control module to think you have the accelerator floored.
>
> --
> Message posted usinghttp://www.talkaboutautos.com/group/alt.autos.hyundai/
> More information athttp://www.talkaboutautos.com/faq.html

No it was really acting as though it was in neutral.
But it's been 2 days it OK.

 

That's not good, then. The range switch and shift cable (and their
adjustment) as well as the fluid level are suspect, but more likely you
have a serious transmission problem.

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"Julien BH" <julienbh@gmail.com> wrote in message
news:ea78030b-67a8-42ce-95d2-47ffa613711a@z72g2000hsb.googlegroups.com...
> On May 20, 5:40 pm, "hyundaitech" <notpub...@not.public.com> wrote:
>> If it didn't act like it was in neutral, it's probably a simpler issue
>> such as a pulse generator or poor contact in the pulse generator
>> connector. If the transmission control module doesn't receive proper
>> information regarding the transmission input and output speeds, it
>> doesn't
>> know when to properly shift the transmission. This can also happen if
>> the
>> throttle position sensor provides an erroneous signal, causing the
>> transmission control module to think you have the accelerator floored.
>>
>> --
>> Message posted
>> usinghttp://www.talkaboutautos.com/group/alt.autos.hyundai/
>> More information athttp://www.talkaboutautos.com/faq.html
>
> No it was really acting as though it was in neutral.
> But it's been 2 days it OK.

Here's your original post:

> My old car had some strange behavior last week. I have an automatic
> transmission, and when I was accelerating (from idle) the RPM seemed
> to climb very high without changing gears. So (before the engine blew
> or something) I released the gaz pedal and it went back to normal when
> I started accelerating again. It did so 3-4 times in a row.

Now you are saying it acted like it was in neutral. What you describe above
is far from acting like it was in neutral. You are describing a
transmission that is not shifting out of a lower gear. Acting like it was
in neutral would mean that the car never moved. The most important part of
getting help with problems like this is accurate descriptions of the
problem. You might want to backtrack a bit and straighten out the confusion
at this point.

--

-Mike-
mmarlowREMOVE@alltel.net

 

"hyundaitech" <notpublic@not.public.com> wrote in message
news:4011912ea54597b91cf7c635456fb24d@localhost.ta lkaboutautos.com...
> That's not good, then. The range switch and shift cable (and their
> adjustment) as well as the fluid level are suspect, but more likely you
> have a serious transmission problem.
>

Not likely yet HT. Take a look back through - the OP has posted
contradictory descriptions of the problem. Well worth getting the problem
defined again.

--

-Mike-
mmarlowREMOVE@alltel.net

 

On May 21, 12:59 pm, "Mike Marlow" <mmarlowREM...@alltel.net> wrote:
> "hyundaitech" <notpub...@not.public.com> wrote in message
>
> news:4011912ea54597b91cf7c635456fb24d@localhost.ta lkaboutautos.com...
>
> > That's not good, then. The range switch and shift cable (and their
> > adjustment) as well as the fluid level are suspect, but more likely you
> > have a serious transmission problem.
>
> Not likely yet HT. Take a look back through - the OP has posted
> contradictory descriptions of the problem. Well worth getting the problem
> defined again.
>
> --
>
> -Mike-
> mmarlowREM...@alltel.net

You're right Mike. Sorry about the contradictions.
It was really acting like it was revving in neutral, (ie not going
faster and faster)
And then it skipped and the transmission entered in function again
(was not in neutral anymore). It did this 2-3 times at low speed. Once
the 3rd gear was on, the problem was not noticeable.
Thanks guys!

 

On May 21, 12:59 pm, "Mike Marlow" <mmarlowREM...@alltel.net> wrote:
> "hyundaitech" <notpub...@not.public.com> wrote in message
>
> news:4011912ea54597b91cf7c635456fb24d@localhost.ta lkaboutautos.com...
>
> > That's not good, then. The range switch and shift cable (and their
> > adjustment) as well as the fluid level are suspect, but more likely you
> > have a serious transmission problem.
>
> Not likely yet HT. Take a look back through - the OP has posted
> contradictory descriptions of the problem. Well worth getting the problem
> defined again.
>
> --
>
> -Mike-
> mmarlowREM...@alltel.net

Just to make sure everyone understood, the car was moving, but not
accelerating. Like if I was pressing the pedal in the neutral position.

 

"Julien BH" <julienbh@gmail.com> wrote in message
news:ad3c3e1c-b70d-44ed-84b0-35829e754b1a@w7g2000hsa.googlegroups.com...

>
> You're right Mike. Sorry about the contradictions.
> It was really acting like it was revving in neutral, (ie not going
> faster and faster)

So - to me, acting like it was in neutral would imply that it was coasting
to a stop. Did it appear to lose speed, or just not accelerate any further.
If the latter, then I'd suggest that the car was at a shift point, but not
shifting.

Sometimes the semantics are the hardest part...

--

-Mike-
mmarlowREMOVE@alltel.net

 

On May 21, 4:21 pm, "Mike Marlow" <mmarlowREM...@alltel.net> wrote:
> "Julien BH" <julie...@gmail.com> wrote in message
>
> news:ad3c3e1c-b70d-44ed-84b0-35829e754b1a@w7g2000hsa.googlegroups.com...
>
>
>
> > You're right Mike. Sorry about the contradictions.
> > It was really acting like it was revving in neutral, (ie not going
> > faster and faster)
>
> So - to me, acting like it was in neutral would imply that it was coasting
> to a stop. Did it appear to lose speed, or just not accelerate any further.
> If the latter, then I'd suggest that the car was at a shift point, but not
> shifting.
>
> Sometimes the semantics are the hardest part...
>
> --
>
> -Mike-
> mmarlowREM...@alltel.net

Wow that's really hard to answer. It's not like it stayed like that
for a minute. It was a question of seconds (like 2 or 3).
Yesterday I was driving and put my transmission to neutral while
moving. It was approximately the same thing.
But it would need to happen again for me to really answer your
question... (and I don't want that to happen haha)

 

"Julien BH" <julienbh@gmail.com> wrote in message
news:767c064d-f083-4528-ab45-bdaabdc2d81c@k13g2000hse.googlegroups.com...

>
> Wow that's really hard to answer. It's not like it stayed like that
> for a minute. It was a question of seconds (like 2 or 3).
> Yesterday I was driving and put my transmission to neutral while
> moving. It was approximately the same thing.
> But it would need to happen again for me to really answer your
> question... (and I don't want that to happen haha)

So, the next time, while it is acting up, take your foot off the gas and let
the car slow down 5-10 mph. Then, accelerate again. Does the car
accelerate, or not? If it does, then it sounds like the car is simply at a
shift point (what are the RPM's when this is happening?), but not shifting.
You reach a point in any gear, where the car runs out of the ability to
accelerate any further. If it does not, then it sounds like transmission
slippage and that would be costly.

You are really at a point though where you have to define the problem more
thoroughly. It's impossible to make any determinations from what you've
been able to describe to-date. I do not remember from previous posts - have
you had the transmission scanned? That would be a first order of business.

--

-Mike-
mmarlowREMOVE@alltel.net

 

"So, the next time, while it is acting up, take your foot off the gas and
let the car slow down 5-10 mph. Then, accelerate again. Does the car
accelerate, or not? If it does, then it sounds like the car is simply at
a shift point (what are the RPM's when this is happening?), but not
shifting."

This isn't necessarily true and isn't terribly helpful as a diagnostic
tool. While it's true that it could be an extended shift, one element of
the transmission could be slipping, causing for example, third gear to
slip. Upon slowing down to 10-15 MPH and accelerating, it's unlikely the
car will still be in third gear and will accelerate normally again until
it tries shifting into third. Either scenario, however, doesn't bode
well. Most likely, it's an internal transmission problem.


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"hyundaitech" <notpublic@not.public.com> wrote in message
news:2ea37a5f5d4311acb5897a6fad9899f5@localhost.ta lkaboutautos.com...
> "So, the next time, while it is acting up, take your foot off the gas and
> let the car slow down 5-10 mph. Then, accelerate again. Does the car
> accelerate, or not? If it does, then it sounds like the car is simply at
> a shift point (what are the RPM's when this is happening?), but not
> shifting."
>
> This isn't necessarily true and isn't terribly helpful as a diagnostic
> tool. While it's true that it could be an extended shift, one element of
> the transmission could be slipping, causing for example, third gear to
> slip. Upon slowing down to 10-15 MPH and accelerating, it's unlikely the
> car will still be in third gear and will accelerate normally again until
> it tries shifting into third. Either scenario, however, doesn't bode
> well. Most likely, it's an internal transmission problem.
>

No - I suggested simply slowing down 5-10mph. The issue I'm having is
understanding exactly what the OP is trying to say. I'm confused by the
different reports.

--

-Mike-
mmarlowREMOVE@alltel.net

 

On May 24, 12:14 am, "Mike Marlow" <mmarlowREM...@alltel.net> wrote:
> "hyundaitech" <notpub...@not.public.com> wrote in message
>
> news:2ea37a5f5d4311acb5897a6fad9899f5@localhost.ta lkaboutautos.com...
>
> > "So, the next time, while it is acting up, take your foot off the gas and
> > let the car slow down 5-10 mph. Then, accelerate again. Does the car
> > accelerate, or not? If it does, then it sounds like the car is simply at
> > a shift point (what are the RPM's when this is happening?), but not
> > shifting."
>
> > This isn't necessarily true and isn't terribly helpful as a diagnostic
> > tool. While it's true that it could be an extended shift, one element of
> > the transmission could be slipping, causing for example, third gear to
> > slip. Upon slowing down to 10-15 MPH and accelerating, it's unlikely the
> > car will still be in third gear and will accelerate normally again until
> > it tries shifting into third. Either scenario, however, doesn't bode
> > well. Most likely, it's an internal transmission problem.
>
> No - I suggested simply slowing down 5-10mph. The issue I'm having is
> understanding exactly what the OP is trying to say. I'm confused by the
> different reports.
>
> --
>
> -Mike-
> mmarlowREM...@alltel.net

Well well my friends, I'm back.
Guess what, today it was raining again ... so here came the slippage
thing with it.
When the transmission slips Mike, I'm at 10mph ALREADY. The problem is
located between the 1rst and 2nd gear since when I start going faster
the car behaves well.. I really think it's more of a transmission
problem.

When I let go of the pedal for like 5 seconds and I press again the
car starts accelerating but BANG! Shifts up (or down) at a bad moment
and the car don't like it. (ouch). It did that 3-4 times today. And
then it was okay again.

 

I don't know. I'm not so certain now. Depending on the problem, the TCM
may fail to shift the car into second gear when appropriate, resulting on
very high rpms until the TCM realizes there's a problem, and then it
abruptly shifts the car into third. I'm with Mike on this. You should
take the car to a professional (preferably a dealer-- they probably won't
want to toss a reman or do a rebuild for every possible problem-- to
experience the issue and perform a diagnosis.

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