Diagnosing Park Ave torque converter clutch problem
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Diagnosing Park Ave torque converter clutch problem

 
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Ed
Guest
Posted: Tue Nov 29, 2005 12:23 am    Post subject: Diagnosing Park Ave torque converter clutch problem Reply with quote
I've been having intermittant, momentary loss of power to the wheels
while
driving at freeway speeds in our '95 Park Ave Ultra. I've posted this
here before
and gotten some tips, which I've followed up on. For example, pursuing
the possibility that
it was an engine misfiring problem I replaced the plugs and wires, and
my mechanic
replaced the mass flow sensor based on his (rather expensive) hunch.
Unfortunately, the
problem is still there.

I now believe it is the torque converter clutch (TCC) and want to
confirm the diagnosis.
I can cause the problem to occur by accelerating on an up-grade, e.g.,
the approach to
a freeway fly-over interchange. Rather than accelerating smoothly
there will be
an irregular pulsing or jerking in the acceleration. If I then tap the
brake, it
stops jerking and accelerates smoothly.

Is this a conclusive diagnosis of TCC failure?

The second question is what is required to fix it. I will of course
take it to a transmission
shop, but would like to go in with some idea what to expect.

Thanks in advance for your help.

Ed

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Shep
Guest
Posted: Tue Nov 29, 2005 2:59 am    Post subject: Re: Diagnosing Park Ave torque converter clutch problem Reply with quote
Not being a wise guy here but it seems like a lot og guess work has been
done here. If you get a trans capable bi-directional scanner on this with an
experienced operator, he can see if the tcc is in fact slipping when
commanded by looking at slippage errors/percentages this will confirm or
deny the tcc as the problem. By tapping the brake you are also unloading the
engine so a slight misfire would be eliminated.
"Ed" <jag_manR__EM*-0_V_E653@hotmail.com> wrote in message
news:aWHif.25348$Zv5.12752@newssvr25.news.prodigy.net...
Quote:

I've been having intermittant, momentary loss of power to the wheels
while
driving at freeway speeds in our '95 Park Ave Ultra. I've posted this here
before
and gotten some tips, which I've followed up on. For example, pursuing the
possibility that
it was an engine misfiring problem I replaced the plugs and wires, and my
mechanic
replaced the mass flow sensor based on his (rather expensive) hunch.
Unfortunately, the
problem is still there.

I now believe it is the torque converter clutch (TCC) and want to confirm
the diagnosis.
I can cause the problem to occur by accelerating on an up-grade, e.g., the
approach to
a freeway fly-over interchange. Rather than accelerating smoothly there
will be
an irregular pulsing or jerking in the acceleration. If I then tap the
brake, it
stops jerking and accelerates smoothly.

Is this a conclusive diagnosis of TCC failure?

The second question is what is required to fix it. I will of course take
it to a transmission
shop, but would like to go in with some idea what to expect.

Thanks in advance for your help.

Ed






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Ed
Guest
Posted: Tue Nov 29, 2005 3:19 am    Post subject: Re: Diagnosing Park Ave torque converter clutch problem Reply with quote
Thanks, Shep. Is the "trans capable bi-directional scanner" something
that a typical
shop should have, or only available at dealers?


"Shep" <djsljsrn@capital.net> wrote in message
news:1133211720_39163@spool6-east.superfeed.net...
Quote:

Not being a wise guy here but it seems like a lot og guess work has
been done here. If you get a trans capable bi-directional scanner on
this with an experienced operator, he can see if the tcc is in fact
slipping when commanded by looking at slippage errors/percentages
this will confirm or deny the tcc as the problem. By tapping the
brake you are also unloading the engine so a slight misfire would be
eliminated.
"Ed" <jag_manR__EM*-0_V_E653@hotmail.com> wrote in message
news:aWHif.25348$Zv5.12752@newssvr25.news.prodigy.net...

I've been having intermittant, momentary loss of power to the
wheels while
driving at freeway speeds in our '95 Park Ave Ultra. I've posted
this here before
and gotten some tips, which I've followed up on. For example,
pursuing the possibility that
it was an engine misfiring problem I replaced the plugs and wires,
and my mechanic
replaced the mass flow sensor based on his (rather expensive)
hunch. Unfortunately, the
problem is still there.

I now believe it is the torque converter clutch (TCC) and want to
confirm the diagnosis.
I can cause the problem to occur by accelerating on an up-grade,
e.g., the approach to
a freeway fly-over interchange. Rather than accelerating smoothly
there will be
an irregular pulsing or jerking in the acceleration. If I then tap
the brake, it
stops jerking and accelerates smoothly.

Is this a conclusive diagnosis of TCC failure?

The second question is what is required to fix it. I will of course
take it to a transmission
shop, but would like to go in with some idea what to expect.

Thanks in advance for your help.

Ed






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120,000+ Newsgroups
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Ed
Guest
Posted: Tue Nov 29, 2005 3:23 am    Post subject: Re: Diagnosing Park Ave torque converter clutch problem Reply with quote
Forgot to mention that this morning the "Traction off" dash warning
light came on. Punching the
button did not get it to go off. We normally never touch this button,
having no real use
for this feature in our mild climate.

Could this be related to the other problem I described?

Ed

"Shep" <djsljsrn@capital.net> wrote in message
news:1133211720_39163@spool6-east.superfeed.net...
Quote:

Not being a wise guy here but it seems like a lot og guess work has
been done here. If you get a trans capable bi-directional scanner on
this with an experienced operator, he can see if the tcc is in fact
slipping when commanded by looking at slippage errors/percentages
this will confirm or deny the tcc as the problem. By tapping the
brake you are also unloading the engine so a slight misfire would be
eliminated.
"Ed" <jag_manR__EM*-0_V_E653@hotmail.com> wrote in message
news:aWHif.25348$Zv5.12752@newssvr25.news.prodigy.net...

I've been having intermittant, momentary loss of power to the
wheels while
driving at freeway speeds in our '95 Park Ave Ultra. I've posted
this here before
and gotten some tips, which I've followed up on. For example,
pursuing the possibility that
it was an engine misfiring problem I replaced the plugs and wires,
and my mechanic
replaced the mass flow sensor based on his (rather expensive)
hunch. Unfortunately, the
problem is still there.

I now believe it is the torque converter clutch (TCC) and want to
confirm the diagnosis.
I can cause the problem to occur by accelerating on an up-grade,
e.g., the approach to
a freeway fly-over interchange. Rather than accelerating smoothly
there will be
an irregular pulsing or jerking in the acceleration. If I then tap
the brake, it
stops jerking and accelerates smoothly.

Is this a conclusive diagnosis of TCC failure?

The second question is what is required to fix it. I will of course
take it to a transmission
shop, but would like to go in with some idea what to expect.

Thanks in advance for your help.

Ed






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Shep
Guest
Posted: Tue Nov 29, 2005 4:41 am    Post subject: Re: Diagnosing Park Ave torque converter clutch problem Reply with quote
All quality trans shops have the scanner I spoke of, of course dealers also.
Trac problem may be related in that it is disabled for some pcm /operating
problems, this would require a scan, again to see what's what.
"Ed" <jag_manR__EM*-0_V_E653@hotmail.com> wrote in message
news:xzKif.34197$6e1.16912@newssvr14.news.prodigy.com...
Quote:

Forgot to mention that this morning the "Traction off" dash warning light
came on. Punching the
button did not get it to go off. We normally never touch this button,
having no real use
for this feature in our mild climate.

Could this be related to the other problem I described?

Ed

"Shep" <djsljsrn@capital.net> wrote in message
news:1133211720_39163@spool6-east.superfeed.net...

Not being a wise guy here but it seems like a lot og guess work has been
done here. If you get a trans capable bi-directional scanner on this with
an experienced operator, he can see if the tcc is in fact slipping when
commanded by looking at slippage errors/percentages this will confirm or
deny the tcc as the problem. By tapping the brake you are also unloading
the engine so a slight misfire would be eliminated.
"Ed" <jag_manR__EM*-0_V_E653@hotmail.com> wrote in message
news:aWHif.25348$Zv5.12752@newssvr25.news.prodigy.net...

I've been having intermittant, momentary loss of power to the wheels
while
driving at freeway speeds in our '95 Park Ave Ultra. I've posted this
here before
and gotten some tips, which I've followed up on. For example, pursuing
the possibility that
it was an engine misfiring problem I replaced the plugs and wires, and
my mechanic
replaced the mass flow sensor based on his (rather expensive) hunch.
Unfortunately, the
problem is still there.

I now believe it is the torque converter clutch (TCC) and want to
confirm the diagnosis.
I can cause the problem to occur by accelerating on an up-grade, e.g.,
the approach to
a freeway fly-over interchange. Rather than accelerating smoothly there
will be
an irregular pulsing or jerking in the acceleration. If I then tap the
brake, it
stops jerking and accelerates smoothly.

Is this a conclusive diagnosis of TCC failure?

The second question is what is required to fix it. I will of course take
it to a transmission
shop, but would like to go in with some idea what to expect.

Thanks in advance for your help.

Ed






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Newsgroups
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