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Car Forum / Dodge / Dodge Trucks / February 2004

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1995 Dodge Diesel Automatic Transmission Guru needed! Help!

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CommanderDave - 27 Feb 2004 04:50 GMT
Hello all,

I have a 1995 Dodge Diesel with auto trans. Here is my problem:

Between about 65mph and 70mph (where I spend most of my time) the
transmission will drop out of OD. ie..the rpm's increase. Then it will go
back into OD. ie...rpms drop. This happens at low loads, typically a level
road, or even a very slight downgrade. It will keep cycling every 30 seconds
to a minute. This is a major pain in the a.s! If i get over 70 problems goes
away. If i am pulling a grade at any speed problem goes away.

Hope a smart Dodge guy takes pity on me and tells me what the hell is going
on. Thanks for the help...dave
Joseph Myers - 27 Feb 2004 06:42 GMT
www.turbodiesel.com

>Hello all,
>
[quoted text clipped - 9 lines]
>Hope a smart Dodge guy takes pity on me and tells me what the hell is going
>on. Thanks for the help...dave
CommanderDave - 27 Feb 2004 14:37 GMT
Hello Joeseph, I'm not having much luck with Turbodiesel. They have pop up
windows right and left and keep asking if I want them to be my home page. As
an example I have put in this post thier three first hits for the enquiry
"Transmission Advice". I don't think a psychic, even a "extremely gifted"
one is the answer.

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############################################################################
###########

> www.turbodiesel.com
>
[quoted text clipped - 11 lines]
> >Hope a smart Dodge guy takes pity on me and tells me what the hell is going
> >on. Thanks for the help...dave
Contrail - 28 Feb 2004 17:15 GMT
It is definently your Throttle Position Sensor. This is quite common with 94 through early 98 trucks. It has to do with electrical interference causing fluctuations in the TPS signal going to the Powertrain Control Module which determines when the transmission should shift into overdrive. It is located on the drivers side ( http://www.dodgeram.org/tech/dsl/Facts/12Ve_locations-l.gif )near the front of the engine. Fixes have included spraying the TPS with contact cleaner, pulling the TPS wiring out of the main wiring harness, installing noise filters, rewiring the TPS wiring with shielded wiring, and even taking apart the TPS and giving it a good cleaning. Below are some links to read regarding this common problem.

http://www.turbodieselregister.com/forums/showthread.php?s=&threadid=91396&highl
ight=throttle+position+sensor


http://www.turbodieselregister.com/forums/showthread.php?s=&threadid=90740&highl
ight=throttle+position+sensor


http://www.turbodieselregister.com/forums/showthread.php?s=&threadid=94812

http://www.dodgeram.org/tech/transmission/automatic/TPS_adjust.htm
Roy - 27 Feb 2004 07:41 GMT
> Hello all,
>
[quoted text clipped - 9 lines]
> Hope a smart Dodge guy takes pity on me and tells me what the hell is going
> on. Thanks for the help...dave

Could be the TPS.

Roy
CommanderDave - 27 Feb 2004 14:31 GMT
> > Hello all,
> >
[quoted text clipped - 16 lines]
>
> Roy

Hello Roy, I'm afraid I don't know what a "TPS" is. Could you give me a
little more info? Thanks...dave
TransSurgeon - 27 Feb 2004 14:43 GMT
> Hello Roy, I'm afraid I don't know what a "TPS" is. Could you give me a
> little more info? Thanks...dave

Throttle Position Sensor

tells ECM when to shift it

the TPS develops a wear spot at the point where 50-60 mph occurs, when the
computer sees a 'glitch' at that spot, it assumes that the driver has either
floor-boarded the throttle or let off it completely

either way, it unlocks the converter clutch, if the former, it downshifts
CommanderDave - 27 Feb 2004 15:05 GMT
> > Hello Roy, I'm afraid I don't know what a "TPS" is. Could you give me a
> > little more info? Thanks...dave
[quoted text clipped - 8 lines]
>
> either way, it unlocks the converter clutch, if the former, it downshifts

Hello Roy, Wow! I know guru stuff when I see it, and your it! Thanks a
lot...dave
Contrail - 28 Feb 2004 17:35 GMT
It's you TPS. It's a common problem. The shifting is caused by electrical interference in the signal line from the throttle position sensor to the powertrain control module. Several fixes have been suggested including cleaning TPS by spraying it with contact cleaner, pulling the TPS wiring from the main wiring harness, rewiring the TPS wires with shielded wiring from the powertrain control module, installing an electrical noise filter, pulling apart the TPS itself and cleaning it. The TPS itself is a very expensive part and is usauly replaced as a last resort. Check out the following web site for more info.

http://www.dodgeram.org/tech/dsl/Facts/12Ve_locations-l.gif

http://www.turbodieselregister.com/forums/showthread.php?s=&threadid=94812


Contrail - 28 Feb 2004 17:35 GMT
It's you TPS. It's a common problem. The shifting is caused by electrical interference in the signal line from the throttle position sensor to the powertrain control module. Several fixes have been suggested including cleaning TPS by spraying it with contact cleaner, pulling the TPS wiring from the main wiring harness, rewiring the TPS wires with shielded wiring from the powertrain control module, installing an electrical noise filter, pulling apart the TPS itself and cleaning it. The TPS itself is a very expensive part and is usauly replaced as a last resort. Check out the following web site for more info.

http://www.dodgeram.org/tech/dsl/Facts/12Ve_locations-l.gif

http://www.turbodieselregister.com/forums/showthread.php?s=&threadid=94812


Roy - 28 Feb 2004 21:18 GMT
> It's you TPS. It's a common problem. The shifting is caused by electrical interference in the signal line from the throttle position sensor to the
powertrain control module. Several fixes have been suggested including
cleaning TPS by spraying it with contact cleaner, pulling the TPS wiring
from the main wiring harness, rewiring the TPS wires with shielded wiring
from the powertrain control module, installing an electrical noise filter,
pulling apart the TPS itself and cleaning it. The TPS itself is a very
expensive part and is usauly replaced as a last resort. Check out the
following web site for more info.

> http://www.dodgeram.org/tech/dsl/Facts/12Ve_locations-l.gif
>
> http://www.turbodieselregister.com/forums/showthread.php?s=&threadid=94812

Spray your send button will ya.

Dave,vone thing it could be other than the tps, is the stop light switch at
your brake pedal. Check that first, it is easier and dosen't cost as much.
You might get lucky.

Roy
CommanderDave - 28 Feb 2004 23:00 GMT
Hello all,

Thanks for the help from everyone. I had gone to this web page:
http://www.dieseltruckresource.com/showthread/t-36941.html. They have a
person who posted there who had a diagram and everything!

I went down and got a can of electrical contact cleaner. Got back home, and
sprayed the TPS shaft, where it goes into the TPS. Then took a quick 20 mile
trip mile down the freeway. Before it would shift in and out at least 20
times. Today, perfect!

I love you guys!

.....dave

############################################################################
#####

> Hello all,
>
[quoted text clipped - 9 lines]
> Hope a smart Dodge guy takes pity on me and tells me what the hell is going
> on. Thanks for the help...dave
Roy - 28 Feb 2004 23:39 GMT
> Hello all,
>
[quoted text clipped - 6 lines]
> trip mile down the freeway. Before it would shift in and out at least 20
> times. Today, perfect!

Glas things worked out for ya!!

Roy
 
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