Wont shift

Tiny
RAYDOG4270
  • MEMBER
  • 1999 DODGE DAKOTA
  • 6 CYL
  • 2WD
  • AUTOMATIC
I have a 1999 dodge dakota v6 it gets up to about 20mph and bout 1500rpms and thats it. It wont shift and or go any faster. It has no power on small inclines only bout 10mph. I changed the throttle postion sensor and it didn fix it any suggestions or answers would be great.
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Tuesday, March 29th, 2011 AT 6:29 PM

5 Replies

Tiny
CARADIODOC
  • EXPERT
What led you to the throttle position sensor for a transmission problem? It's time for a diagnosis from a transmission specialty shop. If you have the computer-controlled transmission, they will start by reading any stored diagnostic fault codes. If you have the older hydraulically-controlled transmission, they may need to perform a series of pressure tests to determine why it isn't shifting.

The inability to increase engine speed over 1500 rpm should not be related to transmission problems. There might be something in common you're not seeing such as a plugged catalytic converter or dragging brakes.
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Tuesday, March 29th, 2011 AT 6:45 PM
Tiny
RAYDOG4270
  • MEMBER
What led me to the tps was reading similar problems and that was it. Now a friend told me also if my throttle body is junk it will do the same im just looking for some other suggestions and answers. The trany has never show any signs of being bad and the tps and throttle body have some control when the truck should shift so that is the direction I was goin. Bad trany wont stop my rpms at a certain point and I thought it was unlikely the trany go out and catalytic converter go at same time. But thanks for reply ill look into all of it.
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Tuesday, March 29th, 2011 AT 8:24 PM
Tiny
CARADIODOC
  • EXPERT
Hmmm. It's true, the throttle position sensor can affect shifting, but mainly on the diesel engines with electronic throttle controls. On gas engines he actually has very little say in how much fuel enters the engine. Is it possible the transmission is not up-shifting in response to your having to push the gas pedal further than normal, and the real problem is just lack of acceleration?

Throttle body assemblies on Chrysler products hardly ever go bad. Your friend is going to have to be more specific than just "junk". Tell him that doesn't mean much. The only problem I've ever seen is worn throttle shaft bushings that allow air to sneak in past them. That will cause an increase in idle speed and possible surging.

Given your description, I think I would suspect a plugged catalytic converter first. There is a gauge mechanics use to measure the back pressure in the exhaust system. What you can check on your own is a plugged converter usually causes the engine to idle uncommonly smoothly and you will hear more of a hiss from the tail pipe instead of the normal "putt putt". It will sound similar to when you hold the bottom of your shoe over the end of the tail pipe.
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Tuesday, March 29th, 2011 AT 8:45 PM
Tiny
RAYDOG4270
  • MEMBER
Ok so I went out and started the truck to check the exhaust again and when I started it it spit and sputter a little and died then on restart it spit somemore and idled ruff but then leveled out and idled fine. There is plenty of pressure comin out the pipe by puttin your hand over it.

And as far as my friend and junk. Lol. He bout a new 07 dakota and two weeks later thought the tranny was out and sent it in to the dealer. It was doin everything mine is. The dealer said it was the throttle body few months later had same thing happen they changed throttle body again and he owned it for next 3 yrs problem free.

Now this chuggin and ruff idle today is first time thats happened. White exhaust from bein cold and plenty of pressure holdin my hand on it could that still be a catalytic converter problem? Or you think my throttle body could of gone bad?

I have the access to get another throttle body from a friend that owns a junk yard so maybe ill go ahead and put it on and see if thats not it prolly take it to a dealer let them run test on it and tell me whats up. Thanks for your help
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Tuesday, March 29th, 2011 AT 9:07 PM
Tiny
CARADIODOC
  • EXPERT
Holler back after you try the throttle body. If that solves it I'd sure like to know what was wrong with it.
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Tuesday, March 29th, 2011 AT 9:34 PM

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