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'03 GC - Transmission Downshift Bump

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'03 GC - Transmission Downshift Bump

  #1  
Old 02-27-2007, 12:48 PM
hemmi
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Default '03 GC - Transmission Downshift Bump

Hi all,

I've started to get a hard bump everytime the tranmission shifts down from what's seems to be second gear. I have no other problems with the transmission. Everything else is smooth! 100k on it.

I am going to take it in for a diagnosis but would like to hear your ideas.


Thanks,
 
  #2  
Old 02-28-2007, 12:27 PM
fperezal
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Default RE: '03 GC - Tranmission Downshift Bump

Mine doing the same. My 2003 3.3L GC has 89K miles. Changed fluid, still doing it. Let me know what happens...PLEASE!
 
  #3  
Old 03-06-2007, 06:51 PM
hemmi
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Default RE: '03 GC - Tranmission Downshift Bump

Well, I got the word from the dealer. They said:
1) replace the throttle position sensor
2) perform a throttle bottle service/cleaning

I am going to replace the sensor ($32cad) and go from there. Anyone have any instrucions or know if its a hard job?
 
  #4  
Old 03-06-2007, 10:31 PM
fperezal
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Default RE: '03 GC - Tranmission Downshift Bump

Did the dealer tell you that over the phone or did they look at it? This dont make sense to me.....not at all. Its easy to do, but I dont see the relationship. I mean, after removing the foot off the pedal, as the van come to a stop, the bumps is felt as there is no imput to the TPS...it just non-sense....please keep me inform.
 
  #5  
Old 03-08-2007, 12:13 AM
hemmi
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Default RE: '03 GC - Tranmission Downshift Bump

Ok, I replaced the sensor and it did the trick. Don't ask me how. It was located on back of the throtle body and required a torx socket.

Dealer saidit was the "throtle position sensor". Part description on invioce was 'ac sensor'.

Thanks
 
  #6  
Old 03-08-2007, 01:13 PM
fperezal
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Default RE: '03 GC - Tranmission Downshift Bump

So you are telling me that the downshift bump is gone after replacing the TPS?
 
  #7  
Old 03-08-2007, 01:19 PM
hemmi
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Default RE: '03 GC - Tranmission Downshift Bump

MYdownshift bump is gone. Are you still skeptical? Its a $30cad part and 20min, can't really go wrong.
 
  #8  
Old 03-08-2007, 03:59 PM
fperezal
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Default RE: '03 GC - Tranmission Downshift Bump

Will do the TPS replacement. I'll get back here to report the results. Thanks.
 
  #9  
Old 03-10-2007, 03:50 AM
BEEBOW
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Default RE: '03 GC - Tranmission Downshift Bump

I have the same problem on my 01' Caravan. I took it to the Tranny shop and they said that it's the tranny mount. I had my wife shift from park to reverse to drive while I watched the engine and the movement proved out the mount problem. I am changing it tomorrow and will let you guys know what happens.
 
  #10  
Old 03-10-2007, 12:39 PM
fperezal
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Default RE: '03 GC - Tranmission Downshift Bump

BEEBOW:

An defective engine/transmission mountwill not give you the downshifting bump in question. A downshifting bump, even that is very fast, is a fade-in fade-outshift transition, while a bad mount bump is felt in the body as a hevy object impacting its mount. Very different stuff. Thanks for your comment anyway.
 

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