Guess What Caused thiis Shifting Malfunction?

[ulflyer]

This happened to a friends '12 RT SE and these were the symptoms. See if you can guess what caused it. Answer will be provided tomorrow.

The one year old RT SE wouldn't downshift by itself at all. The only way was to manually downshift and when it came to a stop in 1st gear, it idled too low and usually stalled. Either keep a little throttle on it or get it into neutral quickly.

[billybovine]

[spyryder]

vacuum hose

[Chupaca]

Have an RS so I will wait to see...

[boborgera]

Do you know the answer, Or are you hoping someone will confirm your thoughts on the cause and fix.. .............

[ulflyer]

Do you know the answer, Or are you hoping someone will confirm your thoughts on the cause and fix.. .............

READ THE LAST SENTENCE:
"This happened to a friends '12 RT SE and these were the symptoms. See if you can guess what caused it. Answer will be provided tomorrow."

[Jeriatric]

This happened to a friends '12 RT SE and these were the symptoms. See if you can guess what caused it. Answer will be provided tomorrow.

The one year old RT SE wouldn't downshift by itself at all. The only way was to manually downshift and when it came to a stop in 1st gear, it idled too low and usually stalled. Either keep a little throttle on it or get it into neutral quickly.

1. Low oil level or

2. HCM malfunction - electrical or hydraulic

Best guess - the poor idle condition and the down shift problem are not related. Because manual shift requirement was indicated for downshifting from 5 to 4, 4 to 3, and 3 to 2.

[Kungfuspyder]

Symptoms of a split or broken vacuum line.

[Bob Denman]

Too much air in the front tires?

[Fusionfool]

Oh come on Now I won't be able to sleep tonight This is cruel and unusual punishment

[bruiser]

wrong brand of oil?

[Ken Thomas]

Too much air in the rear tire !!

[Dustybell]

Since mine is doing the exact same thing, I'm saying vacuum lines cracked.

[ulflyer]

Oh come on Now I won't be able to sleep tonight This is cruel and unusual punishment

OK, OK, I can't stand to see a grown men whine!

Several winners here, will have to split the prize; Bruiser is donating his leftover oil from the last change. I hear tell it was some new stuff sold by Dollar Store.

The problem was the VACUUM HOSE had serious dry rot cracks which according to the Tech was cheap stuff to begin with. He replaced it with some Honda hose. Mind you, this was in a one year old '12 RT!!

If only I knew how to replace mine I'd be buying some Honda hose and doing it for piece of mind.

[Jeriatric]

Wow!
Bad in a years time. Whoda thunk? Obviously a few did
We in the desert better start changing them annually.

[Illinois Boy]

Moral of the story...

"Always carry a roll of duct-tape with you".

It has been known to bring a trio of astronauts home...

[ulflyer]

The more I think about it, the more I want to change mine as a preventive measue but have looked at the Fiche till I'm crosseyed and can't find where its located. I know its somewhere on the left side as thats where the mechanice pulled the panels off. Its a tiny little hose, no bigger than a pencil and although it was in three pieces, I'd say about the length of a ballpoint pen.

Is this a do-it-yourselfer? If so, where the heck is it located?

[Big Arm]

If so, where the heck is it located?

Answer will be provided tomorrow.

[ulflyer]

Answer will be provided tomorrow.

I expect a detailed answer, with pics, or better yet, a video. Meanwhile I'll continue work putting in electrical outlets, shelves, and insulation in the 12 X 20 shed I just got to house the RT. Now I'll have a decent place to do maintenance.....when you provide the above mentioned pics!!

[Bob Ledford]

First off if it was a vacuum hose that went south in less then a year it was sure cheap hose with very poor quality assurance. An I thought GM was buying cheap hose?

Secondly you don't need Honda hose either. Just go to your local automotive parts store and buy a roll of Gates, or Anco, or Trico brand hose. It should be a couple of layers in wall thickness.

When you start running the new lines try to get as far from the heat as possible!

[ulflyer]

2 Cruysyn: you sent me a link but I can't get it to read. If you will, please resend it.

Thanks

[2 Cruysyn]

2 Cruysyn: you sent me a link but I can't get it to read. If you will, please resend it.

Thanks

I pulled my post because the more I looked the more I convinced myself I may have been barking up the wrong tree. Here's the illustration and the photo. If you're going to pull the plastic you may as well check all the vacuum lines while you're in there.

If you mess with the MAPS lines the replacements should be the same lengths as the lines you remove. They are 85mm long according to the Service Manual. Also "Tube length is calibrated and should not be tampered with. If otherwise, the engine may be improperly calibrated."


MAPS Vacuum Hoses.jpgVacuum Hose.jpg

[ulflyer]

I pulled my post because the more I looked the more I convinced myself I may have been barking up the wrong tree. Here's the illustration and the photo. If you're going to pull the plastic you may as well check all the vacuum lines while you're in there.

If you mess with the MAPS lines the replacements should be the same lengths as the lines you remove. They are 85mm long according to the Service Manual. Also "Tube length is calibrated and should not be tampered with. If otherwise, the engine may be improperly calibrated."


MAPS Vacuum Hoses.jpgVacuum Hose.jpg

No wonder I couldn't find it on my svc CD....thought it would be down around the transmission somewhere.
I've made a copy of the pic and will confirm with the mechanic next time i go to the shop, but it looks like what he replaced. Thanks a lot for the pic.

[ulflyer]

Pulled the left side plastic and the left side black cover underneath (2 screws) to get at the offending vac line shown in the above picture kindly supplied by 2 Cruysyn . That line is exactly 8.5mm long (about 3 1/2 in) and mine was flexible with no signs of cracking.

Other threads have referred to two or more vac lines but I couldnt find any in that same general area.

Can someone point me to the "other/s" while I still have the plactic off?

[2 Cruysyn]

Pulled the left side plastic and the left side black cover underneath (2 screws) to get at the offending vac line shown in the above picture kindly supplied by 2 Cruysyn . That line is exactly 8.5mm long (about 3 1/2 in) and mine was flexible with no signs of cracking.

Other threads have referred to two or more vac lines but I couldnt find any in that same general area.

Can someone point me to the "other/s" while I still have the plactic off?

The other line I would think should be in a similar location on the other (forward) throttle, for lack of a better word. They should both be attached to the MAPS so find the other one and trace it back, or forward in this case.