Still no resolved issue for Jeep, any suggestions?

Question

I mentioned that my 04' Wrangler with automatic transmission was having a problem upshifting, especially uphill. As I approach a hill, maybe around 60rpm's, I'll start to give it more and morepedal pressure but the RPM's will not budge until pedal is almost at floor and all of a sudden will jump which seems pretty harsh on the jeep. I had another problem with downshifting recently and had the tps and map sensors replaced which helped that issue but this lack of upshift still remains. Could this be another electrical/computer problem? Any suggestions? Thanks!!

Answer 1

This will sound simple and you may have already tried this but have you had the tranny flushed and serviced. Also there is a pressure sensor (manaflold maybe but not the tps) that tells the tranny to dwn shift bay be just a bad sending unit.

Answer 2

Eautorepair.net has online access to factory service manuals for a small fee---should have some troubleshooting charts and procedures in there. Sounds like a shift diaphram is bad or kickdown cable is misadjusted possibly but I'm not totally familiar with 04 Jeep tranny's so I could not tell you if it's vacuum operated like they use to be or electronic. Under power train warranty yet?

Answer 3

If the transmission is vacuum operated, then the cable running from the throttle body to the transmission might need to be calibrated.

Haynes manuals contain a detailed procedure on how to calibrate the cable. In short, it is as simple as opening the throttle body to the WOT position and then pushing and holding the button on the tensioning device while allowing the throttle body to close.

This will only work if the 2004 has a non-electronic vacuum operated transmission.

Answer 4

My older chevy did that, it was a broken vacum hose at the tranny. Don't know if jeep used those or not.