When cold my Jeep Grand Cherokee 5.2 will not change up to 3rd
There are no problems in1st & 2nd, but does not change to 3rd until I either rev it to over 3000 revs or take my foot completely off the accelerator.Even at normal running temperature it can reoccur occasionally.Could I need to replace output sensor or govenor pressure /thermister sensor as has been suggested in the Jeep online forum?
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Check the kick down cable. If it sticks the transmission won't shift. I sprayed WD-40 on both the top and bottom connectors , and it worked like a charm. It's alot cheaper them spending 2000 on a new transmission you don't really need.
I'd begin by having the trans fluid changed and making sure there isn't an excessive amount of debris in the pan (there is always some but should not be obviously a lot) You may have a slight varnish buildup inside that becomes less sticky as the internal temp rises.
Battery should be around 12V the alternator puts out 14V. Sounds like a fuel problem, leaking injectors or injector's O-rings. Weak or faulty fuel pump, clogged fuel filter, faulty fuel regulator. Try this, when starting the car while cold. Put the key all the way to the ON position, wait five to ten seconds then crank the car to start. It should start the first time the longer you give it the more fuel pressure there will be to start the car.
I had a shifting problem. The car would start in the wrong gear and shift at wrong times. I repaced the governor postion sensor and tranny fluid and the problem has been fixed for several years. Did you replace the tranny fluid?