Transmission not shifting right?

I have a 1996 Nissan maxima. When I shift from parking to drive it does not shift after I accelerate. I manually shift to drive all the way to drive1 but it just stays in drive one and does not shift. It is full of oil. I have Check it hot. I let the car warm up before I go. This happen all of a sudden when I had to brake hard to avoid a speed bump on the road. The car seemed to hesitate but the transmission failed to change from there on. Also the speedometer stopped working about a week ago. Don't know if that is related to the transmission problem. Thank you very much.

I have owned 6 maximas, 4 of the 6 would not down shift in 1st gear on quick or sudden stop and go situations, and the gas pedal would be very firm unless you stomped on it to go, then it would jump to about 5500rpm and take off like a rocket. Also 5of the 6 have a rattle on passenger side door or. Any insight would be appreciated

1995 Nissan Maxima mileage: 125,000. About 20,000 miles ago I had #1 fuel injector replaced on my car. This August they replaced #2. I recently took my car in because my transmission is not shifting right and was told that my #1 fuel injector is bad again. They cannot find out about my transmission until the #1 fuel injector is replaced again! Another $350.00. What can be causing this and do I have any recourse. I have always made sure to put good gas in my car and had all the service it needed. Except they also told me, it is due for its 60,000 Service, which will be another $350.00. I can't afford all of this.

20,000 miles is a little soon for a new injector to go bad. What comes to mind is the possibility the fuel filter is letting sediment pass by which ends up plugging the fuel injectors. The #1 injector may be the first one on the loop. If the engine is not running properly, it would be difficult to diagnose transmission problems. The 60,000-mile service probably includes replacing the timing belt. Sorry we wish we could help you more.

I want to buy a used 1994 Nissan Maxima with 163,000 miles on it for my daughter. The car is in great shape, engine runs like a top but the transmission does not shift out of 2nd? Or go over 30-35 mph. Could this be a minor problem? Please help.

I power washed the engine and transmission of my 92 maxima SOHC engine type VG30E. I usually clean my engine/transmission twice a year. After this washing the transmission immediately began shifting very erratically, "i.E." Upshifting and downshifting spontaneously as well as slipping out of gear. Have I water contaminated a shift computer or shift govenor? Will blowing all electrical weather connectors out with high pressure air be of any benefit? I've not experienced this before although this transmission was pulled and re-installed twice within the past 18 months. The car is virtually undriveagble at this point. Appreciate any thoughts.

The check engine light never came on. I wish it had as I have my own OBD1 and 2 hand helds. Would make my life easier. I blew out all the weather connectors last evening but havent had a chance to road test the vehicle yet. I contacted the Nissan Dealer and learned a replacement Shift Control Computer will run $750 and change. Difficult for me to believe it's anything other than a short secondary to water contamination. None of my repair manuals (cheap ones) have a wiring schematic for this Shift Controler circuit. Will likely have to go to the public library to copy one. I am curious if there is a specific shift control relay under the hood that may have gone south, are you aware of a relay in this circuit?

Understood, will do.

Tried to run transmission diagnostic algorythm about half a dozen times--never could get the dash power light to flash any codes.

I'm still focused on figuring out this shift control circuit. I'm still thinking I've contaminated something with water when I washed the engine and I'm overlooking some connection or relay. I wouldnt rule out the shift control computer as being bad or the main onboard computer as being bad for that matter. I dont mind replacing computers at all as I've got good after factory vendors with more reasonable prices but I hate to replace a unit not knowing if that is the system fault.
I'll keep cogitating the issue and let you know if I find anything more. I'll review this web sites letter archives to see if I can spot a like problem and remedy.
Will be in touch. Thank you for your help.

Car will not shift into 3rd or od. The speedometer was not working so I replaced veh. Speed sensor from junk yard. Speedo is now working but still does not shift to 3rd gear. Someone told me that revolution sensor can cause not to shift properly. The rpm needle does work though. I have not replaced revolution sensor yet. I also replaced the throttle position sensor. I also got a used a/t control unit but that did not change anything. I took car in for diagnostic test at a non-nissan place. He said he could not get a reading, that computer was not communicating with the car. Please help me!

Thanks for your response. If you mean the "Check Engine Light" when referring to the "Power Light" as the test protocol does the check engine light is illuminated whenever I have the ignition switch in the ON position. It naturally came on each time I ran the test protocol when I switched to ignition switch to the ON position as directed. It never gave me a make or break code flashing pattern during any of the test algorythms like I'm used to seeing with the older pre 90's computers.
SOOOoooo.I'm still stumped as to being able to pull up a fault diagnostic code.
I also noticed I mispoke yesterday when I stated I had both an OBD I and OBD II handheld. I do not have an OBD I tester. Used to use the old paper clip maneuver for reading those codes.