I have Acura 2004 MDX and the problem I am haivng is tha it will not shift from 3rd to 4th gear and the engine noise is high. It will shift from 1st to 2nd to 3rd. At the same time the RPM gauge goes up and drops. What could be the problem? Thanks

05 Chrysler pacifica is a 4 speed automatic, next time buy a car with a 5 speed automatic

check and replace the TCM

You change the transmission control molcule (TCM).

Somehow it is effecting the TPS (Throttle position sensor) This is the only input to go to third to fouth and not seeing the proper gear change VSA light appears.

sounds like the rockers or lifters have some play due to wear.you don`t say what rpm you are shifting at other than high rpm.by changing the oil you have increased the viscosity of the oil as its new and not dirty and thin and cold oil is thicker than warm oil.you might want to try a heavier oil to see if it helps.you may not get this noise out unless you replace components or adjustment of rockers if they are adjustable.if its not very bad you may have to live with it.

Hi, It may be in LIMP mode.

What is "limp-home mode" ? This is a fault mode in which the transmission either loses electrical power or the PCM deactivates all of the electronics. The transmission will default to max line pressure. The driver will have Reverse and 3rd, with manual 2nd available by putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC lockup will not be available. It will not hurt the car to drive it like this for short periods, but use manual 2nd to get the car moving, and be aware that the trans will generate more heat than normal while operating in limp-home mode due to increased torque converter slippage during 2nd gear starts and no lockup in 3rd gear.

Common failures on 4L60E, symptom any possible repair:

Trans shifts into gear harshly, car feels sluggish off the line, No 1st, 4th or TCC lockup available, Manual 2nd, 3rd and Reverse are only available gears, CEL is on: Transmission is either in limp-home mode or has lost electrical power. If there are lots of error codes in the PCM, check the under-hood fuse that powers the transmission, and if it pops again, look for a short in that circuit like an O2 sensor harness touching exhaust. Otherwise, check PCM codes for a particular fault in the transmission causing the PCM to put it in limp-home mode.

No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD and locks the converter :ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

Car goes into gear but feels very sluggish like the brakes are dragging, but it will roll easily (starts out in 4th gear), you manually shift to 2 to get it moving, once it's moving you put it back in OD and the car shifts 3rd to 4th on its own and locks the converter at the appropriate time: ShiftB solenoid failed: Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

Trans seems noisy when moving in 1st and Reverse, noise goes away instantly if you shift to N or the trans goes into 3rd gear: Reaction planetary is worn out due to high miles or insufficient lubrication. Not a critical failure, but not a good sign either. R&R sooner rather than later.

3rd gear starts, can manually shift through all gears. When car has been turned off for a bit, then back on it will run normally.: VSS dropoff w/ Hi-stall converter. The rpms are too high, but VSS is showing no movement. Happens after a tire burning take-off. Doesn't store a code, will not throw a CEL (I've heard that it will store a code if it happens 3 or more times). Cure: Reprogram PCM for VSS dropoff -- PCMforLess knows about it.

If you can get the Jimmy for no more then $500.00 and the engine sounds good and body is good, you may want to invest in the repair of the jimmy. Also note that to have a close look at the fuel line along the frame on the drivers side just by the back doors, the line is know to corroded there on all the SUV's

Your pressure plate must be weak and about to let go.

First service tranny ( change fluid and replace filter) go to autozone for your parts.

Hi,

This might be because of the gear box problem. By any chance, did your car face flooding? In such cases, please drain the gear box and replace it with new gear fluids. Also, check if you go in low speeds, you might be able to engage it with ease. Please come back to me if you feel this doesnt solve your issue.

Regards,
Hari

The Transmission is likely shot. That year along with others had transmission defects. My new 2002 TLs died at 21k miles. I go to Acura for most all service and they gave me a $1500 discount on a tranny. It still cost me $3500.