2000 Mustang trans. problems. VSS, NSS, trans control solenoid?
My wifes 2000 Mustang automatic, recently began having trans. problems... again. It will not engage in reverse unless you give it throttle, but it does'nt seem to be slipping, When decelerating, i.e. letting off the throttle, it seems to be mis-shifting i.e. jumping. When accelerating in forward everything seems to be fine. Also, the engine seems to get hot quickly, tho the temp gauge reads fine, and seems to be working. I have done some research, and it seems the most likely culprits would be the transmission control solenoid, the neutral safety switch, or the vehical speed sensor. Does this car acctually have a physical linkage, or is it all electonic? Can I have it dyno'd at anyplace that has a dyno computer, or do I need to go to a ford dealership? Thanks ahead of time for your reply, money is an issue, so if someone can help it would be much appreciated.
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Re: 2000 Mustang trans. problems. VSS, NSS, trans control...
If your engine is getting hot, check your radiator for transmission fluid; the radiator has a small heat exchanger that cools the transmission fluid it is located inside the radiator bottom; the transmission lines attach there; also, the leak into the radiator of transmission fluid can "starve" the transmission causing delay in shifting, slipping and, more throttle being needed to engage and, shift.
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I never actually did any auto trans repair when I was a dealer tech,but I do believe you're looking at a broken reverse sprag(this is probably gonna require a removal and disassemble of trans)I will admit<Aamco did a pretty good job on my 98 Voyager(I didn't have a lift in my home shop at the time,plus I figured out renting another car for my wife to drive would have made my costs about the same).The quickest solution for the average do it yourselfer is probably a Jasper rebuilt unit.(The special tools aint worth buying unless you plan to do a LOT of transmission rebuilds)
sounds like filter could be clogged, if it hasn't been changed in a while. you can try to replace throttle position sencer, it is like your old trans kinkenge system, only now, it is elect. it tells trans when to shift, like your speed sencer on trans doe's. both can make it act like it is.
I would begin by replacing the filter if its not new, 2 possibility of issue, faulty shifting module or defective transmission rebuilt. just because it has been rebuilt does not mean the individual work on it did a good job. the less cost effective way is to locate used modulator from ebay or junk yard, if that does not rectified the issue than more likely it will be the tranny. the bad part is that I dont know of a company offer a bench test for the tranny modulator.
What kind of noise? A clunk, chatter, whir, grinding, or what? If it's a clunk, you may have a worn U-joint. Test by holding brake on and change between drive and reverse and back. If you hear a "clunk" when the tranny engages, it's probably a worn U-joint. Not a hard repair to do in the driveway. Always change BOTH front and rear U-joints - if one's worn, so's the other.
Your going to have to take to a transmission shop and have the blazer scanned for the problem, You could have a broken sun gear which is common or I have also personally seen/fixed a 99 4L60E that had a broken reverse servo piston,it is the piece that engages the low/reverse band under a cover in the valve body area,a piston with a band engagement pin. Anyone that has this problem can have it repaired in the vehicle,its worth checking BEFORE replacing the trans unless the fluid is burn't or there are other symptoms present. Good luck and hope this helps. keep me posted, be glad to help.
yes, you probably got water in the TPS, Throttle Position Sensor, mounted on the throttle body. It has a huge affect on trans shifting. Remove the electrical connector and dry it with a hair dryer on low heat. Never pressure wash an engine compartment. Too many sensitive electronic parts these days.
Throttle Position (TP) Sensor
The throttle position sensor (TP sensor) (9B989):
Is a potentiometer.
Provides a signal to the powertrain control module (PCM) (12A650) which is directly proportional to the throttle plate position.
Is mounted to the throttle body (9E926) and engages the throttle plate shaft.
After a good deal of research and several shops suggesting a rebuild of the transmission, I decided to have the trans fluid and filters changed before doing anything. It was a tough call because it could have been a waste of $125. As soon as the spin off filter was removed you could see it was blocked. So the hydraulic pressure in the system was way down, still enough to engage reverse and enough to work all the shifts, but not enough to engage forward without a slight tap on the accelerator.
My Subaru has 240 000 km on it and I suppose the clutch pack rebuild wouldn't hurt, but as it is now it engages quickly and shifts up are noticeably smoother.
May not be the solution for every case, but it solved my situation.