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Discussion Starter #1 (Edited)
ok this is really weird!!

when the car is cold it shifts fine.

when its hot it doesn't want to shift when u take off it feels like it drops off the rpm goes up really high and then shoots forward, when coming to a stop the tranny feels again likes it thumoing or it stops and pushes you forward.

tranny service was done!!

when shifting in manual mode, nothing!! works just fine, no slipping.

NOW here is the kicker!!

when the ac is running nice and cold, the car shifts perfect!!! no slipping, no thumoing when coming to a stop!! nothing!!!


seems like when the ac is running its cooling something thats getter hot
 

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Seems like I have similar symptoms.

The transmission sleeps between 1st and 2nd gear - during the shift the engine revvs up and then the gear kicks in and the car jerks.

It happens often on a hot transmission - never on cold.

It happens more often on OD, rather then just on D. (more often when you get into a town after driving over highway)

It is worse at mid-acceleration - I can avoid the problem by accelerating slowly with gas pedal just slightly depressed or hard acceleration.

It does not seem the problem gets worse - it is about the same as 5 years ago and 50k back.

Any thoughts?
 

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sluggish 1-2

Seems like I have similar symptoms.

The transmission sleeps between 1st and 2nd gear - during the shift the engine revvs up and then the gear kicks in and the car jerks.

It happens often on a hot transmission - never on cold.

It happens more often on OD, rather then just on D. (more often when you get into a town after driving over highway)

It is worse at mid-acceleration - I can avoid the problem by accelerating slowly with gas pedal just slightly depressed or hard acceleration.

It does not seem the problem gets worse - it is about the same as 5 years ago and 50k back.

Any thoughts?
My '01 with 111K was getting sluggish 1-2 under light throttle. I changed the filter, and fluid with Mercon V. Few days later sucked 7Q out with my vacuum jar and added back 7Q Mercon V. I am about 75% new, 25% old.

Shifting is noticably sharper in all gears, but the dragging 1-2 is GONE!

This is a utility car, local use so I do not keep it up really well, just when it calls for someting. I was quite surprised at the difference.

-chart-
 

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1-2 shift neutralizing when hot

At about 100k my 2000 started nuetralizing intermitently when the trans gets warm. Back when I used to work at a dealership I tore it down and found that the 1-2 shift accumulator piston felt loose in it's bore especially when compared to the others. Because I am cheap I did not replace the piston and accumulator body. I put a new seal on the piston, it felt great. Put the trans back together, trans worked great. About 9 months later it started doing it agian. I only work 6 miles from the house so it rarely gets warm enough. Add this to the fact that I'm cheap and I never tore it back down. It now has 212k.
 

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OMG! Replacing PCV valve solved my shifting problem, which hunted me for years!
The PCV valve can do all kinds of harm, including ruining the engine.

Exhaust gas pass into the crankcase all the time. That contains water and other stuff like sulfuric acid. That vapor needs to be sucked out and put back through the engine and burned. The engine flow measurement of air is programmed to have the correct metered amount of air though the crankcase. If the PCV does not do the right thing, the engine tuning is off. As well it if plugs, or the hose collapses then all that exhaust with it's water is trapped inside the engine, and you have dirty water in your oil. And some acid.

Cheap part, some are hard to replace, others are a few minutes.

Just because it rattles, does not mean it meters correctly or does not stick.

-chart-
 

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My '01 with 111K was getting sluggish 1-2 under light throttle. I changed the filter, and fluid with Mercon V. Few days later sucked 7Q out with my vacuum jar and added back 7Q Mercon V. I am about 75% new, 25% old.

Shifting is noticably sharper in all gears, but the dragging 1-2 is GONE!
changing filter and transfluid (did it twice for the period I owned the car) never did any difference in my case.
 

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Discussion Starter #11
OK so its been two months now? it was the speed sensor in my car, replaced and shifts like its brand new!!!! 60 bucks!!! WOOW
 

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Discussion Starter #12
My '01 with 111K was getting sluggish 1-2 under light throttle. I changed the filter, and fluid with Mercon V. Few days later sucked 7Q out with my vacuum jar and added back 7Q Mercon V. I am about 75% new, 25% old.

Shifting is noticably sharper in all gears, but the dragging 1-2 is GONE!

This is a utility car, local use so I do not keep it up really well, just when it calls for someting. I was quite surprised at the difference.

-chart-

its the speed sensor, i had mr transmission do a test on the car while driving, seems the sensor wanted to shift at 9 mph and the computer told it to do it at 20mph, new sensor and YAY shifts like new!!!
 

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I have a 2003 SES DOHC and it had two occasions about 600 miles apart where it didn't shift correctly from 1st to 2nd. It was like others have said, where it went to neutral then shifted. Fortunately I let off the throttle before the "hard shift" like others have mentioned. Both times the vehicle was hot. So after finding this thread I decided to try the VSS. I ended up buying one from NAPA since the ones from Advance had bad reviews. I have had good luck before with Echlin parts. Be aware that there are two different models of this part depending on the transmission (count your pan bolts to determine if you have a 17 or 19 bolt pan).

The part is "hidden" behind and below the header pipe on the back of the engine near the firewall. Also you can't really see the connector. I couldn't figure out how to change it out. After looking on line I saw the procedure involves removing the tire, inner fender liner, alternator, crankshaft pulley, etc.. I decided I didn't want to do all this and went at it a different way. So this is why I am writing this post. I jacked the car up and put it on stands. I turned the wheels to the right. I went under the car and with my left arm went through the axle opening and with my right arm went between the transmission and firewall. Feeling for the connector I was able to press the tab and pull it apart. I could not get to the sensor bolt from below so back to the top I went.
I removed the jack stand on the passenger side and lowered that side of the car a bit so I could reach over the fender. Basically laying over the engine and using my left arm with an 8mm 1/4in socket and very small ratchet I was able feel for the bolt that holds the sensor cover on. Then I pulled my arm out and went back in with a stubby flat blade screwdriver. By gently prying while twisting on the sensor it popped out.
Then put a little transmission fluid on the new sensor's o-ring and jack the car back up. From underneath I found I could drop the new sensor into the hole much easier than from above. I then, when back on top and twisted and pushed the sensor back into the hole. I replaced the cover. Then from below again, I reconnected the connector. Note: I reused the metal clip from the old wire.

So far its been 1500+ miles and its shifting very smooth now. I am hoping this have corrected the problem but only time will tell.

Some notes about the car: The transmission was rebuilt 45000 miles ago (when the car had 124000 on it) and I changed the filter and fluid about 9000 miles ago. Prior to the transmission rebuild I had the fluid changed every 36000 miles by a shop that used a fluid transfer machine and MercronV fluid. The part that broke in mine was a piece of steel that hold one of the valves in place. A $3 part for a $1500 repair. While apart they put in new bands, clutches, and torque convertor.

Hope this helps someone tackle this job since it cost me about $45 for the part.
 

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OK so its been two months now? it was the speed sensor in my car, replaced and shifts like its brand new!!!! 60 bucks!!! WOOW
What part number was that? I tried replacing the (Dorman) 917-657 VSS, and it hasn't helped... I understand the Taurus has several different speed sensors... Thanks!
 

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I have a 2007 SE with 119,000 miles on it. A month ago the transmission started occasionally kicking between 25-40 MPH, when I accelerate off a stop. Only when the engine/transmission is hot. I've since noticed that it does it much more after I've been highway driving with the AC on. I live in Phoenix where it was 110 degeees yesterday. I've changed the speed sensor and the neutral safety switch and the PCV valve. I've had the fluid and filter changed in the transmission. But it still does it. Any ideas what I might try next? Is there a way for me to cool the transmission? I'm reluctant to do a transmission rebuild on a 2007 car with 119,000 on it. Thanks for all advice!
 

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Woohoo! I think I solved it -- I had a transmission oil cooler installed in front of the radiator. $60 at Autozone for the part. Drove the car 50 miles yesterday on the highway in 105 degree heat, then had to stop at lights several times on the way home. Smooth shifted every time. Tried it again today -- same thing. If it starts kicking again, I'll update this post, but so far so good!
 
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