2001 Ford Taurus Transmission shifting Rough / Hard - Inter

Tiny
AB_SOOD
  • MEMBER
  • 2001 FORD TAURUS
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 63,000 MILES
Hi,

My Ford Taurus 2001, with 63K is having the intermittent problem of Rough / Hard shifting.

Normally the transmission shifts good, but there are days, when in bangs into each gear, especially while shifting from 1 -> 2 and 2 -> 3, and sometimes the down-shift 3 -> 2 happens with a bang(when coming to stop).

It do this for few days, and gets back to normal shifting, on its own. When it shift rough, it shifts rough all the time, irrespective of the fluid being Cold or Hot.

After few days the problem dis-appears completely, and it shifts normally. Again after a month or two, it ACTS up for a week, and get normal.

I got the codes read for the engine and transmission, there are no codes present, and the check engine and transmission lights NOT ON.

The shop says there is no problem with the sensors and solenoids, and there is something internally wrong. And I believe that if there is some mechanical problem, it will happen all the time, and not intermittently. So, I guess its some electrical problem.

But all the electricals are working fine. The speedo meter doesn't flicker, and the cruze control works fine. All the electricals - radio, power windows etc works fine.

Abhi
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Wednesday, February 25th, 2009 AT 3:49 PM

5 Replies

Tiny
JGAROFALO
  • MEMBER
This sounds like your EPC solenoid or pressure regulator valve is sticking. This solenoid controls the hydraulic pressure within the transmisison's hydraulic system. When it fails, the pressure will default to the max pressure to protect the transmission. The absence of trouble codes indicates that it is mechanically sticking while being electrically correct.
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Saturday, February 28th, 2009 AT 7:42 PM
Tiny
AB_SOOD
  • MEMBER
Thanks for the reply !

Should the transmission flush help in resolving the problem?

The problem started after I added Slick 50, to the transmission in Nov 2008. This was a thick solution(like Jelly), can this make the valves stick?

But the problem is intermittent. Like few days in a month, and after that it becomes normal.

I added the SeaFoam trans tune to Tranny to loosen any sticky valves(Jan 2009). And after that have driven it for 1000 miles, all short trips no more than 35 miles.
It didn't seems to help.

What else can be done to resolve it?

I appreciate your help and support.
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Sunday, March 1st, 2009 AT 10:43 AM
Tiny
JGAROFALO
  • MEMBER
I'm not a fan of any additives to a transmission. For the most part, there is always the potential for chemical compounds in additives reacting unfavorably with compounds in the transmission oil. Transmission flushing is another that I question. Having disassembled and overhauled MANY transmissions in my lifetime, I cannot see how anything can flush out oil contained in drums and servoes.

But. Enough on my soapbox.

You say that the slick 50 was the beginning of the problem. There is a possibility that it could have contributed to the problem. There is also the possibility that it could simply be a coincidence. I might also suggest that there could be a connection along the way that may have built up some resistance (from age or corrosion). Sometimes. All it takes is unplugging the connectors and plugging them back in to solve a pesky electrical problem. Note that the main electrical connector on the transmission is almost directly under the battery box and battery. Check this connector on the top of the transmission for corrosion. A little resistance in a connection can be enough to affect the operation of the transmission without setting a trouble code. Otherwise, the next thing to do is to try cleaning or replacing the solenoid or removing the valve body and cleaning it out.
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Sunday, March 1st, 2009 AT 7:22 PM
Tiny
AB_SOOD
  • MEMBER
Thanks for the comments.
I can check the electrical connectors, and clean them.

For the valve and solenoids. Is it a good idea if I run full can of SeaFoam Trans Tune, its known to clear any sticky valves, gum and varnish.

And after the seafoam treatment, I can drop the pan and change the filter.

My understanding is that the detergents in the new fluid, will help clean any sticky valves, and the interior of Tranny. Am I right at thinking so?
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Sunday, March 1st, 2009 AT 7:33 PM
Tiny
ANTIGAS
  • MEMBER
Additives to a transmission is a no no You use certain types of tranny fluid for a reason. Additives are scams.
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Wednesday, May 4th, 2011 AT 10:55 PM

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