93_SHO_off
New Member
my 93 down-shifts real hard at 60 mph. I don't know if it is the tranny or the pcm. I heard that the pcm in those has to be re-calibrated or replaced. any one had a similar problem?
Really harsh down shift on my 93 atx
- Thread starter 93_SHO_off
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Chris Benvie
Every so often
Well 1st off this is indicative of slamming on the gas pedal and hurting on the tranny.
2ndly, mileage? Tranny rebuild ever? This kind of stuff helps us out.
BTW, welcome to SHOforum.com, your virtual garage of SHO help.
2ndly, mileage? Tranny rebuild ever? This kind of stuff helps us out.
BTW, welcome to SHOforum.com, your virtual garage of SHO help.
93_SHO_off
New Member
Thanks for the welcome. yeah that usually happens when I mat the gas. 2nd, the car has about 140k. the tranny came out of a car with 160k, but was supposed to only have about 60k on it. I will never buy another used tranny again. I read on all-data about the pcm not being calibrated right and my car has all the symptoms of that. but atx's are really bad with trannys.
Chris Benvie
Every so often
well unfortunately your car is a 93, the worst year for the ATX tranny. My suggestion to you would be to buy a D4U1 ECU, TedB LPM and have your tranny fluid flushed and replace it with some type of synthetic fluid.
Chances are if it is your ECU this should help. Otherwise it could be tranny rebuild time.
Do a search for the D4U1 computer here using the search function, this has been gone over and over again about the improvements it has.
You can get this upgrade from mikey at www.midwestSHO.com
Chances are if it is your ECU this should help. Otherwise it could be tranny rebuild time.
Do a search for the D4U1 computer here using the search function, this has been gone over and over again about the improvements it has.
You can get this upgrade from mikey at www.midwestSHO.com
Mike Kopstain
New Member
Chris Benvie said:
Not really. At 60mph light acceleration will cause a downshift.
The problem is common with the ATX and very common with a 93'. It's your torque converter unlocking.
Before you buy any parts, from me or from anyone, run the codes and see if you get any 6xx codes. These pertain to the tranny and though their presence is unlikely, the few times they do show up they greatly aid in diagnosis.
Secondly, verify that both your motormounts and subframe bushings are not worn. Either of these will cause the conditions described.
93_SHO_off
New Member
when I check codes, should I check koer, koeo. also, it's not motormounts becauase the car revs like its in nuetral and slams into gear. i've only done that once or twice on accident. and cris is right it only happens when I mash the gas. Its like the car wants to downshift twice the firts shift into 3rd is ok but into second is painful.
93_SHO_off
New Member
Ok, I ran codes koeo and got these codes. 636, a tranny code, 327, and 519. can anyone tell me what they are?
the on going reality of shopower
trans mech
hey check for TPS I had that 2 weeks ago.
makes car idle hi. Causes it to slam in gear and down shift hard.
I'm a Transmission Builder up here in Canada. I own a 93 SHO ATX
makes car idle hi. Causes it to slam in gear and down shift hard.
I'm a Transmission Builder up here in Canada. I own a 93 SHO ATX
93_SHO_off
New Member
Thanks sho power, would the tps make the car kick out of od too? I can be cruisin 60 and let off the gas a little bit and the rpms go up like the car kiked out of overdrive. Thanks ahead for any input.
the on going reality of shopower
trans mech
it is coming out of Lock-up
it acts like a fifth gear. Comes off when no thottle and when you press gas
moderatly. lock up goes like this 1-2-3 Lock-up 4. On light driving
1-2-3lock-up-4Lock-up on heavy driving.
it acts like a fifth gear. Comes off when no thottle and when you press gas
moderatly. lock up goes like this 1-2-3 Lock-up 4. On light driving
1-2-3lock-up-4Lock-up on heavy driving.
93_SHO_off
New Member
did the tps trip any codes, because I don't have a tps code coming up?
the on going reality of shopower
trans mech
yes had one code
but cleared it and still did the same thing so i changed it
some things are weird that way. You just got to now the cars to now what to change. I worked on thousands of taurus's every year at work so i now the ford computers and electronics well.
but cleared it and still did the same thing so i changed it
some things are weird that way. You just got to now the cars to now what to change. I worked on thousands of taurus's every year at work so i now the ford computers and electronics well.
Mike Kopstain
New Member
93_SHO_off said:
This is something you didn't mention. If the engine revs then catches, the transmission is slipping. You will need a rebuild in short order.
Axianator
I am a banana!
Unfortunately, 93_SH
ff, I have to agree with Mr. Kopstain's comments on this. Mike Evans is correct about the converter unlocking when you take your foot off the gas (all Gen 2 ATX's will do this under the factory programming), but I don't think the TPS is to blame here. Out of curiosity, did you have a chance to check your codes? If the problem isn't sensor-related (eg. VSS or TSS), then I'd tend to think that worn friction materials (clutches, et al) were to blame for the kickdown runaways you describe.
ff, I have to agree with Mr. Kopstain's comments on this. Mike Evans is correct about the converter unlocking when you take your foot off the gas (all Gen 2 ATX's will do this under the factory programming), but I don't think the TPS is to blame here. Out of curiosity, did you have a chance to check your codes? If the problem isn't sensor-related (eg. VSS or TSS), then I'd tend to think that worn friction materials (clutches, et al) were to blame for the kickdown runaways you describe.93_SHO_off
New Member
yes, I checked codes and there were no tps codes so I think that my original theory of a bad trans was correct. thanks for all the help guys.
