Auto Trans Won't Downshift, Help!

silvergt2001 · Nov 27, 2005

Hey everyone, thanks for your time in advance.

Here's the problem:
Just installed 4.10's and I have been running the Diablo tuner. With the tune removed, all shifting/points/downshifts, etc. are fine. With the diablo OR factory HP tune installed the car will NOT downshift when in drive. It goes up to 3000 rpm and the trans pops as though it wants to shift but will not. If I turn overdrive off or shift manually everything is fine, it downshifts properly.

One sidenote: when I go in to adjust the TWO speedlimiters it will not allow me to turn off the second one.....After researching I think this is the problem.
Once again thank you and please help-I hate driving without the tune, it lags like a dog and the speedo is screwed!!!

OH-I have reset and reset and retuned and re-installed several times to no avail, diablosport says to call monday.

silvergt2001 · Nov 27, 2005

bump....anyone?

propellerhead · Nov 27, 2005

You have it covered. Call DiabloSport in the morning. I haven't heard of anything like that.

03ghoststang · Nov 27, 2005

i alos haven't heard anything like that before but you kinda answered you rown question in calling Diablo Sport in the morning

tomustang · Nov 27, 2005

Buy an SCT.

silvergt2001 · Nov 27, 2005

First off thanks for the feedback. Secondly, the weird thing about it is that I gave diablosport a call Friday at 1pm and spoke with someone, explaining my problem. I was given the "I'm sorry I don't handle cases in which our diablo tune is modified." I was like WTF??!! So he transferred me to another "tech", I explained the situation thoroughly and after 2 seconds on reflection socrates tells me that I have likely changed my tire size and that if I modified the tune there could be "confused status" in the tuner. I got a good laugh. He then told me he would like me to call back monday when a more qualified tech would be able to research my situation further, and I couldn't have agreed more.

Anyway I just wanted to see if anyone had ran into this. I'm going to disconnect the batt. and reset the tuner again and see if I can frustrate myself a little more.

tomustang · Nov 27, 2005

Sounds like diablo's retarded tech support

BTW those idiots ONLY visit the S197 section.

98blackmagic · Nov 27, 2005

silvergt2001 said:
First off thanks for the feedback. Secondly, the weird thing about it is that I gave diablosport a call Friday at 1pm and spoke with someone, explaining my problem. I was given the "I'm sorry I don't handle cases in which our diablo tune is modified." I was like WTF??!! So he transferred me to another "tech", I explained the situation thoroughly and after 2 seconds on reflection socrates tells me that I have likely changed my tire size and that if I modified the tune there could be "confused status" in the tuner. I got a good laugh. He then told me he would like me to call back monday when a more qualified tech would be able to research my situation further, and I couldn't have agreed more.

Anyway I just wanted to see if anyone had ran into this. I'm going to disconnect the batt. and reset the tuner again and see if I can frustrate myself a little more.

Hmmm doesn't sound like a company I would want to do busniess with, much less count on for good technical assistance.

joshheat25 · Nov 27, 2005

That is why you buy SCT! and Definately the tuner!

propellerhead · Nov 28, 2005

Try posting your issue on ModularFords.com. They have a Diablosport tech support forum there. One of the employees posts there. I've had much better responses there than going directly to Diablosport.

Dark Knight GT · Nov 28, 2005

I agree with Propellerhead about talking to another represenative over at Modular Depot. Also, if the o/d band will not disengage, and allow for a downshift, then the something involving the o/d servo exhuast feature isn't working as it should. If I'm not mistaken, the computer must facilitate a "signal" sort of to speak in order for the o/d band to exhuast and allow for a downshift. If the programmer has somehow disabled this function, that would explain it. It sounds like a faulty program for the o/d setup, and not something to do with entering in the wrong tire size. If you had entered in the wrong tire size, then all of your shifts would most likely be off, and not just the o/d exhuast/ shift down feature.

propellerhead · Nov 28, 2005

Dark Knight GT said:
I agree with Propellerhead about talking to another represenative over at Modular Depot. Also, if the o/d band will not disengage, and allow for a downshift, then the something involving the o/d servo exhuast feature isn't working as it should. If I'm not mistaken, the computer must facilitate a "signal" sort of to speak in order for the o/d band to exhuast and allow for a downshift. If the programmer has somehow disabled this function, that would explain it. It sounds like a faulty program for the o/d setup, and not something to do with entering in the wrong tire size. If you had entered in the wrong tire size, then all of your shifts would most likely be off, and not just the o/d exhuast/ shift down feature.

ModularFords.com, not Modular Depot. Modular Depot is sponsored by SCT and they ignore any DiabloSport questions over there. Modular Fords is sponsored by both so you get a more fair playing field.

Dark Knight GT · Nov 28, 2005

propellerhead said:
ModularFords.com, not Modular Depot. Modular Depot is sponsored by SCT and they ignore any DiabloSport questions over there. Modular Fords is sponsored by both so you get a more fair playing field.

Ooops. My mistake. Thanks for the correction. I didn't even know about ModularFords.com until you just now informed me.

Outlaw97GT · Nov 28, 2005

Any luck today bro?

Oh and thanks for the shims.....

silvergt2001 · Dec 5, 2005

sorry it took so long to reply to this, but anyway...
problem is fixed, I talked to another rep he walked me through a "reset" of the tuner which worked until I began to modify the diablo tune-I then spent a hour or so and narrowed it down to the shift points...I can't set my 1-2 shift below 5500 rpm's or it will do this. weird, huh?

oh and thanks again for the help everyone.

propellerhead · Dec 6, 2005

silvergt2001 said:
sorry it took so long to reply to this, but anyway...
problem is fixed, I talked to another rep he walked me through a "reset" of the tuner which worked until I began to modify the diablo tune-I then spent a hour or so and narrowed it down to the shift points...I can't set my 1-2 shift below 5500 rpm's or it will do this. weird, huh?

oh and thanks again for the help everyone.

You probably had it low enough to conflict with the downshift point.

Auto Trans Won't Downshift, Help!

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