Pre-Power Stroke Diesel (7.3L IDI & 6.9L) Diesel Topics Only

transmission not down shifting right

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  #16  
Old 09-10-2011, 09:18 AM
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Ok I tested the tps and it is good and I replaced the mlps and it is still doing it but atleast now the needle on my dash lines up with where it is since the new sensor is a lot tighter any more ideas I kinda need it now I layed my harley over yesterday in the rain and its not rideable so I don't have a back up
 
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Old 09-10-2011, 11:30 PM
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Is your windshield leaking around the drivers side area?


Might sound silly, but i've heard abit to many times, and especially on Fords, windows LOVE leaking and causes this problem.

The windshield leaks right on the tranny computer witch is located in the drivers side kick panel, and can sometimes make the E4OD act funny.
 
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Old 09-11-2011, 10:39 PM
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I will check it thanks and what if I did a filter change would that possibly help and the wierdest thing is that it works perfect with nice firm shifts when I am pulling the trailer and is only messing up empty maybe it is just a coincidence
 
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Old 09-12-2011, 08:48 PM
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I checked behind the kick panel and didn't see it is it up under the steel that holds up the dash
 
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Old 09-13-2011, 11:36 AM
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what is your tps set at?
 
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Old 09-14-2011, 09:02 AM
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I didn't check it on the truck i checked to to see if it was sweepeing I don't have a dvom at home so i checked it at work oh and the past two days it has been shifting great I have a trans temp gauge and it ranges from 180-380 how hot should it be getting most of the time it dosen't even get to 180 but when it dose it gets up to about 225
 
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Old 09-27-2011, 05:38 PM
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Ok so I just read the codes cuz the rabs light came on and here is what I got Tps out of range code 23, speed sensor which I replaced a week ago code 29, Converter clutch error code 62 which I figured was from it slipping, Electronic Pressure Control code 99
 
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Old 09-27-2011, 05:53 PM
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code 23= did you hold the throttle pedal to the floor for the test? if not that is what the code is.
 
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Old 09-27-2011, 05:59 PM
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well the code 23 came up on the engine off test
 
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Old 09-27-2011, 10:25 PM
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Originally Posted by ihf-350
I didn't check it on the truck i checked to to see if it was sweepeing I don't have a dvom at home so i checked it at work oh and the past two days it has been shifting great I have a trans temp gauge and it ranges from 180-380 how hot should it be getting most of the time it dosen't even get to 180 but when it dose it gets up to about 225
TPS;

ok,you NEED to set the tps properly when you instal it.otherwise the trans will act seriously wrong.

measure the voltage @ the center wire with the key on,and engine off.
hold the throttle wide open.loosen the nuts and spin the sensor so you get at least 3.8 V and more than 4.3V.
now let off the throttle and adjust so you have 1.05 min and 1.1 max.
double check that the WOT is still in range after tweaking.adjust as needed.
take her for a drive.
if you see she's downshifting a bit too early for ya,raise the voltage from 1.05 upward to like 1.07 and double check the WOT.
continue adjusting like this,making sure she stays within range,until you have her setup perfect for you and your truck.
take your time,getting it perfect is worth it.
i have mine set more towards the higher voltage so she doesn't cry 3rd at every ant hill. but not so high that she wants to lug either.by the time she does ask for 3rd though.......she means it. pre-hill with a load,if i hit it,she's downshifting no questions asked.experiment and tweak.just stay within range.i went a little high to hold OD a bit longer for fuel economy purposes.yet,not so high that i need to use the cancel button either (well,fine line almost sometimes depending on hill/load and how picky i feel like getting for fuel economy.)
you'll get the idea soon enough.

..........
trans temp;

ok,i trust that 180-380 was a typo? you didn't really see 380 or even 280 did you?
where did you place the sensor? the tans test port? do you have an external cooler?

trans temps roughly @ the pan/e40ds test port;
150 minimum.
175 ideally.
200 max.
200 - 250 short bursts is ok,but not preferred.best to add enough cooler(with fan if required) so this never,or at least rarely happens.
if it does happen a few times,count on changing the fluid every 15 -20k miles max.

nice chart here (which pretty much confirms against all other basic trans fluid/trans flush interval research iv done.)
http://www.digi-panel.com/trannyoil.htm
 
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Old 09-27-2011, 11:19 PM
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F250 is the trans computer behind the driver's kick panel? I thought it was behind the glovebox? If its not, what is that little black box with all them wires running to it behind the glove box in both my trucks?
 
  #27  
Old 09-28-2011, 06:43 AM
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Originally Posted by LSO1123
F250 is the trans computer behind the driver's kick panel? I thought it was behind the glovebox? If its not, what is that little black box with all them wires running to it behind the glove box in both my trucks?
It is probly the abs computer.
ABS Computer? - Oilburners.net

look at the pics of the wiring and the last one is of the abs computer behind the glovebox.....
No Heat - Page 2 - Oilburners.net
 
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Old 09-28-2011, 09:21 AM
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Yep that's it! All this time I thought that was the trans computer! Without this forum I would be completely uneducated!! Lol
 
  #29  
Old 09-28-2011, 08:07 PM
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the trans computer is easy to find.it's located in the engine bay on the firewall.at least the connector to it.i guess it probably is actually bolted inside behind the drivers kick panel if you had to replace it yeah.
anyway,it sports a 10 mm size bolt right in the center of the harness.look way down in beside the drivers front fender/brake booster and you'll see it.
 
  #30  
Old 09-28-2011, 09:31 PM
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The temps where not a typo the gauge says trans temp on it and it was on the truck when I got it and it is shifting alot better now after the tps sensor
 


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