what causes a trans to shift - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 06-27-2011, 05:10 AM Thread Starter
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what causes a trans to shift

Hey guys,I have had my truck in the Ford dealer for two weeks now because it sometimes won't shift into second gear,well they called me Friday and said something about a bad sensor behind the turbo that builds up pressure and makes the trans shift,is this a line of BS ? I have never heard of this.They want $500 to fix this and they want to pull the transmission.

1997 F-350 CC Dually Power Hungry performance chip. DIY air intake ,4" Diamond Eye exhaust, Trans temp gauge,Pyrometer gauge 10,000 Lb. Warn Winch, 1 million candle power auxilary lights,black heavy diamond plate bumper/brushguard
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post #2 of 16 Old 06-27-2011, 05:26 AM
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There's been a handful of times (like 5 or 6) since I bought my truck where I begin to accelerate and it won't shift into 2nd until I completely let off the gas. Of course, a majority of those have been under WOT, so it winds up reaalllll tight

I've never heard of this sensor before either, sounds like BS to me

1996 F250 7.3 PSD 4x4 - "Dally"
274k miles
It's got some go fast stuff
Sitting on 2006 F-350 axles and suspension

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post #3 of 16 Old 06-27-2011, 06:02 AM Thread Starter
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That is the way mine was acting,and when it won't shift into second if you push it, it will go in and out of gear really fast. But you are right when you let off the throttle most times it will shift into second.

1997 F-350 CC Dually Power Hungry performance chip. DIY air intake ,4" Diamond Eye exhaust, Trans temp gauge,Pyrometer gauge 10,000 Lb. Warn Winch, 1 million candle power auxilary lights,black heavy diamond plate bumper/brushguard
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post #4 of 16 Old 06-27-2011, 08:40 AM
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Mine would wind up good under hard accel almost red line so I let off it won't shift so I said screw it tried it again and shifted, I always thought the valve body shifted it tho

-Kris-
2000 excursion V10 2wd 230k
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post #5 of 16 Old 06-27-2011, 11:47 AM Thread Starter
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Someone on another forum told me a modulator valve changed gears in my truck and in later years the computer changed them

1997 F-350 CC Dually Power Hungry performance chip. DIY air intake ,4" Diamond Eye exhaust, Trans temp gauge,Pyrometer gauge 10,000 Lb. Warn Winch, 1 million candle power auxilary lights,black heavy diamond plate bumper/brushguard
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post #6 of 16 Old 06-27-2011, 01:09 PM
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didnt they stop using the e4od after 97? what would have it after that?

-Kris-
2000 excursion V10 2wd 230k
2000 Excursion 7.3 4x4 246k
1995 CCLB DRW 324K
2001 CCLB DRW 319K
Dp tuner infinity, exhaust, intake, chipped, tricked, and wrecked


Quote:
Originally Posted by marine5811
The stock downpipe in an OBS is flat because I'm a ginger.
Quote:
Originally Posted by alberta 7.3
Finding a decent woman is like shopping for a used truck. You spend most of your time picking through the money pits, wrecks, and basket cases until you find one that you can tolerate
Quote:
Originally Posted by JJFLASH
Well at least you caught the loose bolts before they cause any damage. Nothing worse than a sloppy hole
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post #7 of 16 Old 06-27-2011, 02:31 PM
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About the only "sensor behind the turbo" is the exhaust back pressure sensor; IIRC, there's a tube that goes from the exhaust to it, that sometimes gets clogged. This also affects the exhaust back pressure valve (EBPV); Idunno if the PCM also uses it to control the tranny. Wouldn't surprise me if it did. Does your truck sound like there's an exhaust restriction ("whoosh" sound in exhaust) when this happens?
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post #8 of 16 Old 06-27-2011, 06:47 PM
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TAKE IT TO A REPUTABLE TRANS SHOP!!!!

Okay i think i covered this in another post about your trans as well...

Shifting in the E4OD is completely controlled by the PCM. The PCM receives signal from the Shift Solenoids which measure pressures in the primary and intermediate VB's.

As far as a "sensor" behind the turbo, i am not sure about that. I think I call BS on that one. The last E4OD i had out in my buddies OBS 7.3 didn't have any sensors behind the Turbo that i can recall, certainly nothing that is plugged into the trans...

Also the E4OD ran in the OBS trucks until 97, after that it was called the
4R100. Pretty much the same trans...

_____________________________________________
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08 Axle/4x4 conversion, 5spd conversion, 6637, 5" SP exhaust, gearhead tunes
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post #9 of 16 Old 06-27-2011, 08:34 PM
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so whats in the e99-03 7.3L? those are all 4r100

-Kris-
2000 excursion V10 2wd 230k
2000 Excursion 7.3 4x4 246k
1995 CCLB DRW 324K
2001 CCLB DRW 319K
Dp tuner infinity, exhaust, intake, chipped, tricked, and wrecked


Quote:
Originally Posted by marine5811
The stock downpipe in an OBS is flat because I'm a ginger.
Quote:
Originally Posted by alberta 7.3
Finding a decent woman is like shopping for a used truck. You spend most of your time picking through the money pits, wrecks, and basket cases until you find one that you can tolerate
Quote:
Originally Posted by JJFLASH
Well at least you caught the loose bolts before they cause any damage. Nothing worse than a sloppy hole
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post #10 of 16 Old 06-27-2011, 08:38 PM
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No sensor behind tranny. Two issues i've seen are ethier no 2nd gear shift at WOT OR 1st right to 3rd.
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