Lost Automatic 2nd gear - TCCoA Forums
 
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post #1 of 7 (permalink) Old 03-29-2017, 03:29 PM Thread Starter
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Lost Automatic 2nd gear

Ok guys need some ideas. 03 Mercury Marauder 4r75w. Trans won't shift auto(shifter in drive)to 2nd gear. If I take off in D the computer commands 2nd but stays in first(does not slip like the clutch pack is fried or just not engaging) until I get going fast enough then it will shift to 3rd at the proper MPH. No codes.

I have logged the solenoids being commanded properly, swapped out the solenoids, swapped out the OSS, replaced the filter, made sure VB was torqued properly, checked continuity of the hard connector. Disconnected the main plug outside the trans which should have both solenoids off and default to 2nd gear which it does so I don't believe the clutch pack is fried.

I'm stumped and so are a couple others. Just trying to see if there is anything else I can check before I pull the trans apart.

1995 SC------------------1994 SC----------------1993 LX
Black----------------------Red----------------------Grey
3.8-------------------------3.8w/bent rod---------5.0
4R70W--------------------M5R2--------------------AOD
2.4 AR in works---------2.0 Auto Rotor---------N/A
24psi----------------------15+----------------------none yet
450RWHP----------------322RWHP -------------who knows/who cares
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post #2 of 7 (permalink) Old 03-29-2017, 05:27 PM
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Can you measure voltage on the pins for the solenoids at the trans connector as it commands the shifts to see what the PCM is actually feeding them?

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post #3 of 7 (permalink) Old 03-29-2017, 07:36 PM Thread Starter
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Yeah I gotta try that.

1995 SC------------------1994 SC----------------1993 LX
Black----------------------Red----------------------Grey
3.8-------------------------3.8w/bent rod---------5.0
4R70W--------------------M5R2--------------------AOD
2.4 AR in works---------2.0 Auto Rotor---------N/A
24psi----------------------15+----------------------none yet
450RWHP----------------322RWHP -------------who knows/who cares
[email protected]@[email protected]
BLOWN38 is offline  
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post #4 of 7 (permalink) Old 03-30-2017, 07:33 AM
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So what happens if you just totally unplug the transmission connector and try to drive the vehicle? 2nd gear is the default for electrical failure, so this would tell you better than me just saying that it isn't electrical that it isn't electrical.

D

01 F150 5.4L 4x4 and a 98 Mustang GT vert sitting engineless and without transmission or converter


All my vehicles tuned by BC Automotive (me)

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post #5 of 7 (permalink) Old 03-30-2017, 09:22 AM Thread Starter
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If I unplug the external harness it acts like it is in 2nd gear, its not snappy like 1st at slow speeds, acts the same as manual 2nd except for maybe the engine braking part of manual 2nd. Reverse also works while harness is unplugged.

Also my trans guy uses transgo kits. So there is some wacky things going on in there. I think I am going to build it myself when it needs it, this time.

It has extra clutches, don't remember the counts. And I believe trans guy uses ALto and raybestos clutches.

Thanks

1995 SC------------------1994 SC----------------1993 LX
Black----------------------Red----------------------Grey
3.8-------------------------3.8w/bent rod---------5.0
4R70W--------------------M5R2--------------------AOD
2.4 AR in works---------2.0 Auto Rotor---------N/A
24psi----------------------15+----------------------none yet
450RWHP----------------322RWHP -------------who knows/who cares
[email protected]@[email protected]
BLOWN38 is offline  
post #6 of 7 (permalink) Old 03-30-2017, 06:14 PM
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Perfect. So it's not electrical. It's most likely in the valve body or accumulator.

D

01 F150 5.4L 4x4 and a 98 Mustang GT vert sitting engineless and without transmission or converter


All my vehicles tuned by BC Automotive (me)

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post #7 of 7 (permalink) Old 03-30-2017, 08:33 PM Thread Starter
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Join Date: Jun 2003
Location: NOVA
Age: 42
Posts: 616
I did pull the accumulator while I had the pan off. Nothing jumped out at me there. The rubber seals weren't torn and no big hole in the metal body.

1995 SC------------------1994 SC----------------1993 LX
Black----------------------Red----------------------Grey
3.8-------------------------3.8w/bent rod---------5.0
4R70W--------------------M5R2--------------------AOD
2.4 AR in works---------2.0 Auto Rotor---------N/A
24psi----------------------15+----------------------none yet
450RWHP----------------322RWHP -------------who knows/who cares
[email protected]@[email protected]
BLOWN38 is offline  
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