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Author Topic: Buick 3.8 Transaxle shift help!!!  (Read 606 times)
TBItoy
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« Reply #25 on: March 15, 2019, 02:09:46 PM »

did it shift before you swapped PCMs?
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Nick Cooper - Dodson Branch, TN

Contact  -   EAT.SLEEP.WHEEL@GMAIL.COM
SBJeepn
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« Reply #26 on: March 15, 2019, 05:12:16 PM »

So I got Max 52mph at .73tps in second gear.  I think my to wants a way higher speed to upshift.  I know yellow with is the 2-3 solenoid in the harness. Maybe I can splice in a pig tail and ground it and see if it shifts up.   
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SBJeepn
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« Reply #27 on: March 16, 2019, 07:58:45 AM »

So I spliced into the solid yellow/blk wire with a spice connector and then grounded it to chasis.  It didn't appear to shift into third.  The obd reader didn't indicate a shift and didn't indicate turning the solenoid off.  But then again maybe it wouldn't indicate turning it off if it didn't call for it?!  

Did I do it correctly to manually initiate a shift?

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« Last Edit: March 17, 2019, 08:10:32 AM by SBJeepn » Logged
LightBnDr
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« Reply #28 on: March 17, 2019, 05:57:48 AM »

What's the solenoid command supposed to be during a 1-2 then a 2-3 shift ?

1-2 off 2-3 on ? Then 2-3 off and 1-2 on?

Asking because I'm wondering if the 2-3 is off during a 2-3 shift rather than on. Then you would just want to pull the pin from the harness to get a 2-3 shift

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SBJeepn
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« Reply #29 on: March 17, 2019, 06:40:24 AM »

2-3shift is solenoid a-off solenoid B-off

The fourth is a-on and b-off
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SBJeepn
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« Reply #30 on: March 17, 2019, 01:41:51 PM »

Is there a way to do any electrical testing prior to swapping out the solenoid?  IE> shouldnt some current come through the solenoid 2-3 wire that is intended to be grounded? 

Is it possible to have the plug in up side down?  I appears on the pic above the plug arrow and shift wire are on the bottom side, but I have it plugged in so the arrow is up, since it makes sense to me.  I do get trans temp and other data on the scan tool so I assume this isnt the case.  but hey gotta double check stupid...
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SBJeepn
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« Reply #31 on: March 17, 2019, 05:04:32 PM »

I came across a thread they said if you unplugged the harness from the tranny it would have help rule in or out the b solenoid because it will only run in third gear.  So I did this and it looks to have worked.  It looks like I'll be pulling the tranny apart this week
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LightBnDr
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« Reply #32 on: March 18, 2019, 10:11:30 AM »

Don't pull that trans apart yet. Stay with me goose
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SBJeepn
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« Reply #33 on: March 18, 2019, 02:23:56 PM »

Don't pull that trans apart yet. Stay with me goose

You were spot on and saved me hours of moving cross members.  It was in fact a computer issue, and the computer not breaking the circuit to turn off the solenoid.  I snipped the wire from the solenoid to the computer and it immediately shifted to third.   

Talked to the computer guy he is now on board that this is a computer issue and is going to burn me a new one to help differentiate if it is a defective computer or simply incorrect values for the trans to shift. 

With that wire bypassed I can now go a whopping 35 mph instead of 21 at redline.
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SBJeepn
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« Reply #34 on: March 18, 2019, 02:26:44 PM »

did it shift before you swapped PCMs?

Sorry I missed this.  I never got to test it with the other pcm, it was corrupt from the beginning and the engine wouldn't run. 
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ranger11
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« Reply #35 on: March 18, 2019, 02:47:43 PM »

Good info in here even though ill prob never need it.

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Ford screwed up by trying to get all ricer and add 13 cams and a bunch of valves to their v8s.
SBJeepn
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« Reply #36 on: March 18, 2019, 03:05:02 PM »

Good info in here even though ill prob never need it.

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For sure,  I spent probably 15 hours searching and reading on this and there isnt a lot of info, probably because there is a million reasons it can go wrong and most people just take it to a shop to get it done. 
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