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Author Topic: Buick 3.8 Transaxle shift help!!!  (Read 890 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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SBJeepn
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« Reply #37 on: April 03, 2019, 04:33:27 PM »

So big shout out of thanks to Lightbender for saving me from having to pull my transmission apart. 

Lots of troubleshooting and turns out the drivetrain is not from an 01 which is what I was told.  Its from an 04.  In 2003 they changed the transmission and pcm so they wouldnt communicate quite right. 

I havent verified for 100 percent but Have been told that with the new 04 pcm and new programming.  But for the first time I have some good hopes.  Sounds like we just need to refine the shift speed/rpm paramters for what we use it for and torque converter lockup and should be ready to roll to moab. 
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SBJeepn
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« Reply #38 on: April 04, 2019, 08:57:00 AM »

Verified it now shifts through the gears automatically.  Definitly need to refine the shift points but happy its working
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