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Old 11-20-2008, 12:03 AM   #1
richsaav
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Default Replaced valve body, now having shifting problems

I replaced the valve body on my 92 SL2, and now I'm having shifting problems. The valve body I purchased from transtar, and was wondering if I got a bad valvle body?

I started driving this morning and the shifting was getting better, then as I was slowing down it down-shifted really abruptly. Then it wouldn't shift out of first gear.

Any suggestions?
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Old 11-20-2008, 08:36 AM   #2
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Default Re: Replaced valve body, now having shifting problems

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Originally Posted by richsaav View Post
The valve body I purchased from transtar, and was wondering if I got a bad valvle body?
sounds like it.
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Old 11-20-2008, 11:33 AM   #3
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Default Re: Replaced valve body, now having shifting problems

Were the valve bodies identical? They used 2 designs and I belive 92 uses the old style, or was like a transition period between the 2 designs.
Did the old and new valvebody have 4 holes in like a diamond shape on the bottom?
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Old 11-20-2008, 12:36 PM   #4
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Default Re: Replaced valve body, now having shifting problems

Possible bad VB and or shift solenoid or you may need a new harness.
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Old 11-20-2008, 01:54 PM   #5
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Default Re: Replaced valve body, now having shifting problems

Where is the shift solenoid located? is it internal to the VB?
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Old 11-20-2008, 02:12 PM   #6
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Default Re: Replaced valve body, now having shifting problems

Yes the new valve body should have come with it. Is it a rebuilt vb or brand new?
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Old 11-20-2008, 02:17 PM   #7
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Default Re: Replaced valve body, now having shifting problems

I purchased a remanufactured VB from Transtar.
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Old 11-20-2008, 02:27 PM   #8
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Default Re: Replaced valve body, now having shifting problems

hmmm. I am sure you would have to be able to prove that one was bad before sending it back to get another one. Did it come with a new VB harness?
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Old 11-20-2008, 02:34 PM   #9
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Default Re: Replaced valve body, now having shifting problems

no, just the valve body, no harness. Is the VB harness easy to replace?

I just called Transtar, and they referred me to their supplier, VBX (Valve Body express). I'm waiting for call back.
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Old 11-20-2008, 02:50 PM   #10
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Default Re: Replaced valve body, now having shifting problems

Well considering you can do the valve body on your own th harness should not be too bad. There is a connector that goes to the case where the electical harness runs to, then the harness goes to the valve body... You had to of hooked it up to the VB when you replaced it. I personally do not know how to tell if a solenoid is bad, maybe if someone could chime in on that you could inspect the solenoids. I doubt its the harness. For now, I think I would focus on getting the other VB from the company. A harness is not unheard of, and its possible to mess it up I guess?? but not as likely as getting a faulty part. You won't know unless you look at it. But I would try to get the other VB from them so you are not doing all this work to find out that you need another VB and the harness is not messed up. The worse that can happen; is you get another one, and the original was fine. But you won't know til you get all greased up.
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Old 11-20-2008, 02:56 PM   #11
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Default Re: Replaced valve body, now having shifting problems

I just got a call from the VBX tech, and we went through the codes(14,16,18,22-24, and 43). He said to try clearing the codes, and if they get reset, it would sound to him like low line pressure, and I will get another VB. I'm going out for a while, so I disconnected the negative cable from the battery, and let it clear for a while. I'll respond back with the outcome.
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Old 11-20-2008, 03:34 PM   #12
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Default Re: Replaced valve body, now having shifting problems

Well good deal.
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Old 12-07-2008, 02:34 PM   #13
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Post Re: Replaced valve body, now having shifting problems

I have the VB and Transtar is replacing it under warranty, and I've disconnected the harness connector at the VB and its covered with fluid. Could t his be the reason for the shifting problems?

I'm going to continue replacing the VB.
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Old 12-07-2008, 03:18 PM   #14
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Default Re: Replaced valve body, now having shifting problems

That would be a real good place to start looking for the problem. Its not supposed to leak into the connector.
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Old 12-07-2008, 08:00 PM   #15
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Default Re: Replaced valve body, now having shifting problems

Did you lose the seal at the connector? It's suppose to slide onto the valve body before the pan goes back over it.

Also early 92's used the early design of the valve body and late 92's used the newer design. Make sure you have the right design for your car.
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Old 12-08-2008, 12:01 AM   #16
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Default Re: Replaced valve body, now having shifting problems

That, AND it takes the PCM some time to re-learn to shift the new valve body after it has been working with a bad one for a long time. Give it about 500 miles and around 10 cold re-starts and it should re-learn.
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Old 12-08-2008, 12:35 AM   #17
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Default Re: Replaced valve body, now having shifting problems

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That, AND it takes the PCM some time to re-learn to shift the new valve body after it has been working with a bad one for a long time. Give it about 500 miles and around 10 cold re-starts and it should re-learn.
That is true, but he mentioned it didn't shift out of first after a period of time. That's not part of the relearn.
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Old 12-08-2008, 12:45 PM   #18
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Default Re: Replaced valve body, now having shifting problems

Fluid in the harness could've been the problem. There should be a blue seal that slides around the harness under the valve body cover. If that is missing or damaged replace it before putting the cover back on.
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Old 12-08-2008, 08:17 PM   #19
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Default Re: Replaced valve body, now having shifting problems

Special Forces, you called it. I forgot to put the seal back on. It's shifting much better now. Thanks for all the input.
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