I have lost my over drive but only when warm FIXED!!!!!!!! - Page 6 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-27-2004, 08:31 PM   #51
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You guys know your stuff. I have not been able to put it on a scanner yet but I do have a question. Is the scanner pretty self explanatory or do you need allot of experience with it to get the info you guy'* are asking for? It seems to be able to go into OD and lock up even when it is not veary warm.
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Old 07-31-2004, 11:14 PM   #52
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Update:

Just spent the last hour driving my Bonn. with a scan tool connected.
I was able to make the car lock out of OD several times.
When you go over 50 mph the computer will call for lock up and the scan tool will say
ON and the % will be about 45-70 and then it will drop to 0%.
The slip will be -50 to -60 rpm. (moving around allot) is it suppose to be negative numbers? It will not lock you out of OD till you go slower then 50.
If you go slow and allow the TCC to lock it will say ON and the % will just flash 100% and the slip will be 190 or above and then it will lock OD out and you have to reset the computer by shutting off the car and restarting it. It happens very fast and it took a few times to confirm what it was doing. I hope this is the right information you guys asked for? One last thing can I swap the computer from the Buick Lasaber with my Bonn?

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Old 08-01-2004, 03:51 PM   #53
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jr's3800
So in your opinion what is happening could it be the synthetic transmission fluid?
Is it normal for the slip numbers to be negative.
Is it normal for it to say 0% when the TCC is locked up?
And why does it do only when you are going slower then 50 mph.?
Could it be a wrong gear ratio and if I swap the computer will that fix it?
Is it the torque converter?
I know it is allot of questions but I have to start some where.

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Old 08-02-2004, 01:27 PM   #54
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The LeSabre PCM may not work, and won't FULLY work. Different gear ratio.
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Old 08-02-2004, 02:15 PM   #55
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willwren and A Bonnie Canuck

Do you mean the problems I'm having are from the gear ratios being different?
What is your understanding on the question I asked jr's3800.
I guess I need a starting point what should I do next.

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Old 08-02-2004, 02:21 PM   #56
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It'* becoming more of a possiblity in my mind. I know the LeSabre'* have a 2.84 axle ratio (if I recall), which means at the very least, your shift points are probably at the wrong spots. What other problems that may cause, I don't know.

Again, we've had problems posted with similar transplants twice before. That information is here, but I don't recall it having anything to do with TCC lockup. The problem you have is an unproven combination. You don't know the condition of the trans you installed, and you don't know how your PCM is dealing with it.

If the LeSabre PCM controls the TCC with a different wire, you're hosed unless you can figure it out. What you need is the factory service manuals for your car and the donor car for comparison.
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Old 08-02-2004, 02:52 PM   #57
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willwren

If I take it to a good tranny shop do you think they can figure it out?
I have to believe with only 47000 miles the tranny has to be ok ( it was being driven when it was in the accident) the fluid was bright red and full when I pulled it out. The shifts are fast and smooth they seem normal except when you slow down then it gets into this problem but only with the TCC locked. The only reason I changed the fluid was as we pulled the engine and tranny we lost some of the ATF so I just did a filter change and toped it off. I looked at the pictures you posted on your sight willwren but the colors are different on the plug. Could that be because the pictures are from a 1995 instead of 1994?

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Old 08-05-2004, 12:20 PM   #58
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jr's3800

Are you saying I can't use the Buick computer as is.
My thoughts are if the gear ratios were wrong would the Buick'* computer be able to fix my problem because it was the original computer for this tranny?
Could I hurt something if I tried it?

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Old 08-05-2004, 10:54 PM   #59
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FIXED

I have to say if it wasn't for this site I think I would have given up long ago.
Today I finally fixed my problem with my tranny.
It turns out the gear ratio was the problem (it also caused my cruise control trouble)
The fix was so simple all I did was to put the Buick computer in and all was fixed.
The old computer was confused by the different gear ratio and would lock out OD when ever it would see a wrong parameter.

Thanks to all who were nice enough to take the time to help.
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Old 08-06-2004, 12:08 AM   #60
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By Chance did you have any SES light or scan for codes at any poit after the trans swap?
I am having a very similar problem with ol blue not wanting to stay in OD unless I use cruise. If I tap the brakes (turning cruise off) it instantly drops out of OD, almost like into neutral as the rpms will drop from, say, 2500 rpm'* down to 900-1000 rpm and when I hit the gas again it revs up to 3rd gear rpms, and the only way to get back into OD is to restart the car and as soon as the cruise can be set (5 or 10 seconds after powering on) I have to set the cruise.
I have been under the preminition that this was the original trans, but after reading your problem and solution I'm wondering if I might be in the same boat, but at the same time I did at one time put a Superchip programmed for the 2.84 ratio and my car has the 3.06'* (originally -and maybe still).
But it also could be the internal ground wiring in the trans as is a known problem for the 1994-1995 4T60E'*.
Anyhow, glad to hear you got your problem solved.
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