91 Buick Lesabre hesitacion at 48 mph. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-25-2012, 09:56 PM   #1
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Default 91 Buick Lesabre hesitacion at 48 mph.

I have a 91 Buick Lesabre,3800-- 200thousand miles, what I an getting is a delay or hesitation at around 48mph. driving up a slight grade, the problem is around 52mph. If I start out in D then shift to OD at 50 mph , I dont have thie problem, car will run fine.
no check engine light. Installed new plugs, plug wires ,coilpacks,fuel filter, and fuel pressure regulator. still having the same problem.
Now i have been told that it could be the Ignition Module, or because my alternater is reading 15 VOLTS.
any help would be very appreciative....
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Old 07-25-2012, 10:15 PM   #2
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It would appear your attempting to lug the engine while the torque converter is locked up. Mine does the same thing if I try to push too hard on the accelerator while its locked up.

Though I'm sure others will chime in with other possibilities.
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Old 07-26-2012, 01:29 AM   #3
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Quote:
Originally Posted by jhigh View Post
I have a 91 Buick Lesabre,3800-- 200thousand miles, what I an getting is a delay or hesitation at around 48mph. driving up a slight grade, the problem is around 52mph. If I start out in D then shift to OD at 50 mph , I dont have thie problem, car will run fine.
no check engine light. Installed new plugs, plug wires ,coilpacks,fuel filter, and fuel pressure regulator. still having the same problem.
Now i have been told that it could be the Ignition Module, or because my alternater is reading 15 VOLTS.
any help would be very appreciative....
Actually, a bit of hesitation in fourth gear with the TCC engaged can be caused by your vehicle needing a tune-up. The 4T60 is weird like that. However, you changed just about every ignition component, so you should be good on that front.

I don't think your alternator'* voltage regulator would cause a little hesitation. Granted, 15 volts is almost 10% more voltage than your car is expecting; however, your car electronics generally don't start acting up until you hit about 16 V (well, according to my stereo'* manual, at least).

Don't forget, your alternator output is inversely proportional to its temperature. On a cold winter'* morning, mine will start at over 15 V (14-ish in the summer) before settling down as it warms up.
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Old 07-26-2012, 01:30 AM   #4
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Oh, and welcome to GM Forum, Judy!
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Old 07-26-2012, 07:33 AM   #5
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when ever mine has done that its been ign related did you check for corrosion on the icm tabs? voltage is likely normal if you checked it with a meter, i wouldnt think that would cause the issue anyway
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Old 07-26-2012, 04:18 PM   #6
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Default 91 Buick Lesabre hesitacion at 48 mph.

Thanks for all the suggestions,,well heser'* an update, i was told that it migkt be a transmission problem, to drop the pan and see what i could find, change filter and fluid.
well anyhow i did find a piece of plastic in the bottom of the pan, its about 1/8 in thick, 3/8inch wide and about 2 inches long. dont know what it is .
91 Buick Lesabre hesitacion at 48 mph.-plastic2.jpg
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Old 07-26-2012, 08:17 PM   #7
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Looks like a piece of the filter.. not sure how those get outside the filter case and into the pan..

This guy found the same thing: https://www.gmforum.com/park-avenue-...ipping-303110/
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Old 07-27-2012, 07:07 AM   #8
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That'* not a piece of the filter. That I believe is the 4th clutch thrust washer. I have seen that in the pan'* of 3 different trans. Plus, the filter is black, not white like that piece in the picture.
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Old 07-28-2012, 05:15 AM   #9
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Originally Posted by Mike1995 View Post
That'* not a piece of the filter. That I believe is the 4th clutch thrust washer. I have seen that in the pan'* of 3 different trans. Plus, the filter is black, not white like that piece in the picture.
I hope for my own, and their transmission'* sake you're wrong. :(
I know when had those issues I had slipping in 3rd and 4th, and in reverse, I changed the old dirty fluid, and it quit slipping, I wish I had saved the old filter, I'd open it up and see if that material is in the filter anywhere.
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Old 07-28-2012, 05:23 AM   #10
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:/ I am pretty sure you are totally correct Mike, just found this in an old thread here.
https://www.gmforum.com/1992-1999-91...-w-pix-253684/

I wonder how long the transmission will hold up before either of us have to have it rebuilt?
I suppose if they have the money now it would be best to go ahead and have it rebuilt.
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