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Old 08-22-2006, 12:41 AM
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what does a torque converter feel like when it is bad?

Hello I have been posting on my chugging/vibration/hesitation thing for a 91 olds 88 3.8 motor for a while now......and got to wondering if it could be the torque converter........what are typicial symptoms and if so, should I replace the converter before it takes out the transmission (the car shudders when light on the gas at 40 steady speed, get off the gas and it goes away)....could be the motor too

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Old 08-22-2006, 10:30 AM
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This is the engine column.

could be lugging in overdrive. Does it do it in 3 rd gear? Try keeping it out of overdrive until you hit 45+.
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Old 08-22-2006, 11:21 PM
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well I can leave it in drive and not in over drive..... it still does it just as soon as it shifts into the highest gear possable at the 35 to 42 range even keeping the selector out of overdrive
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Old 08-23-2006, 12:38 PM
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does it do it at slower speeds, say below 35 when it is still in 3rd? Sounds to me like you are just too low in the RPMs and the motor doesn't make enough power that low, especially in overdrive going 40....
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Old 08-24-2006, 01:01 AM
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no, It does not do it below 35 and in drive......I am not using overdrive....it does not matter if the selector is in over drive or drive
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Old 08-24-2006, 01:04 AM
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how could I be too low in the rpms when this is an automatic left in drive.....so am I supposed to shift this thing manually 1st 2nd, 3rd manually.......ha ha just kidding, we at gm offered this 91 olds with an automatic but dont use it, instead you must still shift it manually??
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Old 08-24-2006, 01:10 AM
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I know what lugging feels like, just leave the truck I have in 3rd gear and go 15 mph.......ITS NOT LUGGING............it feels like the vibration I am feeling is around the 4hz range of frequency....almost like my tires are out of round
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Old 08-24-2006, 06:49 AM
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I had a 93 Buick with the 3.8 as well and it probably has the same transmission that Olds does. Mine did the same thing too, but it was usually closer to 60 or going up hills. It would quit when you put your foot into it and it kicked down. The minute I let off the throttle and it shifted back into OD it would start doing it again. That car always shifted into OD way too early and never stayed in lower gears climbing hills without putting your foot in the throttle. I always just dropped it down to 3rd up the longer hllls. I've always been kinda curious what caused the shuddering as well.
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Old 08-24-2006, 10:00 PM
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my guess would be it is the lockup torque converter locking too soon. A friend of mine had a pontiac with a 3.8 in it, I think his car was a 92 or so...his got progressively worse until the car actually started to die when he would slow down from like 40 to 25 or 30, and sometimes in town when he'd get going 30 it would lockup the converter and sometimes die...

He didn't know what the problem was and took it to a shop, they unplugged the wires for the lockup, and after that, the car runs fine (probably doesn't get quite as good mileage on the highway...)

Chris
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Old 08-24-2006, 11:24 PM
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I'm trying to think here so sorry if this is wrong (the other forum i go to is being updated) but if you have the 4T60 it would most likely be the lockup, but if you have the 4T60E it could also be a vacuum leak (the shift points are controlled by the vacuum or something like that, I think) I know my car has a vacuum leak at the transmission when it was doing this.

HybridSTE
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Old 08-25-2006, 12:41 AM
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I have the 4t60 they didnt have the 4t60e until 1992 so I am told....not computer controlled other than the lockup
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Old 08-25-2006, 02:00 AM
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Maybe try a site with a little more knowledge on the setup you have (sorry, but there is no offence meant by this). www.60degreev6.com

HybridSTE
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Old 08-25-2006, 06:17 AM
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If it's only the torque converter that is computer controled, then unplug it! There should be a disconnect at the transmission case. If it's a beater car, leave it unplugged. Dan
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Old 08-25-2006, 07:24 AM
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Quote:
Originally Posted by hemi43
If it's only the torque converter that is computer controled, then unplug it! There should be a disconnect at the transmission case. If it's a beater car, leave it unplugged. Dan
leave it unplugged and ull burn up the trans... get the engine fixed... its acting up because the engine has a miss, and is really noticeable when the torque converter clutch engages..
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Old 08-25-2006, 12:19 PM
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Quote:
Originally Posted by hybridste
Maybe try a site with a little more knowledge on the setup you have (sorry, but there is no offence meant by this). www.60degreev6.com

HybridSTE
um yea........think you might want to go to that site too....since I dont have a 60 degree v6 or at least the 60 degree v6's I know of are the 2.8 3.1 maybe the 3.3 and the 3.4.....not sure about the 3.6........there is no mention of a 3.8

Last edited by fumplet; 08-25-2006 at 12:58 PM.
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