Shudder under sharp acceleration
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I just noticed a shudder in the driveline that appears only under heavy acceleration. It goes away immediately after lifting the pedal again and does also not appear when gradually accelerating, so it's not connected with speed it seems.
Could this be the dreaded Torque Tube issue?
Piet
87S4 AT
Could this be the dreaded Torque Tube issue?
Piet
87S4 AT
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Piet,
Just some random shots, for I have no answer: Firstly, the serious issue of "dread" would be the thrust bearing - and I'm sure you had done the pinch bolt release/crank end float or free play measure; therefore, that would not be an issue.
Some things that come to mind under your conditions would be loose rivets in the front flex disc: some early '87s had rivets that that came loose and created problems - they were later replaced by bolts. Bad TT bearings should be noticible at lower speeds; however, if the rubber TT bearing support failed, there may be vibration when pushed hard. Loose pinch bolts, front and rear may be an issue, torque convertor bearings beginning to go, ... just guesses ...
Just some random shots, for I have no answer: Firstly, the serious issue of "dread" would be the thrust bearing - and I'm sure you had done the pinch bolt release/crank end float or free play measure; therefore, that would not be an issue.
Some things that come to mind under your conditions would be loose rivets in the front flex disc: some early '87s had rivets that that came loose and created problems - they were later replaced by bolts. Bad TT bearings should be noticible at lower speeds; however, if the rubber TT bearing support failed, there may be vibration when pushed hard. Loose pinch bolts, front and rear may be an issue, torque convertor bearings beginning to go, ... just guesses ...
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Here's what I'd check in order:
1. Half shafts
2. Driveline mounts (transaxle, engine)
3. Rear suspension points (weissach, bushings)
4. Drive shaft pinch couplers.
5. Transmission
1. Half shafts
2. Driveline mounts (transaxle, engine)
3. Rear suspension points (weissach, bushings)
4. Drive shaft pinch couplers.
5. Transmission
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#11
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Piet,
Check for loose seat mount/rail hardware.
Sometimes, under hard acceleration, when your butt puckers-up real fast and your wallet has one cheek or the other raised slightly higher than the other the seat shudder will develope.
Hey, Steve...
Check for loose seat mount/rail hardware.
Sometimes, under hard acceleration, when your butt puckers-up real fast and your wallet has one cheek or the other raised slightly higher than the other the seat shudder will develope.
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Hey, Steve...
#12
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Kraabel, never got to the bottom of it because the problem just went away and I didn´t want the shop to spent time hunting possible problems down. It´s still not exactly a smooth car but most of that is probably due to it needing new motormounts. And the intake removal and repair. And.. Sigh.
After the summer I´ll have a garage at my disposal and can start tackling these things. Finally.
John.. I like your suggestion, my wallet is usually filled with half a kilo of loose change and no notes to dampen it. So![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Piet
928S4 '87
After the summer I´ll have a garage at my disposal and can start tackling these things. Finally.
John.. I like your suggestion, my wallet is usually filled with half a kilo of loose change and no notes to dampen it. So
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Piet
928S4 '87
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IT WILL COME BACK AND HAUNT YOU!!!
OK not so serious, but this might be a problem with your TT(yep, the dreaded one).
When you take time to check your TT, check also (almost mandatory based in your symptoms) the rear flex plate and torque converter. You have symptoms of a slipping tube that does not engage properly at all times, the problem went away because the tube catch enough on either end to keep transmitting power form eng. to gearbox. Eventually it would come back (specially of you drive on an inclined road)....
OR in the other hand, it could just be your plugs/cables...one or two might be already too old and losing some conductivity....
OK not so serious, but this might be a problem with your TT(yep, the dreaded one).
When you take time to check your TT, check also (almost mandatory based in your symptoms) the rear flex plate and torque converter. You have symptoms of a slipping tube that does not engage properly at all times, the problem went away because the tube catch enough on either end to keep transmitting power form eng. to gearbox. Eventually it would come back (specially of you drive on an inclined road)....
OR in the other hand, it could just be your plugs/cables...one or two might be already too old and losing some conductivity....
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Originally posted by Nicobel
IT WILL COME BACK AND HAUNT YOU!!!
IT WILL COME BACK AND HAUNT YOU!!!
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Piet
87S4 '87
Peugeot 205 Diesel
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