yarikoptic Posted April 9, 2007 Share Posted April 9, 2007 To diagnose my vibration problem I found a friend with a shop and a lift, but whenever we lifted my subi, and started it up, on a slight acceleration car did "BOOM"... Without touching gas pedal front wheels are rotating and from rear ones I think just 1 was spining a bit... So was that BOOM due to high clearance of outback so whenever it got raised and wheels go down as much as they could, CV joints can't accomodate that much of an angle any more? whenever front was lifted, and I was working on changing CV shaft, I could easily spin the wheels... so my guess would be that BOOM due to rear CV joints getting stuck due to much of an angle... am I correct? is there an easy and common way on how to "run" Outbacks while they are lifted? may be I could compress the coilovers on the back a bit (I guess there should be some clearance to get those spring compressors on the back coilovers...)? or may be some other nice way? I remember my 95 legacy had no problem spinning its wheels while in the air ;-) Quote Link to comment Share on other sites More sharing options...
nipper Posted April 9, 2007 Share Posted April 9, 2007 not the CV joints. You need to locate better where the boom is coming from. nipper Quote Link to comment Share on other sites More sharing options...
idosubaru Posted April 9, 2007 Share Posted April 9, 2007 have you posted about the vibration problems on here? is it at all speeds, where do you feel it, is there any noise associated with it? i would remove the driveshaft and inspect it. a loose ujoint is typically noticeable on the car easily enough, but a seized joint can be nearly impossible to tell without actually removing or disconnecting it, but is equally as bad. have you tried rotating the tires to see if the vibration "moves" say front to back? Quote Link to comment Share on other sites More sharing options...
yarikoptic Posted April 9, 2007 Author Share Posted April 9, 2007 have you posted about the vibration problems on here? is it at all speeds, where do you feel it, is there any noise associated with it? yes - I did ;-) Sorry that I didn't include a link in the post: http://www.ultimatesubaru.org/forum/showthread.php?t=72752 i would remove the driveshaft and inspect it. a loose ujoint is typically noticeable on the car easily enough, but a seized joint can be nearly impossible to tell without actually removing or disconnecting it, but is equally as bad. have you tried rotating the tires to see if the vibration "moves" say front to back? tires-vibration comes back as well... crappy tires... grr... but 20-30 mph one seems to be smth else Indeed - I should take the driveshaft off... heh heh - need to wait for warmer weather ;-) Quote Link to comment Share on other sites More sharing options...
Skip Posted April 9, 2007 Share Posted April 9, 2007 no one has mentioned the front DOJs -> Double Offset Joints aka inner CV joints They can cause starnge vibrations upon accel - only. Quote Link to comment Share on other sites More sharing options...
nipper Posted April 9, 2007 Share Posted April 9, 2007 Ok i am confused, arer we talking about a boom or a vibration? nipper Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted April 9, 2007 Share Posted April 9, 2007 Does it just boom and then the wheels are turning OK? Maybe the boom is related to this excerpt from TSB 16-66-02 1999-2002MY 4EAT Vehicles? Some customers may comment, when they are driving in snow and ice and they try to accelerate during slow speed driving, that they feel a bang from the rear of the vehicle. This is caused by the transfer clutch being applied quickly when the system detects slight wheel slippage. Quote Link to comment Share on other sites More sharing options...
yarikoptic Posted April 9, 2007 Author Share Posted April 9, 2007 no one has mentioned the front DOJs ->Double Offset Joints aka inner CV joints They can cause starnge vibrations upon accel - only. Well -- as for vibration -- I've replaced left half shaft -- vibration remain there... then I replaced right one with the one from the left -- nothing got changed. So, probably both of them are not good.... on the other hand -- I found that left differential stub (with a circlip at the end) was a bit easy imho to pull out. I think I've mentioned that in the previous email. But I guess for the vibration, I better check the driveshaft first of all. Quote Link to comment Share on other sites More sharing options...
yarikoptic Posted April 9, 2007 Author Share Posted April 9, 2007 Does it just boom and then the wheels are turning OK? Maybe the boom is related to this excerpt from TSB 16-66-02 1999-2002MY 4EAT Vehicles? Some customers may comment, when they are driving in snow and ice and they try to accelerate during slow speed driving, that they feel a bang from the rear of the vehicle. This is caused by the transfer clutch being applied quickly when the system detects slight wheel slippage. Good call -- but unfortunately we released the pedal right after the boom... and then after a min or two, when gas pedal was depressed again -- it did the same. but it kinda makes sense. Weird behavior though... Quote Link to comment Share on other sites More sharing options...
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