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Old 11-03-2014, 11:58 AM
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SOLVED: Alright, help me troubleshoot this shake...

UPDATE: Lots of good info in this thread, but if you want to skip to the solution, go to this post.

I've done a ton of searching, a ton of reading, and I've already done some things, to no avail. Yes. It's another shake/vibration thread.

2005 X5 4.8is, right now it's at 111,900 miles.

Things that have been done in the last 3000 miles:

• SOME front suspension work, I believe just the lower control arms (this was done prior to purchase).
• Front brake pads & rotors.
• Wheels balanced.
• Brake Booster Replaced.
• Spark Plugs Replaced.
• New Front Rotors Machined.
• Wheels Balanced (different shop).
• Rear Drive Shaft Replaced.
• Rear Drive Shaft Guibo Replaced.

Not all of this was done to specifically troubleshoot the shake, just wanting to be complete.

What I'm feeling is a shake, right under my thighs, around 1500RPM. It doesn't happen right away when the X is cold. It feels great for the first 15 minutes or so of driving, but after the X is warmed up, it vibrates pretty much non-stop.

I feel it right under my thighs. If my knee is resting on the door handle, I feel it there, too. I've even seen it in the driver's side mirror. I also feel it in the steering wheel. I think I feel it in the shifter, too, but I can't be sure. It's a big enough shake that I think it's just shaking pretty much the whole vehicle. This isn't a subtle shimmy, it really just starts to shake. Once it gets to shaking I can even hear the shake.

I just got it back with the drive shaft work completed on Friday. Didn't have a chance to drive it on Saturday, but yesterday I took it out and basically the drive shaft didn't change anything. No better, no worse. I do NOT hear the whine that would point toward a wheel bearing. I don't hear any strange noises, no suspension clunking or creaking, nothing until I can literally hear the shake.

The one thing I did notice yesterday that I hadn't noticed before is that, once it starts shaking, when I start slowing down to come to a stop, the shake completely goes away upon a downshift, I believe it's from 3rd to 2nd, though I guess it could be from 2nd to 1st, not positive. But it's like it instantly goes away upon that downshift.

I'm hoping to build a punch list to go through. I had convinced myself that it was still suspension issues until my indy suggested the drive shaft. Then he put it up and pulled the drive shaft and the CV joint was super rough, so I guess I had my hopes up that "yep, this is the problem". Well, it wasn't. I'm ready to have this thing fixed.

I'm not even mad that I just dropped cash on the drive shaft, I'm all about fixing things before they completely crap out, but right now my priority is taking care of this shake. It's preventing me from enjoying the ride.

So, thoughts?
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Last edited by thrillcat; 12-09-2014 at 10:33 AM. Reason: Solved
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Old 11-03-2014, 12:06 PM
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Things I'm thinking:

Engine Mounts?
Suspension? Front or Rear?
Front drive shaft guibo?

I have also been planning yet delaying a transmission fluid/filter change, basically allocating my funds toward the shake first. Could they be related? This downshifting thing has me worried now that it could be transmission related more than suspension or drivetrain...
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Old 11-03-2014, 12:13 PM
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Check your motor mounts and CV axles.

I'm theorizing motor mounts though. Check them using the tips from SlickGT1:

"To check the motor mount, put the car in drive, pull up the e-brake, hold brake pedal with one foot, and use other foot for throttle. Have the hood open, and have someone stand to the side and look at engine while you give it a couple of solid revs in drive. If the engine tilts hard core, your mount is done. Do same in reverse. "
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Old 11-03-2014, 12:18 PM
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yep a mount or a bad CV would be my suggestions as well.
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Old 11-03-2014, 12:20 PM
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Thanks RB, I'll check that this afternoon. I guess I'm kind of hoping for this, because it seems like a relatively inexpensive fix...
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Old 11-03-2014, 12:21 PM
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Quote:
Originally Posted by Jack_James View Post
yep a mount or a bad CV would be my suggestions as well.
Bad CV at a wheel(s)?
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Old 11-03-2014, 12:35 PM
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If it was a bad CV though I don't think it would do it at idle. My money is on motor mount
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Old 11-03-2014, 12:48 PM
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Quote:
Originally Posted by Ricky Bobby View Post
If it was a bad CV though I don't think it would do it at idle. My money is on motor mount
But it's not shaking at idle. Only in motion. Once I hit that specific downshift it's gone until I get up and going again.
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Old 11-03-2014, 12:56 PM
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It could be trans related, perhaps.

I don't know I've never owned an auto trans vehicle in my life.
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Old 11-03-2014, 01:08 PM
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This is getting on my nerves. I bought the vehicle in July...at the beginning of August I drove to CO. On the way back was the first I felt this problem. It happened on the freeway. I thought I had a flat. Pulled off at an exit, saw no signs of anything wrong. Drove off carefully and the problem had disappeared. About hour and a half later, same thing happened. I slowed down to pull off, but just slowing down without even stopping made the shake go away.

Drove the rest of the way back to Iowa with no issues.

It gradually started happening more often, more frequently, until over the last few weeks it's been pretty much every time I drive the vehicle.

I spent the first month getting the brake booster issue taken care of on the seller's tab, but since then I've been troubleshooting the shake, to no avail.
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