Grinding/crunching sound on acceleration
Thread Starter
Member
Joined: Nov 2005
Posts: 165
Likes: 27
From: Buford, Ga
2023 EQE AMG
Grinding/crunching sound on acceleration
Hello Guys
I am having a recent grinding sound when I go from a start to accelerate. I am thinking that it is chain the transfer case but I had the oil changed, and I can't really pinpoint but it does seem to be coming from my side of the cabin .. Anyone have experiance with this? Could the chain in the transfer case need adjustment?
I took it to the dealer last service and they said they didn't find anything..
I am having a recent grinding sound when I go from a start to accelerate. I am thinking that it is chain the transfer case but I had the oil changed, and I can't really pinpoint but it does seem to be coming from my side of the cabin .. Anyone have experiance with this? Could the chain in the transfer case need adjustment?
I took it to the dealer last service and they said they didn't find anything..
Thread Starter
Member
Joined: Nov 2005
Posts: 165
Likes: 27
From: Buford, Ga
2023 EQE AMG
I would think the wheel bearing would be all the all time.. It seems to only happen if I try to accelerate hard I will take the wheel and see if I can here and grinding thanks for the idea.
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Joined: May 2015
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From: Allentown, PA
'08 GL 320 CDI
It's hard to say what it is over a forum, especially if someone (dealer) couldn't find it in person. You know how it is... My car makes a sound, what is it? Kinda hard for us in cyberspace to hear it from here! 
Wheel bearings are a good thought, though. I would normally think of a bad wheel bearing as a "growling" sound, but that's just semantics. Sometimes, though, they only "complain" when they get extra stress on them... hard acceleration, for example. Try, in a parking lot, turning hard left or right at different throttle positions. See if that makes any difference. If you only hear it when turning in one direction, that helps narrow it down.
Although that's a pretty basic test and I would assume that a dealer would have done that.
Wheel bearings are a good thought, though. I would normally think of a bad wheel bearing as a "growling" sound, but that's just semantics. Sometimes, though, they only "complain" when they get extra stress on them... hard acceleration, for example. Try, in a parking lot, turning hard left or right at different throttle positions. See if that makes any difference. If you only hear it when turning in one direction, that helps narrow it down.
Although that's a pretty basic test and I would assume that a dealer would have done that.
Last edited by DennisG01; Apr 24, 2017 at 09:53 AM.
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it is your center diff snacking on itself most likely.
if it isnt the diff it is your pass side cv joint (you might hear it on the driver side, but it is most often the pass side cv joint that goes)
take it to dealer and ask them to troubleshoot via chassis ears
if it isnt the diff it is your pass side cv joint (you might hear it on the driver side, but it is most often the pass side cv joint that goes)
take it to dealer and ask them to troubleshoot via chassis ears
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BMW 335d
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From: Espoo, Finland
2012 GL 350
It's easy to diagnose a wheel bearing. On a empty road you weave back and forth. The wheel bearing will make noise when loaded (i.e. when the weight is transferred to that side of the vehicle.) When you load the opposite side, the sound goes away.
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