C300 tranny and steering knocking sound
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Joined: May 2007
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From: Toronto, ONT
2008 C300
C300 tranny and steering knocking sound
I sometimes get a knocking sound when turing to steering wheel full left or right when i am driving off the parking lot (hot and cold start). Also, i am getting some hard shifts with the tranny when i am trying to stop from a red light. the "knock" of the shift seems to happen in "C" mode and when down shifting from 3rd to 2nd. Anyone getting the same problem and knows a fix? thanks!
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Joined: Jan 2008
Posts: 149
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From: New York
'08C300 White w P2,MM,Pano
Yep, i made a post about it while ago.... no one seemed to have a solution... i also brought it to 3 dealers, and 2 foreman test drives.... the answer........ THATS HOW THE CAR WAS BUILT......
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Joined: Aug 2007
Posts: 446
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'08 C 300 Sport, '01 SL 500 & '08 Nissan Frontier SE Crew Cab 4WD
My tranny some times bucks lightly when I pull up to my driveway. Basically I pull up to my driveway, then wait till my garage door is up. Lightly touch the gas and it sometimes feels like it's not in the right gear for a moment. Every now and then it will do the same after stopping at a light or stop sign and turning right. I have not yet addressed it with my dealer, but thinking of changing the tranny fluid with some Royal Purple or AmsOil in the near future and see if that fixes it? I had a W204 rental while our car was in for other repairs and It didn't do it so I know it's not just me.
-Ryan
-Ryan
Super Member
Joined: Apr 2008
Posts: 765
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From: Walnut Creek, CA
325Ci, 325Cic, C300
I sometimes get a knocking sound when turing to steering wheel full left or right when i am driving off the parking lot (hot and cold start). Also, i am getting some hard shifts with the tranny when i am trying to stop from a red light. the "knock" of the shift seems to happen in "C" mode and when down shifting from 3rd to 2nd. Anyone getting the same problem and knows a fix? thanks!
I do plan to bring it up with the dealer eventually. I am inclined to wait just before the warranty expires before I do to increase the chance that a TSB would be out, a "fixed" replacement part becomes available (in case of an error in design), and to maximize the out-of-warranty time with the new part.
Regards,
Paolo
Super Member
Joined: Dec 2007
Posts: 648
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From: Seattle
C-300, XC70, Wrangler
Bucking is apparently one of the features of the 7-sp tranny. Try this: stop at a red light, the hit the gas because the light goes green as soon as the car actually stops. She'll buck. It's not settled into whatever gear it thinks it needs yet. My suspicion is that when you stop it takes a wee bit of time to hit first, but if you hit the gas while it's trying to find first, it'll buck.
If you can't find a cooperative red light, try doing this in a vacant parking lot.
If you can't find a cooperative red light, try doing this in a vacant parking lot.
Super Member
Joined: Apr 2008
Posts: 765
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From: Walnut Creek, CA
325Ci, 325Cic, C300
What's even more interesting (in my case at least) is that the knocking ONLY comes out when the car is going in reverse. No matter how I aggressive I turn the wheel, as long as i'm moving forward, the knocking sounds are absent.
Maybe it isn't in the steering column like we think?
Regards,
Paolo
Maybe it isn't in the steering column like we think?
Regards,
Paolo
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Joined: May 2004
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From: California
2014 C250 sport
What's even more interesting (in my case at least) is that the knocking ONLY comes out when the car is going in reverse. No matter how I aggressive I turn the wheel, as long as i'm moving forward, the knocking sounds are absent.
Maybe it isn't in the steering column like we think?
Regards,
Paolo
Maybe it isn't in the steering column like we think?
Regards,
Paolo
Has anyone taken their car in for this?
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Joined: Oct 2008
Posts: 2,601
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From: Atlanta, GA
2008 C300 Sport 6 Speed Manual, 1953 Chevy Bel-Air, 2015 Audi allroad, 1963 Chevy Apache
mine has the grinding feel only in reverse and turning right. I plan on adding that to the list on my initial visit and will post what they say if someone doesnt beat me to it.
Senior Member
Joined: Aug 2007
Posts: 446
Likes: 1
'08 C 300 Sport, '01 SL 500 & '08 Nissan Frontier SE Crew Cab 4WD
Bucking is apparently one of the features of the 7-sp tranny. Try this: stop at a red light, the hit the gas because the light goes green as soon as the car actually stops. She'll buck. It's not settled into whatever gear it thinks it needs yet. My suspicion is that when you stop it takes a wee bit of time to hit first, but if you hit the gas while it's trying to find first, it'll buck.
If you can't find a cooperative red light, try doing this in a vacant parking lot.
If you can't find a cooperative red light, try doing this in a vacant parking lot.
-Ryan
no problems
MBWorld Fanatic!
Joined: Oct 2008
Posts: 2,601
Likes: 28
From: Atlanta, GA
2008 C300 Sport 6 Speed Manual, 1953 Chevy Bel-Air, 2015 Audi allroad, 1963 Chevy Apache
...of course we all have the same steering and mine is doing the same thing
Senior Member
Joined: Jan 2009
Posts: 291
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From: SoCal
C350
wow honestly is this something to even be complaining about?? Oh no you felt the car shift and it wasn't smooth enough?!?!?! that's how the car was built, if u didn't like it then u shouldn't have gotten it.
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Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
The bucking is caused by catching out the torque converter lock up clutches. Improved with later software.
Super Moderator
Joined: Jun 2008
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
I think it's fair to say improved the chances of you catching it out. You can still catch it out if if you brake hard and the hammer the throttle without coming to a full stop. This problem goes right back to the 722.6 5 speed auto. Drive smoothly & it's unlikely you will catch the box in lock up transition.
Remember for efficiency these boxes never free wheel - The torque converter is locked from just after pull away to just before coming to a halt.
Remember for efficiency these boxes never free wheel - The torque converter is locked from just after pull away to just before coming to a halt.
Last edited by Glyn M Ruck; Apr 25, 2009 at 09:06 AM.
