Need some thoughts on this
Thread Starter
Newbie
Joined: Apr 2010
Posts: 7
Likes: 0
2004 E500
Need some thoughts on this
The car is just not feeling right. The idle seems to be off and is riding very rough. Then when I accelerate with the pedal to the floor and then completely take my foot off the gas it make a big knocking sound. I have no clue why this would happen but the car just not seem to not be running smooth at all.
Member
Joined: Jan 2012
Posts: 244
Likes: 4
From: PA, USA
2004 E320 4matic Sedan
Perhaps you could consider and evaluate your engine mounts
Major knocking and roughness can be internal to the engine, or external. You seem to have a 2004 E500, which MAY need engine mounts by now.
This video will give you some idea about diagnosis, and you can search this forum for how to change them, IF they are actually a problem.
http://www.youtube.com/watch?feature...&v=McdjABFZHAY
*** NOTE WELL THAT I DID NOT WRITE THAT YOUR ENGINE MOUNTS ARE DEFINITELY BAD. I WROTE THAT YOU COULD CHECK THEM. You were not able to supply much information, and did not mention any codes or check-engine light, so this check is just my suggestion. +++++
This video will give you some idea about diagnosis, and you can search this forum for how to change them, IF they are actually a problem.
http://www.youtube.com/watch?feature...&v=McdjABFZHAY
*** NOTE WELL THAT I DID NOT WRITE THAT YOUR ENGINE MOUNTS ARE DEFINITELY BAD. I WROTE THAT YOU COULD CHECK THEM. You were not able to supply much information, and did not mention any codes or check-engine light, so this check is just my suggestion. +++++
MBWorld Fanatic!
Joined: Aug 2011
Posts: 3,184
Likes: 16
From: Highlands Ranch, Colorado
2014 BMW M235i
I second the motor mount issue. If it feels rough at either idle or under acceleration and makes a significant knocking sound, the mounts may be bad. Easy way to tell is 1) visually inspect them 2) feel for vibration at idle around the engine and if it's severe it shows you the mounts may be bad.
MBWorld Fanatic!
Joined: Aug 2011
Posts: 3,184
Likes: 16
From: Highlands Ranch, Colorado
2014 BMW M235i
Yeah it's possible they've gone bad in 53,000 miles - not as common but I know a few members that have changed theirs that frequently. It could be the transmission mount too.
Thread Starter
Newbie
Joined: Apr 2010
Posts: 7
Likes: 0
2004 E500
I went out this evening and no knocking at all when I break. I don't know much about the mechanic issues but wouldn't I get the same knocking at hard breaking? Its literally only when I floor the acceleration and then completely remove my foot from the gas and instant pretty loud knocking noise. Almost like hitting a speed bump hard.
Junior Member
Joined: Nov 2012
Posts: 39
Likes: 2
From: Sweden.
W211 E500 -03
I hardly believe that braking will cause the motormount or transmission mount to react since the braking works on the wheels and not the engine. When You hit the accelerator pedal the engine produces torque and that wants to turn the engine on it's side, especially when You hit it abruptly or floor it as You mentioned.
I personally wouldn't drive it like that untill I knew what's wrong whith it, You could damage more things then just the mounts.
.........**Thanks**.
I personally wouldn't drive it like that untill I knew what's wrong whith it, You could damage more things then just the mounts.
.........**Thanks**.
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Junior Member
Joined: Nov 2012
Posts: 39
Likes: 2
From: Sweden.
W211 E500 -03
Yep, it still could be the mounts because when You release the throttle by lifting of the accelerator pedal the engine tilts back to it's normal position from a leaned position from which ever side the torque tilts it.
........**Thanks**.
........**Thanks**.
