Rough idle in drive?
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From: New York
Mercedes S55 AMG
Rough idle in drive?
Lately i have noticed a rougher idle when the car is put in drive or reverse, and idled. Park is smooth. It seems a bit worse now that the temperature outside recently dropped below 50.
Any idea? In the last 40k miles, i have changed: spark plugs, tps sensor, engine and motor mounts.
Could it be the maf, or maybe power steering pump? Or what?
Any idea? In the last 40k miles, i have changed: spark plugs, tps sensor, engine and motor mounts.
Could it be the maf, or maybe power steering pump? Or what?
Thread Starter
Super Member
Joined: Jul 2008
Posts: 769
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From: New York
Mercedes S55 AMG
Also, at higher speeds sometimes i hear a grinding metal on metal sound coming from the front somewhere, but on full throttle really high speeds. Can it be the transmission mounts? Shifts are fine, no other symptons aside from the rough idle in drive/reverse.
I just did a bit more research, and is it possible it's my a/c compressor? During the summer it would rough idle, and when I turned off the climate control, the engine would be normal. Now it's always rough, but maybe because the temperature is lower and below 50 now. Can that have something to do with it?
I just did a bit more research, and is it possible it's my a/c compressor? During the summer it would rough idle, and when I turned off the climate control, the engine would be normal. Now it's always rough, but maybe because the temperature is lower and below 50 now. Can that have something to do with it?
Last edited by rondocap; Nov 7, 2010 at 01:55 AM. Reason: a
Thread Starter
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Joined: Jul 2008
Posts: 769
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From: New York
Mercedes S55 AMG
OK, I took it in to get looked at - and the engine mounts are bad. That's why I am getting so much vibration. I am getting them changed now, that should clear it up - I'll update when I get the car back.
I just changed my transmission/motor mounts 33,000 miles ago back in December...sucks that I have to do it again!
I just changed my transmission/motor mounts 33,000 miles ago back in December...sucks that I have to do it again!
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MBWorld Fanatic!
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SL55, S500
http://www.autohausaz.com/search/pro...ber=2202400617
http://www.benzworld.org/forums/w220...ement-diy.html
3 hours of labor DIY, The shop can probably do this in 2.
$150 for both parts+ 2 hrs labor(100)=350$
Where is the other 550 going too?
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Thread Starter
Super Member
Joined: Jul 2008
Posts: 769
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From: New York
Mercedes S55 AMG
I got the car back, they changed the 2 motor and 1 transmission mount, as well as fixed an AC compressor bracket that was broken.
The noise and vibration are all completely gone, the car runs 100% quiet and smooth like it used to. That solved it!
The last motor/transmission mounts were done at 85k and at 117k miles, and now 150k. So they seem to come around every 30k or so.
The noise and vibration are all completely gone, the car runs 100% quiet and smooth like it used to. That solved it!
The last motor/transmission mounts were done at 85k and at 117k miles, and now 150k. So they seem to come around every 30k or so.
MBWorld Fanatic!
Joined: Jul 2010
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SL55, S500
I got the car back, they changed the 2 motor and 1 transmission mount, as well as fixed an AC compressor bracket that was broken.
The noise and vibration are all completely gone, the car runs 100% quiet and smooth like it used to. That solved it!
The last motor/transmission mounts were done at 85k and at 117k miles, and now 150k. So they seem to come around every 30k or so.
The noise and vibration are all completely gone, the car runs 100% quiet and smooth like it used to. That solved it!
The last motor/transmission mounts were done at 85k and at 117k miles, and now 150k. So they seem to come around every 30k or so.
I'm on 93k Miles now and don't think I've ever touched those.
Also what shop do you go to Rondo? I'm curious
Last edited by Das Geld 2; Nov 11, 2010 at 08:16 PM.
Thread Starter
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From: New York
Mercedes S55 AMG
The symptoms were a lot of vibration when the car was in idle, but only when reverse or drive were engaged. Also, if you opened the hood, and stepped on the brake while accelerating a bit, you could see the engine go up a lot, which isn't normal as it should not move that high.
MBWorld Fanatic!
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SL55, S500
The symptoms were a lot of vibration when the car was in idle, but only when reverse or drive were engaged. Also, if you opened the hood, and stepped on the brake while accelerating a bit, you could see the engine go up a lot, which isn't normal as it should not move that high.
Thread Starter
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Joined: Jul 2008
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From: New York
Mercedes S55 AMG
So now that it is getting colder, I noticed another strange thing: (Remember, I just changed the engine/transmission mounts this month)
When I startup the car, and it's cold, the car vibrates a good bit for 20 seconds or so, until the revs die down. The revs and louder whining is normal, but I don't remember the car vibrating so much at startup. Is this normal? Is it possible the motor mounts were installed a little bit incorrectly? Or can this be another issue?
Or maybe the mounts are cold, and since they are new, maybe aren't warmed up enough yet. Who knows!
When I startup the car, and it's cold, the car vibrates a good bit for 20 seconds or so, until the revs die down. The revs and louder whining is normal, but I don't remember the car vibrating so much at startup. Is this normal? Is it possible the motor mounts were installed a little bit incorrectly? Or can this be another issue?
Or maybe the mounts are cold, and since they are new, maybe aren't warmed up enough yet. Who knows!
Last edited by rondocap; Nov 28, 2010 at 10:14 PM. Reason: a
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So now that it is getting colder, I noticed another strange thing: (Remember, I just changed the engine/transmission mounts this month)
When I startup the car, and it's cold, the car vibrates a good bit for 20 seconds or so, until the revs die down. The revs and louder whining is normal, but I don't remember the car vibrating so much at startup. Is this normal? Is it possible the motor mounts were installed a little bit incorrectly? Or can this be another issue?
Or maybe the mounts are cold, and since they are new, maybe aren't warmed up enough yet. Who knows!
When I startup the car, and it's cold, the car vibrates a good bit for 20 seconds or so, until the revs die down. The revs and louder whining is normal, but I don't remember the car vibrating so much at startup. Is this normal? Is it possible the motor mounts were installed a little bit incorrectly? Or can this be another issue?
Or maybe the mounts are cold, and since they are new, maybe aren't warmed up enough yet. Who knows!
