Vibration during WOT acceleration
Thread Starter
MBWorld Fanatic!
Joined: Apr 2017
Posts: 1,120
Likes: 80
From: Tampa Bay, FL
05 E55, 98 CLK320
Vibration during WOT acceleration
All
When I'm on the highway between 70-140mph I tend to have this vibration especially vivid when I get on the pedal a bit more. Sometimes I'd be cruising between 70-80mph and the vibration is non existent, other times it feels like the car is bouncing up and down at the engine bay, I can feel it in the gas pedal as well.
How can I determine what it is? If it's a missfire???
It seems to fall under the same range that I have a vibration at idle (in park that is) between 1800-2400 rpm which to me seems like either one of the pistons/cylinders is damaged or I have a missfire of some sort.
No codes whatsoever. Again the weird part is that sometimes the vibration is there sometimes it isn't. I also have a leak at the rear main seal if that helps...
I have new poly mounts, they were installed at a shop though so I can't make a comment. I think the vibration was there even with the old mounts.
When I'm on the highway between 70-140mph I tend to have this vibration especially vivid when I get on the pedal a bit more. Sometimes I'd be cruising between 70-80mph and the vibration is non existent, other times it feels like the car is bouncing up and down at the engine bay, I can feel it in the gas pedal as well.
How can I determine what it is? If it's a missfire???
It seems to fall under the same range that I have a vibration at idle (in park that is) between 1800-2400 rpm which to me seems like either one of the pistons/cylinders is damaged or I have a missfire of some sort.
No codes whatsoever. Again the weird part is that sometimes the vibration is there sometimes it isn't. I also have a leak at the rear main seal if that helps...
I have new poly mounts, they were installed at a shop though so I can't make a comment. I think the vibration was there even with the old mounts.
Last edited by MACEDON; Nov 29, 2017 at 08:38 AM.
Super Member
Joined: Mar 2009
Posts: 937
Likes: 15
From: Alpharetta Georgia
2006 E55, 2006 saab 93 aero, 2010 glk 4m
I was going to say mounts but you mention you think the vibration was there before. If your old mounts were shot it would explain that and the new poly mounts I expect would have a slight vibration to them as though especially in colder weather.
Also, how fresh are your plugs? Also possible, a failing coil pack.
Also, how fresh are your plugs? Also possible, a failing coil pack.
Thread Starter
MBWorld Fanatic!
Joined: Apr 2017
Posts: 1,120
Likes: 80
From: Tampa Bay, FL
05 E55, 98 CLK320
The plugs were done in May/June actually, had em done at the best indy shop in my local area and he used the Bosch stock specs complete with wires. I haven't pulled them since to check them out, I should try it.
I'm afraid it might be the cyl 8 starvation issue adding to it all, the car was driven with a 180mm crank pulley and no cooling mods in Miami FL for a WHILE before I got my hands on it and put in a PLM cooler, so keep that in mind.
It has SLR cams on top of it which I didn't know so not sure how much that makes a difference.
How can I test the coil packs?
Could it be a voltage issue?
Could it be a fuel supply issue?
I have yet to check the voltage and fuel pressure with a gauge, the car is down with the airmatic compressor currently.
I'm afraid it might be the cyl 8 starvation issue adding to it all, the car was driven with a 180mm crank pulley and no cooling mods in Miami FL for a WHILE before I got my hands on it and put in a PLM cooler, so keep that in mind.
It has SLR cams on top of it which I didn't know so not sure how much that makes a difference.
How can I test the coil packs?
Could it be a voltage issue?
Could it be a fuel supply issue?
I have yet to check the voltage and fuel pressure with a gauge, the car is down with the airmatic compressor currently.
Last edited by MACEDON; Nov 29, 2017 at 09:06 AM.
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Thread Starter
MBWorld Fanatic!
Joined: Apr 2017
Posts: 1,120
Likes: 80
From: Tampa Bay, FL
05 E55, 98 CLK320
Thread Starter
MBWorld Fanatic!
Joined: Apr 2017
Posts: 1,120
Likes: 80
From: Tampa Bay, FL
05 E55, 98 CLK320
Ball joints I will check then. It's weird that it might be that...
Flex discs are brand new OEM parts too.
Sometimes like I said though the vibration isn't there, it's smooth sailing even if I gun it. I don't get it, it's like some vibration just appears, maybe like the engine is starved of oil?
You know how racecars need to be warmed up with revving otherwise they develop a vibration? Maybe it's something like that. At any rate this is straight up killing me and makes me feel like I shouldn't invest any more money in the car. I will have to go to another shop and investigate.
Flex discs are brand new OEM parts too.
Sometimes like I said though the vibration isn't there, it's smooth sailing even if I gun it. I don't get it, it's like some vibration just appears, maybe like the engine is starved of oil?
You know how racecars need to be warmed up with revving otherwise they develop a vibration? Maybe it's something like that. At any rate this is straight up killing me and makes me feel like I shouldn't invest any more money in the car. I will have to go to another shop and investigate.
Super Member
Joined: Sep 2016
Posts: 804
Likes: 62
E55 amg
Ball joints I will check then. It's weird that it might be that...
Flex discs are brand new OEM parts too.
Sometimes like I said though the vibration isn't there, it's smooth sailing even if I gun it. I don't get it, it's like some vibration just appears, maybe like the engine is starved of oil?
You know how racecars need to be warmed up with revving otherwise they develop a vibration? Maybe it's something like that. At any rate this is straight up killing me and makes me feel like I shouldn't invest any more money in the car. I will have to go to another shop and investigate.
Flex discs are brand new OEM parts too.
Sometimes like I said though the vibration isn't there, it's smooth sailing even if I gun it. I don't get it, it's like some vibration just appears, maybe like the engine is starved of oil?
You know how racecars need to be warmed up with revving otherwise they develop a vibration? Maybe it's something like that. At any rate this is straight up killing me and makes me feel like I shouldn't invest any more money in the car. I will have to go to another shop and investigate.
Super Member
Joined: Jan 2007
Posts: 979
Likes: 38
From: South Africa
2018 E63s AMG (Current) 2011 CL63 AMG (Sold) 2005 CLS55 AMG (Sold) 2004 C32 AMG (Sold)
Do you have headers on the car? Under WOT these can vibrate pretty bad feeling it through the footwell. Doesn't explain the vibration though when you not on the gas.
MBWorld Fanatic!
Joined: Jul 2014
Posts: 3,332
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2005 e55 AMG
All
When I'm on the highway between 70-140mph I tend to have this vibration especially vivid when I get on the pedal a bit more. Sometimes I'd be cruising between 70-80mph and the vibration is non existent, other times it feels like the car is bouncing up and down at the engine bay, I can feel it in the gas pedal as well.
How can I determine what it is? If it's a missfire???
It seems to fall under the same range that I have a vibration at idle (in park that is) between 1800-2400 rpm which to me seems like either one of the pistons/cylinders is damaged or I have a missfire of some sort.
No codes whatsoever. Again the weird part is that sometimes the vibration is there sometimes it isn't. I also have a leak at the rear main seal if that helps...
I have new poly mounts, they were installed at a shop though so I can't make a comment. I think the vibration was there even with the old mounts.
When I'm on the highway between 70-140mph I tend to have this vibration especially vivid when I get on the pedal a bit more. Sometimes I'd be cruising between 70-80mph and the vibration is non existent, other times it feels like the car is bouncing up and down at the engine bay, I can feel it in the gas pedal as well.
How can I determine what it is? If it's a missfire???
It seems to fall under the same range that I have a vibration at idle (in park that is) between 1800-2400 rpm which to me seems like either one of the pistons/cylinders is damaged or I have a missfire of some sort.
No codes whatsoever. Again the weird part is that sometimes the vibration is there sometimes it isn't. I also have a leak at the rear main seal if that helps...
I have new poly mounts, they were installed at a shop though so I can't make a comment. I think the vibration was there even with the old mounts.
Make sure all the coil pack connectors are on tight. Did you check the compression and compare it to another cylinder? If it's dead the block/piston are all done and would really suck.
Senior Member
Joined: Jan 2016
Posts: 270
Likes: 30
From: Northeast
2005 E55 | 1968 Road Runner
Man you are all over the map as usual with this poor car. First off you state that you don't even know if the problem was there before the mounts so could be mount related.You also say the car is "bouncing" up and down. That could be tire related if the car is "bouncing".You also say the car "seems" to vibrate at idle. Doe's it or not? A leaking rear main seal / No bearing on any thing like a vibration. Dead cylinder number 8? YES ! A miss fire WOULD more than likely be an issue.
Make sure all the coil pack connectors are on tight. Did you check the compression and compare it to another cylinder? If it's dead the block/piston are all done and would really suck.
Make sure all the coil pack connectors are on tight. Did you check the compression and compare it to another cylinder? If it's dead the block/piston are all done and would really suck.
Thread Starter
MBWorld Fanatic!
Joined: Apr 2017
Posts: 1,120
Likes: 80
From: Tampa Bay, FL
05 E55, 98 CLK320
Man you are all over the map as usual with this poor car. First off you state that you don't even know if the problem was there before the mounts so could be mount related.You also say the car is "bouncing" up and down. That could be tire related if the car is "bouncing".You also say the car "seems" to vibrate at idle. Doe's it or not? A leaking rear main seal / No bearing on any thing like a vibration. Dead cylinder number 8? YES ! A miss fire WOULD more than likely be an issue.
Make sure all the coil pack connectors are on tight. Did you check the compression and compare it to another cylinder? If it's dead the block/piston are all done and would really suck.
Make sure all the coil pack connectors are on tight. Did you check the compression and compare it to another cylinder? If it's dead the block/piston are all done and would really suck.
Sometimes at WOT or cruising between 70 and 140mph the car does not vibrate
Sometimes at WOT or cruising between 70 and 140mph the car vibrates
It's not the wheels I had them checked
It might be a bearing that plays along at times?
It might be a ball joint?
Or it might be a missfire
Thread Starter
MBWorld Fanatic!
Joined: Apr 2017
Posts: 1,120
Likes: 80
From: Tampa Bay, FL
05 E55, 98 CLK320
+1 on all this. Have to be as specific as possible to nail it down. Way too many moving parts. Driveshaft carrier bearing, flex discs, etc. should all be checked. I had a loose coil pack that corrected a modest vibration recently...found it by dumb luck poking around the engine bay but it was VERY loose. No idea how it got that way.
What I've read though is that there are multiple people with idle vibration between 1800-2400rpm which turns out to be the exact rev range I seem to have issues. This happens while I'm cruising and WOT, there's not real distinction. Sometimes it does, sometimes it doesn't. If I drive the car nicely there won't be a vibration, if I start flooring it around then it'll appear on the highway. Truly something I can't wrap my mind around.
What should be my course of action? Remove all spark plugs and look at them? Is there an efficient way to test the coil packs?
MBWorld Fanatic!
Joined: Oct 2015
Posts: 1,811
Likes: 282
From: SC
2005 E55 AMG
Get rid off those “solid” engine mounts you said you installed. Put new OEM mounts on. And relax all the engine/trans/exhaust mounting points on the car. Someone recently posted the thread on the process. Then see if it’s still there......post your findings when you’re done.
