Weird acceleration shudder
Thread Starter
Junior Member
Joined: Jun 2025
Posts: 16
Likes: 2
From: Georgia, and Texas
13’ GL63 AMG, 17’ GLS550, 14’ F-150 FX4, 13’ Scion FR-S, 97’ Toyota Crown Royal & 17' Durango R/T
Weird acceleration shudder
Hey y’all, so I drive a lot for work and normally I drive my F-150 for all of my road trips, however I have driven my GL63 on quite a few trips with the family and for work. Last week i had an odd issue pop up but narrowed it down to needed a transmission mount, replaced that yesterday and it was a night and day difference. I gingerly drove it back home when the problem occurred to avoid damages. Now I’m getting a strange acceleration shudder that I can’t seem to narrow down.
it somewhat feels like a misfire, but I’m not getting any codes, but it seems to occur while going uphill only for a second or two…and only under light acceleration. If I do moderate or heavy acceleration there’s no problem. Strange I know. I’m going to keep monitoring it, I have one of my scanners plugged in trying to see if I get a misfire on the monitor at all. I saw some say it was their fuel injector, some said spark plugs or coil packs…or even the torque converter. I’m annoyed because i am 8 hours from home, and on the way to work for the next week or two.
it somewhat feels like a misfire, but I’m not getting any codes, but it seems to occur while going uphill only for a second or two…and only under light acceleration. If I do moderate or heavy acceleration there’s no problem. Strange I know. I’m going to keep monitoring it, I have one of my scanners plugged in trying to see if I get a misfire on the monitor at all. I saw some say it was their fuel injector, some said spark plugs or coil packs…or even the torque converter. I’m annoyed because i am 8 hours from home, and on the way to work for the next week or two.
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Hey y’all, so I drive a lot for work and normally I drive my F-150 for all of my road trips, however I have driven my GL63 on quite a few trips with the family and for work. Last week i had an odd issue pop up but narrowed it down to needed a transmission mount, replaced that yesterday and it was a night and day difference. I gingerly drove it back home when the problem occurred to avoid damages. Now I’m getting a strange acceleration shudder that I can’t seem to narrow down.
it somewhat feels like a misfire, but I’m not getting any codes, but it seems to occur while going uphill only for a second or two…and only under light acceleration. If I do moderate or heavy acceleration there’s no problem. Strange I know. I’m going to keep monitoring it, I have one of my scanners plugged in trying to see if I get a misfire on the monitor at all. I saw some say it was their fuel injector, some said spark plugs or coil packs…or even the torque converter. I’m annoyed because i am 8 hours from home, and on the way to work for the next week or two.
it somewhat feels like a misfire, but I’m not getting any codes, but it seems to occur while going uphill only for a second or two…and only under light acceleration. If I do moderate or heavy acceleration there’s no problem. Strange I know. I’m going to keep monitoring it, I have one of my scanners plugged in trying to see if I get a misfire on the monitor at all. I saw some say it was their fuel injector, some said spark plugs or coil packs…or even the torque converter. I’m annoyed because i am 8 hours from home, and on the way to work for the next week or two.
Thread Starter
Junior Member
Joined: Jun 2025
Posts: 16
Likes: 2
From: Georgia, and Texas
13’ GL63 AMG, 17’ GLS550, 14’ F-150 FX4, 13’ Scion FR-S, 97’ Toyota Crown Royal & 17' Durango R/T
They’re in excellent condition. My uncle (previous owner) changed them at 80k miles. I’m starting to thing that bad gas is the problem. It’s driving almost perfect again, almost. Still keeping a watchful eye on it
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MBWorld Fanatic!
Joined: Feb 2017
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From: Baltimore County, MD
'13 s212 63 p30. '06 LX470
Hey y’all, so I drive a lot for work and normally I drive my F-150 for all of my road trips, however I have driven my GL63 on quite a few trips with the family and for work. Last week i had an odd issue pop up but narrowed it down to needed a transmission mount, replaced that yesterday and it was a night and day difference. I gingerly drove it back home when the problem occurred to avoid damages. Now I’m getting a strange acceleration shudder that I can’t seem to narrow down.
it somewhat feels like a misfire, but I’m not getting any codes, but it seems to occur while going uphill only for a second or two…and only under light acceleration. If I do moderate or heavy acceleration there’s no problem. Strange I know. I’m going to keep monitoring it, I have one of my scanners plugged in trying to see if I get a misfire on the monitor at all. I saw some say it was their fuel injector, some said spark plugs or coil packs…or even the torque converter. I’m annoyed because i am 8 hours from home, and on the way to work for the next week or two.
it somewhat feels like a misfire, but I’m not getting any codes, but it seems to occur while going uphill only for a second or two…and only under light acceleration. If I do moderate or heavy acceleration there’s no problem. Strange I know. I’m going to keep monitoring it, I have one of my scanners plugged in trying to see if I get a misfire on the monitor at all. I saw some say it was their fuel injector, some said spark plugs or coil packs…or even the torque converter. I’m annoyed because i am 8 hours from home, and on the way to work for the next week or two.
What kind of oil do you use? Are you experiencing LSPI? Or, perhaps in need of a vacuum check valve?
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Joined: Jun 2021
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From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
Two years ago after a hurricane our only option for fuel was "low grade"...we had almost exactly what you describe in three of our cars. Clean gas, issue went away (and had to reset the CEL in our GLS).
Thread Starter
Junior Member
Joined: Jun 2025
Posts: 16
Likes: 2
From: Georgia, and Texas
13’ GL63 AMG, 17’ GLS550, 14’ F-150 FX4, 13’ Scion FR-S, 97’ Toyota Crown Royal & 17' Durango R/T
yup, and we’ve been experiencing a ton of rain in Ga and other parts of the south. I’m still leaning towards doing a transmission service too though. It’s probably time for it’s second service anyway.
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Thread Starter
Junior Member
Joined: Jun 2025
Posts: 16
Likes: 2
From: Georgia, and Texas
13’ GL63 AMG, 17’ GLS550, 14’ F-150 FX4, 13’ Scion FR-S, 97’ Toyota Crown Royal & 17' Durango R/T
i use Liqui Moly oil. I was reading up on vacuum issues last night. I’ll be checking what i can for now while i can, but once home i can put it on my lift and go through it. Currently 15hrs away from home for the next week or two
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Thread Starter
Junior Member
Joined: Jun 2025
Posts: 16
Likes: 2
From: Georgia, and Texas
13’ GL63 AMG, 17’ GLS550, 14’ F-150 FX4, 13’ Scion FR-S, 97’ Toyota Crown Royal & 17' Durango R/T
smooth, just light load acceleration is when i get the shudder, heavy acceleration is fine. I’m somewhat feeling as though if it is within the fuel, it will be burned out sooner than later. I just usually don’t go below 1/4 tank…think i may have to and add a liquid moly fuel cleaner to be sure.
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MBWorld God!
Joined: Dec 2019
Posts: 32,217
Likes: 6,275
MBWorld God!
Joined: Dec 2019
Posts: 32,217
Likes: 6,275
Thread Starter
Junior Member
Joined: Jun 2025
Posts: 16
Likes: 2
From: Georgia, and Texas
13’ GL63 AMG, 17’ GLS550, 14’ F-150 FX4, 13’ Scion FR-S, 97’ Toyota Crown Royal & 17' Durango R/T
plugs and coils are new and OEM. The issue seems to have just about gone. Think it was bad fuel. When I get home though I’m doing my trans fluid and filter, diff fluids and transfer case fluids
Thread Starter
Junior Member
Joined: Jun 2025
Posts: 16
Likes: 2
From: Georgia, and Texas
13’ GL63 AMG, 17’ GLS550, 14’ F-150 FX4, 13’ Scion FR-S, 97’ Toyota Crown Royal & 17' Durango R/T
Just wanted to update everyone, it turns out that the torque converter needs to be flushed. That is happening in a few days. Also just got all of the trans fluid with the trans fluid change kit from FCP Euro. Vehicle shudder returns when you drive continuously for more than 3-4 hours at a steady speed. Had it properly diagnosed and that's the result. Hopefully I won't need to change the torque converter, just the fluid.
Out Of Control!!
Joined: Sep 2018
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From: unbegrenzt
2017 GLE350 4MATIC
Just wanted to update everyone, it turns out that the torque converter needs to be flushed. That is happening in a few days. Also just got all of the trans fluid with the trans fluid change kit from FCP Euro. Vehicle shudder returns when you drive continuously for more than 3-4 hours at a steady speed. Had it properly diagnosed and that's the result. Hopefully I won't need to change the torque converter, just the fluid.
MBWorld God!
Joined: Dec 2019
Posts: 32,217
Likes: 6,275
Just wanted to update everyone, it turns out that the torque converter needs to be flushed. That is happening in a few days. Also just got all of the trans fluid with the trans fluid change kit from FCP Euro. Vehicle shudder returns when you drive continuously for more than 3-4 hours at a steady speed. Had it properly diagnosed and that's the result. Hopefully I won't need to change the torque converter, just the fluid.
