Rough Idle and Shaking
Thread Starter
Super Member
Joined: Jan 2012
Posts: 564
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From: Australia
AMG
Rough Idle and Shaking
I've noticed in my wife's C63 that when it's been driven for a while during the day and it's hot, it shakes and the revs go up and down.
Also on idle i've noticed from standing on the outside of the car the idle keeps going up and down. The engine idle goes up and down.
Also i've noticed when the car is parked in traffic on a downhill it likes to shake when hot.
MAF Sensor?
Plugs? (they were changed 10 000km's ago)
02 Sensor?
Also on idle i've noticed from standing on the outside of the car the idle keeps going up and down. The engine idle goes up and down.
Also i've noticed when the car is parked in traffic on a downhill it likes to shake when hot.
MAF Sensor?
Plugs? (they were changed 10 000km's ago)
02 Sensor?
Thread Starter
Super Member
Joined: Jan 2012
Posts: 564
Likes: 1
From: Australia
AMG
Nothing has come up on the dash..
Can i get Mercedes to check for codes?
Also could it be exhaust leak? I don't know i just have a feeling that it could be an exhaust leak for some reason.
Can i get Mercedes to check for codes?
Also could it be exhaust leak? I don't know i just have a feeling that it could be an exhaust leak for some reason.
Last edited by RawBenz; Feb 15, 2015 at 03:46 AM.
MBWorld Fanatic!
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C63 AMG P30 *EuroCharged*| Porsche Cayenne | Buell XB9SX
Codes can still show up with a scanner even if it didn't trip the CEL. Here in the US, some stores will check for free. Or buy an OBD2 scanner and check it yourself. You can get an inexpensive one and I've found it very handy to have one.
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2010 C63 P30
and if youve bought a eurocharged tune then you already have a scanner in the mygenius unit.
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MBWorld Fanatic!
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2010 C63 P30
I don't remeber the exact options but there is a data capture mode in the menu, or called something similar like data log
i know it will capture information on the vehicle, pretty sure it would show codes.
i know it will capture information on the vehicle, pretty sure it would show codes.
Last edited by rentzington; Feb 15, 2015 at 06:21 PM.
In German mb forum some user had this problem too.....it was a faulty inlet manifold gasket.
Dont know it 100% in your chase but mb/amg has changed the part number of the gasket a couple of times
Dont know it 100% in your chase but mb/amg has changed the part number of the gasket a couple of times
Super Member
Joined: Dec 2012
Posts: 600
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From: Bay Area
2010 C63 P31 AMG
I just had my fuel check valve and fuel pumps changed out. Idling was rough and would have violent engine shakes that came along a check light. Concerning your issue, this could be a possibility. Would do a fuel pressure check and see how it is during idle.
Senior Member
Joined: Sep 2014
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From: Calgary, AB
2011 C63 AMG P31
Mine had that issue. Didn't rattle, but it was always searching for idle RPM, and would go into limp when pushed hard.
Junior Member
Joined: Jul 2013
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2008 C63
I just went through a similar symptom....turned out to be 2 bad throttle actuators for me. RPM's would bounce while driving, car would go into limp mode while driving.... Sometimes my CEL would come on, sometimes it wouldn't.
Thread Starter
Super Member
Joined: Jan 2012
Posts: 564
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From: Australia
AMG
Took the car to mercedes, checked for codes and it was all clear.
No codes at all.
Still notice by standing outside the car that the engine revs keep going up and down.
Needle only moves slightly, but you can hear the engine isn't stable on a certain rpm. It keeps fluctuating up and down..
It sounds like someone is slightly putting their foot on the accelerator then letting go, and repeating.
No codes at all.
Still notice by standing outside the car that the engine revs keep going up and down.
Needle only moves slightly, but you can hear the engine isn't stable on a certain rpm. It keeps fluctuating up and down..
It sounds like someone is slightly putting their foot on the accelerator then letting go, and repeating.
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C63 AMG
When my car went into limp mode and I pulled the plugs Bank 1 had been shut down completely. Only Bank 2 fired, so it was no surprise the engine had no power whatsoever and was massively lumpy in operation. Is that standard limp mode operation or are there different limp modes based on what the codes indicate?
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From: Denham Springs,LA
'12 C63 Black Series, '12 ML350 BlueTech
Took the car to mercedes, checked for codes and it was all clear.
No codes at all.
Still notice by standing outside the car that the engine revs keep going up and down.
Needle only moves slightly, but you can hear the engine isn't stable on a certain rpm. It keeps fluctuating up and down..
It sounds like someone is slightly putting their foot on the accelerator then letting go, and repeating.
No codes at all.
Still notice by standing outside the car that the engine revs keep going up and down.
Needle only moves slightly, but you can hear the engine isn't stable on a certain rpm. It keeps fluctuating up and down..
It sounds like someone is slightly putting their foot on the accelerator then letting go, and repeating.
