M271.860 engine shaking
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E200 CGI blueefficiency 2010 W212
M271.860 engine shaking
Hello All, i own a w212 M271.860 Evo engine i have a vibration issue which is weird the rpm is stable but i get the shaking sensation especially with high rpms and is much noticed at idle, and also when changing gears from P to R or D i get this vibration for a second at the time and it disappears but still there is vibration. i checked my car’s compression is great ,done some vacuum tests, i replaced the fuel pump , injectors , coil pack , spark plugs , all the pulleys two idler pulleys and tensioner checked all the other pulleys and the freewheel clutch alternator pulley is great they appear to be in good shape except for harmonic balancer. Even the timing chain and cams and adjusters are okay.
The car is a 2010 with 40k km , what i notice is the tensioner pulley is swinging excessively and the harmonic balancer wobbles a bit with high rpms and noticed well with car full load like steering ac compressor and alternator with it, anyhow i visually inspected the balancer no visual damage but the rubber is extremely hard it’s tough as steel and when i scratch it with my nail i get a feeling of it tearing like ash ,and also their appears to be an oil leak from the seal behind the harmonic balancer do you think it’s the harmonic balancer that might be the issue?
The car is a 2010 with 40k km , what i notice is the tensioner pulley is swinging excessively and the harmonic balancer wobbles a bit with high rpms and noticed well with car full load like steering ac compressor and alternator with it, anyhow i visually inspected the balancer no visual damage but the rubber is extremely hard it’s tough as steel and when i scratch it with my nail i get a feeling of it tearing like ash ,and also their appears to be an oil leak from the seal behind the harmonic balancer do you think it’s the harmonic balancer that might be the issue?
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2015 E250 Bluetec
Motor mounts are well known to go early on all engines in the W212. The fluid filled design offers excellent performance at the expense of longevity. Given this common problem I’d say that Occam’s Razor recommends a thorough inspection of the motor and transmission mounts before suspecting the harmonic balancer or other engine components. Good luck and let us know what you find!
Thread Starter
Junior Member
Joined: Aug 2018
Posts: 67
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E200 CGI blueefficiency 2010 W212
Motor mounts are well known to go early on all engines in the W212. The fluid filled design offers excellent performance at the expense of longevity. Given this common problem I’d say that Occam’s Razor recommends a thorough inspection of the motor and transmission mounts before suspecting the harmonic balancer or other engine components. Good luck and let us know what you find!
Thread Starter
Junior Member
Joined: Aug 2018
Posts: 67
Likes: 28
E200 CGI blueefficiency 2010 W212
Motor mounts are well known to go early on all engines in the W212. The fluid filled design offers excellent performance at the expense of longevity. Given this common problem I’d say that Occam’s Razor recommends a thorough inspection of the motor and transmission mounts before suspecting the harmonic balancer or other engine components. Good luck and let us know what you find!
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E200 CGI blueefficiency 2010 W212
Okay today i found a vacuum leak from the output of the turbo charger there appears to be seal within the hose connecting to the output of the turbo charger that has gone bad, and the harmonic balancer as well seems wrecked my country suffers from extreme heat it would explain the rubber components of the vehicle going bad i replaced almost every seal of the vehicle the ones remaining are the harmonic balancer seal and the seals for the turbo hoses i will get them replaced along with a new harmonic balancer and belt, but what still bothers me the rough engine while cold starting i think it might be something to do with the quality of fuel or quality of oil because i already checked the intake manifold air filter. The car was even parked for almost 4 months because of the corona virus lockdown, I’ll replace the parts that needs replacing hopefully this will solve the vibration issue and I’ll keep an eye for the cold starting thingy.
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E200 CGI blueefficiency 2010 W212
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From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Okay today i found a vacuum leak from the output of the turbo charger there appears to be seal within the hose connecting to the output of the turbo charger that has gone bad, and the harmonic balancer as well seems wrecked my country suffers from extreme heat it would explain the rubber components of the vehicle going bad i replaced almost every seal of the vehicle the ones remaining are the harmonic balancer seal and the seals for the turbo hoses i will get them replaced along with a new harmonic balancer and belt, but what still bothers me the rough engine while cold starting i think it might be something to do with the quality of fuel or quality of oil because i already checked the intake manifold air filter. The car was even parked for almost 4 months because of the corona virus lockdown, I’ll replace the parts that needs replacing hopefully this will solve the vibration issue and I’ll keep an eye for the cold starting thingy.
**but what still bothers me the rough engine while cold starting i think it might be something to do with the quality of fuel or quality of oil because i already checked the intake manifold air filter.**
If it is a 10-15 seconds event, no worry. The computers need time to read stabilized sensors to get better combustion.
What usually happens to gasoline when kept too long ( say ur 4 moths Covid lockdown ) is it will oxidized and create varnish like coating.
My portable 1kw inverter honda gasoline genset, I drain the fuel tank and run till dry the caburator when going for storage.
The varnish will block the caburator jetting and in boats, varnish on fuel tank walls ican clog fuel suction hoses + check valves in the fuel filters, if the fuel is left too long like a year or so.
After about 3 months, gasoline looses its proper properties, my countryman call it stale fuel. Its also not good for combustion.
https://www.bp.com/content/dam/bp/co...gehandling.pdf
If you can get some sort of fuel treatment chemical to remove the varnish and do a low gear ( if your transmission allows ) to get 4,000 - 5,000 RPM all the time for say 5 minutes,
it will help to clean some minor blockage in the injection system. Do it on the road and not by stand still and throttle.
Happy troubleshooting...........
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E200 CGI blueefficiency 2010 W212
Good info on the heat accelerated wear and tear. It is no suprise, I am in th tropics and bumper to bumper traffic jam do aged rubber/plastic components in engine bay FAST.
**but what still bothers me the rough engine while cold starting i think it might be something to do with the quality of fuel or quality of oil because i already checked the intake manifold air filter.**
If it is a 10-15 seconds event, no worry. The computers need time to read stabilized sensors to get better combustion.
What usually happens to gasoline when kept too long ( say ur 4 moths Covid lockdown ) is it will oxidized and create varnish like coating.
My portable 1kw inverter honda gasoline genset, I drain the fuel tank and run till dry the caburator when going for storage.
The varnish will block the caburator jetting and in boats, varnish on fuel tank walls ican clog fuel suction hoses + check valves in the fuel filters, if the fuel is left too long like a year or so.
After about 3 months, gasoline looses its proper properties, my countryman call it stale fuel. Its also not good for combustion.
https://www.bp.com/content/dam/bp/co...gehandling.pdf
If you can get some sort of fuel treatment chemical to remove the varnish and do a low gear ( if your transmission allows ) to get 4,000 - 5,000 RPM all the time for say 5 minutes,
it will help to clean some minor blockage in the injection system. Do it on the road and not by stand still and throttle.
Happy troubleshooting...........
**but what still bothers me the rough engine while cold starting i think it might be something to do with the quality of fuel or quality of oil because i already checked the intake manifold air filter.**
If it is a 10-15 seconds event, no worry. The computers need time to read stabilized sensors to get better combustion.
What usually happens to gasoline when kept too long ( say ur 4 moths Covid lockdown ) is it will oxidized and create varnish like coating.
My portable 1kw inverter honda gasoline genset, I drain the fuel tank and run till dry the caburator when going for storage.
The varnish will block the caburator jetting and in boats, varnish on fuel tank walls ican clog fuel suction hoses + check valves in the fuel filters, if the fuel is left too long like a year or so.
After about 3 months, gasoline looses its proper properties, my countryman call it stale fuel. Its also not good for combustion.
https://www.bp.com/content/dam/bp/co...gehandling.pdf
If you can get some sort of fuel treatment chemical to remove the varnish and do a low gear ( if your transmission allows ) to get 4,000 - 5,000 RPM all the time for say 5 minutes,
it will help to clean some minor blockage in the injection system. Do it on the road and not by stand still and throttle.
Happy troubleshooting...........
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E200 CGI blueefficiency 2010 W212
Okay i think i might be getting into something, i noticed this issue appears after the car sits 3 weeks parked and the battery is drained, once i charge the battery with a trickle charger and then start the car and resume my normal routine driving there’s no issue, but if the car sits for a couple of days i have to recharge it and the issue disappears. One last thing i am using a battery of 100ah 800cca, but today i used the epc with my vin and found out that i should have installed a 60 ah battery only, could it somehow because i installed a much larger battery than needed it somehow affecting the system knowing that my car is equipped with that smart charging mechanism?
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From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
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E200 CGI blueefficiency 2010 W212
okay could a combination of a stretched serpentine belt and bad harmonic balancer be the issue? I noticed that my tensioner pulley is vibrating but i have already replaced it, but i took a look on the harmonic balancer and it was vibrating excessively the rubber became extremely stiff and it seems that the rubber is slipping from one side of the pulley plus the engine front seal behind the pulley is leaking oil, and it seems it’s vibrating much worse when there is load put on the engine. And could it affect the working of the other accessories connected by the belt?
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From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Well, if indeed you have a bad harmonic balancer, that surely cause the shaky-shaky and any other equipment sharing the same sepentine belt with it would also be forced to shake a bit.
Serpentine belt itself is forgiving ( very flexible ), it is not a hard shaft and will NOT deliver vibration like a shaft.... nevertheless seperntine belt works on friction and it needs all the belt grooves to sit properly ( don't shake it ) on all spinning equipment.
Serpentine belt itself is forgiving ( very flexible ), it is not a hard shaft and will NOT deliver vibration like a shaft.... nevertheless seperntine belt works on friction and it needs all the belt grooves to sit properly ( don't shake it ) on all spinning equipment.
Thread Starter
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E200 CGI blueefficiency 2010 W212
Well, if indeed you have a bad harmonic balancer, that surely cause the shaky-shaky and any other equipment sharing the same sepentine belt with it would also be forced to shake a bit.
Serpentine belt itself is forgiving ( very flexible ), it is not a hard shaft and will NOT deliver vibration like a shaft.... nevertheless seperntine belt works on friction and it needs all the belt grooves to sit properly ( don't shake it ) on all spinning equipment.
Serpentine belt itself is forgiving ( very flexible ), it is not a hard shaft and will NOT deliver vibration like a shaft.... nevertheless seperntine belt works on friction and it needs all the belt grooves to sit properly ( don't shake it ) on all spinning equipment.
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E200 CGI blueefficiency 2010 W212
couldn’t agree more, but the belt itself wasn’t replaced for almost 6 years and the average temperature in my country is 50 degrees Celsius, the belt feels loose and stretched with some cracks, i compared it to a new belt and there is a difference and also it seems that age and heat has hardened it in comparison with a new belt. One lost last thing i forgot to tell that the shaky sensation increases with increasing outside temperature, as it seems that temperature has an affect on the faulty harmonic balancer plus the harmonic balancer is covered with some oil leaking from the front seal behind it.
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From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
my country’s temperature is harsh on these rubber components, i had to replace many rubber seals because oil was leaking all over. some of which include the oil cooler seals, the intake seals , the o ring seals found at the boost hoses clamps, engine cover gasket, spark plug seals, all those parts were leaking oil all over the engine and it seems that they went bad at almost the same time. As well as motor mounts and transmission mounts. The only remaining faulty component with rubber in it is the harmonic balancer.
In my country, Audi transmission-control-module cant last to.
Last edited by S-Prihadi; Aug 17, 2020 at 05:22 AM. Reason: add info
Thread Starter
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E200 CGI blueefficiency 2010 W212
Thread Starter
Junior Member
Joined: Aug 2018
Posts: 67
Likes: 28
E200 CGI blueefficiency 2010 W212
Last edited by Wail maghazi; Aug 17, 2020 at 05:40 AM.
