b180 petrol starting problem - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 03-09-2012, 08:28 AM Thread Starter
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b180 petrol starting problem

Good day
I am the owner of a 2011 b180 petrol with cvt transmission car. Since out of the showroom, I have been getting a starting problem. At my first start in the morning there is a very pronounced hesititation (as the rpm goes from high to idle speed). This occurs while car is standstill. There is also some hesitation as the car first moves off. Sent the car into agency to be checked out, but they said everything is fine. What could be the problem?
Can anyone help?
P.S. Check engine light does not come on. For the rest of the day, the car starts well.
Regards
mmctrinidad
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post #2 of 11 (permalink) Old 03-10-2012, 03:58 AM
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Welcome to Benzworld, I think you are not used to Mercedes cars. When first starting the engine from cold the rpm will stay high for a very short period of time, this is the "warm up" period and then the rpm will drop to the correct idle speed, it is normal.

ERIC.

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post #3 of 11 (permalink) Old 03-12-2012, 07:11 AM Thread Starter
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you misunderstood my problem

Good day
From high rpm going down to low rpm on a cold start, there are a few hesitiations ( or bucks) in the rpm. I was able to cold start another b180 last week and this issue did not arise.
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mmctrinidad
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post #4 of 11 (permalink) Old 03-12-2012, 07:20 AM
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Originally Posted by mmctrinidad View Post
Good day
From high rpm going down to low rpm on a cold start, there are a few hesitiations ( or bucks) in the rpm. I was able to cold start another b180 last week and this issue did not arise.
Regards
mmctrinidad
OK I understand better, first of all put a small bottle of fuel booster in the fuel tank and see if that improves the situation. Does sound like bad fuel to me.

ERIC.

___________________________________________
"I am enclosing two tickets to the first night of my new play; bring a friend, if you have one."
- George Bernard Shaw to Winston Churchill.

"Cannot possibly attend first night, will attend second ... if there is one."
- Winston Churchill, in response.
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post #5 of 11 (permalink) Old 03-12-2012, 10:23 AM Thread Starter
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Thanks for the advice

Good day
Thanks for the advice. Since I bought the car from the showroom last year August, I have tried fuel injector treatments, Fuel boosters and no change. This problem was noticed the day after I bought the car. The fuel in Trinidad supposedly has ron 95 and mon 91. Should be good enough for the car.
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mmctrinidad
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post #6 of 11 (permalink) Old 03-12-2012, 10:31 AM
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Originally Posted by mmctrinidad View Post
Good day
Thanks for the advice. Since I bought the car from the showroom last year August, I have tried fuel injector treatments, Fuel boosters and no change. This problem was noticed the day after I bought the car. The fuel in Trinidad supposedly has ron 95 and mon 91. Should be good enough for the car.
Regards
mmctrinidad
97 ron min.

ERIC.

___________________________________________
"I am enclosing two tickets to the first night of my new play; bring a friend, if you have one."
- George Bernard Shaw to Winston Churchill.

"Cannot possibly attend first night, will attend second ... if there is one."
- Winston Churchill, in response.
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post #7 of 11 (permalink) Old 03-12-2012, 10:35 AM Thread Starter
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Thanks

Will boost to 97 and observe.
Regards
mmctrinidad
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post #8 of 11 (permalink) Old 03-12-2012, 10:41 AM
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Will boost to 97 and observe.
Regards
mmctrinidad

It really depends on the fuel quality, these engines were designed with German fuel qualities and refining in mind. I live in China and even 97 ron requires the odd bottle of booster. It is shit fuel and I am fed up with it but what can we do. I am a Benz Tech and not an old fool, but this is frustrating to say the least.

ERIC.

___________________________________________
"I am enclosing two tickets to the first night of my new play; bring a friend, if you have one."
- George Bernard Shaw to Winston Churchill.

"Cannot possibly attend first night, will attend second ... if there is one."
- Winston Churchill, in response.
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post #9 of 11 (permalink) Old 03-12-2012, 10:48 AM Thread Starter
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I hear you. Thank for the info.
mmc
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post #10 of 11 (permalink) Old 03-13-2012, 12:48 AM
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Very good!
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