Urgent question about my W204's engine

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RF62
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Model you own: w204

Urgent question about my W204's engine

Post by RF62 » Sun 17 Dec, 2017 1:35 am

Hi!

I did something very stupid to my C class W204 tonight and wanted to see if I harmed the engine or not! :banghead:
I am generally very obsessive with my cars. I saw there is a little bit of black dust stuck on my W204's exhaust pipe, where the gas exits the pipe (just a little bit at the end of the pipe- the lower part). I thought maybe my engine is not running well and the black dust comes from that. Therefore, I left the engine running for about 5 minutes (when the engine was warm) and asked my neighbor to push the accelerator pedal 3 times, each time a little bit harder. The first two times, he pushed the pedal and there was no colored smoke coming out of the exhaust. Everything seemed fine. The problem was with the 3rd time!

I think he pushed the pedal very hard the third time. A little bit of white smoke came out of the engine and he suddenly said that the accelerator pedal is not working! I think he had pushed it so hard that the engine had to cut the accelerator, so it does not over rev! I sat in the car and realized the accelerator is not working. Also, the cluster was showing all sorts of warnings. From flat tyre to other stuff (actually, was saying that non of them are working)! I turned the engine off and on again, and everything was normal.

So, now my questions are:
1- Am I correct regarding what has happened? Did the car cut-off the power?
2- Did I harm the engine or it would be fine since it was just once?
3- What was that little bit of white smoke?
4- Why was the car showing all sorts of warnings? Did it think the car is slipping or something like that?

I am so worried, since I love this car and it is beautiful. I've done all services on time, it ran perfectly and I might have harmed it by putting my neighbour behind the wheel without telling him not to go over a certain rpm!

Thanks

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T-Modell
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Re: Urgent question about my W204's engine

Post by T-Modell » Sun 17 Dec, 2017 2:26 am

Hi,
I wouldn't worry, if now everything's alright. I guess the only possibility to harm an engine with the accelerator pedal is to stand on it for half an hour while not moving :whistle:

I'd relax and next time you pass by Mercedes, have the error log checked. Maybe the car doesn't like your neighbour :laughing6:

All the best
Thomas
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John Green
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Re: Urgent question about my W204's engine

Post by John Green » Sun 17 Dec, 2017 8:43 am

All modern engines have two factory set rev limits. One for not in gear and anther for in gear. The in gear one is obvious as it is displayed on the rev counter (tachometer). The not in gear one is not so obvious and can only be found by doing what you just did, most are in the 3000-3500 range. At this point the engine will simply cut out and then cut back in again when it has slowed down a little.

That doesn't explain all the lights, which are no normal.
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RF62
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Joined: Wed 13 Dec, 2017 11:48 pm
Model you own: w204

Re: Urgent question about my W204's engine

Post by RF62 » Mon 18 Dec, 2017 12:38 pm

Thanks to both of you!

Unfortunately, I didn't get notifications regarding your replies to my post (bad forum! :whip: ). Therefore, today I contacted 4 different Mercedes specialists including Silver Star Motors, Mercedes Benz Melbourne, Ammstar and Prestige Auto. :Doh:

Apart from Mercedes Benz Melbourne that redirected me several times and then wanted to book the car in right away, and Ammstar which I am still waiting for their mechanic to call back, the 2 others were helpful and as you mentioned, told me this is not normal and shouldn't have happened. But I should drive the car and go to them if it happens again! :error:

Regardless of this, I will book the car in with the most well-informed service center on this issue (of course, I have a positivish experience with the Ammstar from before).

RF62
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Posts: 14
Joined: Wed 13 Dec, 2017 11:48 pm
Model you own: w204

Re: Urgent question about my W204's engine

Post by RF62 » Mon 18 Dec, 2017 3:42 pm

:stop: Quick question: one of my friends says this has happened because we did not build up the power and pushed the accelerator pedal too much at once. He says this had given the car (which is almost 10 years old) a shock. Do you think this might be the reason?

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Ivanerrol
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Re: Urgent question about my W204's engine

Post by Ivanerrol » Mon 18 Dec, 2017 7:16 pm

How's your battery?
How old is it?
The battery acts as a calming filter for the alternator output.
You have a bunch of computers with a car around it.
Maybe?????? Sudden full output of the alternator caused the ECU's to have a seizure. - conjecture only.

I just replaced the battery in my W204 today.
DIN77 $200.00 Exide HMF.
Miraculously the engine miss at cold has gone away.
Old battery dated 09/2008.
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RF62
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Re: Urgent question about my W204's engine

Post by RF62 » Tue 19 Dec, 2017 5:24 pm

What you mentioned is very interesting! It makes sense as my battery is quite old! Have you read my previous post about my friend's theory on shocking the engine? That also seemed possible.

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