Pinging/Knocking/Detonation? Sounds like rocks in the engine on acceleration..

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May 23, 2017 | 11:53 AM

Hapa88

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2017 C300 Coupe (C205)

Pinging/Knocking/Detonation? Sounds like rocks in the engine on acceleration..

So my wife has a 2017 C300 Coupe with the 2.0L Turbo motor. Lately she's been complaining about intermittent knocking/pinging sound that happens when she does a moderately aggressive acceleration (like getting on the freeway or passing someone, about 3/4 throttle). I drove her car the last week and tried and tried to get it to do it and was only successful once.

It basically sounds like engine knocking to me. You get on the accelerator and it immediately starts to sound like rocks are flinging around in the motor. As soon as you let off on the gas, and get back on it the sound goes away. Has anyone else had this problem?

Couple of notes: Car is a 2017 C300 Coupe, 2.0L Turbo motor, about 4500 miles. Uses 91 Octane gas (highest available in Tucson, AZ). Tucson elevation is ~2400 ft above sea level. Outside temps around the 80 degree F range. Car is in "Comfort" mode when it happens.

May 25, 2017 | 08:29 AM

Grobas

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Honda S2000

Mate, your wife's car is new and still on the warranty, just do not invent wheel and go for warranty service.

May 25, 2017 | 10:48 AM

Hapa88

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2017 C300 Coupe (C205)

Quote:

Originally Posted by Grobas

Mate, your wife's car is new and still on the warranty, just do not invent wheel and go for warranty service.

Easier said than done, sir. We're not exactly close to a MB dealership, so taking it in isn't the easiest solution. Was hoping someone else had the problem and could shed some light on the situation.

Also, knowing that it's intermittent, there's about a 99.9% chance that the dealership won't experience the problem at all while they have it, and hand it back to us.

May 25, 2017 | 02:14 PM

tblountman

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From: south florida

GTC Roadster

Right off the top of my head all I can think is maybe bad gas?

May 26, 2017 | 10:56 AM

Hapa88

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Joined: Sep 2005

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2017 C300 Coupe (C205)

Quote:

Originally Posted by tblountman

Right off the top of my head all I can think is maybe bad gas?

My thought too, but its happened over multiple tanks of gas.. though she does get gas from the same place across the street from our house, so I asked her to try a different spot and we'll see.