2013 C350 4Matic Start-up rattle?
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2013 Mercedes Benz C350
2013 C350 4Matic Start-up rattle?
Hi all, basically what the title says. Today, I decided to record my car's cold start (after leaving it overnight in a garage at approximately 20 Celsius) and it appears that my car has the infamous engine start rattle (see the link below). Would you guys be able to help me verify that? The video was recorded by placing my phone in the area above the radiator / fan. I have noticed a slight rattle during some warm starts (after leaving the car at the store for ~30 minutes but never noticed a cold start rattle inside from inside the cabin until I recorded this video. Also, should I get this issue addressed asap or can it wait until approximately a year from now? The goal is not just to replace the chain tensioners but also to fix a possible leak from the valve covers as well as the timing sensors. Since I bought the car over a year ago, I have also been experiencing vibrations at idle, with RPMs going up and down by around 100 RPM. I feel like this issue has been beaten to death with all the threads that have been created in the past, but I still thought it would be a good idea to ask around in this forum before going to a mechanic.
Joined: Nov 2016
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From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Are you talking about the fast clicking sound? Sounds just like mine. Sounds like the HPFP to me. See if the noise is louder near the back passenger side of the engine. I'm not saying there's no problem, just that it sounds like mine.
Thread Starter
Junior Member
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2013 Mercedes Benz C350
I'm concerned about the sound that can be heard for the first 2-3 seconds after the engine turns on... unless that is the same sound that you were thinking. Also since you mention the HPFP, the ticking sound that can be heard while the engine is running is usually more pronounced on the right side of the engine than the left.
Joined: Nov 2016
Posts: 7,847
Likes: 3,496
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
I'm concerned about the sound that can be heard for the first 2-3 seconds after the engine turns on... unless that is the same sound that you were thinking. Also since you mention the HPFP, the ticking sound that can be heard while the engine is running is usually more pronounced on the right side of the engine than the left.
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2013 Mercedes Benz C350
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2008 E350, 2012 ML350, 2014 E350, 2015 ML350
Have you unplugged the oil pump solenoid? If not, worth at least unplugging for a short test. If the noise comes down even faster, likely the chain tensioners are "tired".
Your decision to plug it back regardless of the test results.
Definitely, the engine has a subtle noise.
By any chance, have you scanned the vehicle? Any codes?
Your decision to plug it back regardless of the test results.
Definitely, the engine has a subtle noise.
By any chance, have you scanned the vehicle? Any codes?
Last edited by JCM_MB; Sep 7, 2024 at 09:10 PM.
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Thread Starter
Junior Member
Joined: Sep 2023
Posts: 37
Likes: 2
2013 Mercedes Benz C350
Have you unplugged the oil pump solenoid? If not, worth at least unplugging for a short test. If the noise comes down even faster, likely the chain tensioners are "tired".
Your decision to plug it back regardless of the test results.
Definitely, the engine has a subtle noise.
By any chance, have you scanned the vehicle? Any codes?
Your decision to plug it back regardless of the test results.
Definitely, the engine has a subtle noise.
By any chance, have you scanned the vehicle? Any codes?
