knocking
MBWorld Fanatic!
Joined: Sep 2015
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2013 glk 350
You need direct the sound to your ear and then locate the sound, a simple broom handle or pole touching your ear and the motor will help you locate the sound. You can buy a Auto stethoscope for this but a pole will do the same thing.
Junior Member
Joined: Apr 2018
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2011 GLK350
Never heard of a solid rod, I prefer using a hollow copper water pipe, sound travels inside it really nicely. But a $10 automotive stethoscope really can't be beat.
Newbie
Joined: Sep 2021
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2010 GLK 350 4matic
Same ticking noise when starting 2010 glk 350
did you ever find out what it was. My 2010 GLK 350 4matic with 133000 also makes a loud ticking noise when I start it in the morning. The colder it is outside the louder it gets.
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2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
Sounds like a bit of excessive play somewhere in the valve train. At 133k a bit of wear can lead to a temperature sensitive ticking that goes away as the parts heat up. As long as it goes away, or gets much better, as the engine warms up, it’s not a problem.
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2010 GLK 350 4matic
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2011 GLK 350 4Matic
I'd suggest spending a few (literally) dollars and buy a mechanic's stethoscope. Harbor Freight has a workable one for around $5. With it, you can find the actual source of a mechanical noise (or at least eliminate the things that aren't a problem). There are a whole lotta moving parts in play and many of them could potentially make the noises you describe.
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Senior Member
Joined: Feb 2020
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From: Lac Ste. Marie, Quebec
2006 Alfa Romeo Brera, 2010 GLK350, 2018 BMW 640i GT, 1997 Subaru SVX, 2012 Moto Guzzi Norge GT8V
My 2010 GLK350 is the opposite. It's quiet when cold and ticks once it's heated up. In over 3 years of ownership the sound hasn't changed. I just call it the Mercedes sound. Our BMW is silent.
Newbie
Joined: Feb 2017
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GLK350
Had the same issue. In Canada, this was the part replaced and Cost.
Secondary Air Pump
Remove and Replace components as required to access and install materials, and/or perform needed service. Retest and verify repair as required. Perform final road test where applicable.
Air Pump 1 Unit $558.20 / Unit $558.20 EH
Relay 1 Unit $25.68 / Unit $25.68 EH
Secondary Air Pump
Remove and Replace components as required to access and install materials, and/or perform needed service. Retest and verify repair as required. Perform final road test where applicable.
Air Pump 1 Unit $558.20 / Unit $558.20 EH
Relay 1 Unit $25.68 / Unit $25.68 EH
Super Member
Joined: Feb 2023
Posts: 728
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2011 GLK 350 4Matic
Here's the mechanic's stethoscope I have (I have two for some reason). Not pro quality, but a lot better than using a rod or broom handle. ;-)
https://www.harborfreight.com/mechan...ope-63691.html
https://www.harborfreight.com/mechan...ope-63691.html
