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S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Engine tapping at start

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Old Jan 2, 2022 | 06:00 PM
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Snorman0128's Avatar
Snorman0128
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1997 Mercedes SL320
Engine tapping at start
I have a 2012 S550 that taps when I start it. After 2-3 minutes of idling it goes away. It started about a month ago and I’m concerned as I now it’s not good to hear engine tapping.
Any ideas??
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Old Jan 3, 2022 | 01:18 AM
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2018 S560, 2004 SL500, 2014 S550 (SOLD), 2012 S550 x2(SOLD), 2007 CL600 (SOLD), 2007 S600(SOLD)
It could be a variety of things. You should post a video.
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Old Jan 26, 2022 | 09:11 PM
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2012 S550
Same thing with mine. It could be the cam adjusters.
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Old Jan 27, 2022 | 08:59 AM
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'71 Pinto
If within affected range depending on engine # could be check valves and/or chain tensioners.
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