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c450 knocking noise upon start up please help

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c450 knocking noise upon start up please help

 
Old 05-23-2019, 01:05 AM
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2016 Mercedes C450 AMG
c450 knocking noise upon start up please help

hey guys,

im getting this wierd knocking noise from my engine for a couple seconds upon start up if engine has been sitting for atleast 30 minutes. cars been to mercedes 2 times for this issue each time was $6000 of warranty work they said. they did all my cam shatter adjusters and a few other things. they now are trying to tell me that the noise is normal. please watch this link and let me know if this is normal


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Old 05-23-2019, 08:16 AM
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I definitely wouldn't call that normal.
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Old 05-23-2019, 10:13 AM
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Not normal for that motor. sounds like top end starved of oil for first few seconds. Oil level good?
Not sure what they could have done for $6000? Replaced the motor? You have a sheet of what they did?
I would try a different dealer.
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Old 05-23-2019, 10:24 AM
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Old 05-23-2019, 10:26 AM
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all that paper work is from 2 different visits to the dealer. tech stated i basically have a whole new top end.
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Old 05-23-2019, 11:06 AM
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I'd take it to another dealer still. From paperwork they did a lot of inspecting and replaced the cam adjusters ($1,400ish in parts) plus labor @145/hr i could see maybe $3500 in the two visits unless im missing something that they replaced.
But them saying the noise is normal if they are hearing whats in the video is not ok. Have them start up a C43/GLC43 with you and note that noise doesnt exist.
Its still under warranty lucky, but this is not something ive heard of before on this motor. Sorry cant be of more help. Report back when they finally find the cause and fix it.
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Old 05-23-2019, 11:19 AM
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Wow

Wow. This is crazy. Looks like itís time to trade in the car.
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Old 05-23-2019, 11:38 AM
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i also have 2016 C450 and i dont noticed what' wrong with the sounds.
can someone post a video of normal noises so i can compare ?
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Old 05-23-2019, 12:43 PM
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Originally Posted by netboy View Post
i also have 2016 C450 and i dont noticed what' wrong with the sounds.
can someone post a video of normal noises so i can compare ?
From the 4s mark to 7s mark in the above video the motor sounds like a diesel motor idling. I have the same motor and have never hear that loud of knocking noise at cold startup. yes the injectors tick and the fuel pumps are noisy but not oil starvation sound.
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Old 05-23-2019, 12:52 PM
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first time i brought the car in for this noise they told me they found a whole lot of gas in my oil and i was driving like that for a few thousand miles. they did all this work and noise only is getting worse. only have had the car for 6 months
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Old 05-23-2019, 12:54 PM
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when you first got the car back after fresh oil change did it make the noise?
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Old 05-23-2019, 12:56 PM
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yes made the noise not as bad tho. and oil use to do it when the car was warm but shut off for about a half hour then turned back on. now it does it every time the car has been sitting for atleast 30 min or cold start
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Old 05-23-2019, 01:00 PM
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iím hoping for them to put a motor in it this next time. iím gonna tell them i donít want the car back until this noise is gone. who knows all this money they put into it already they might by the car out and have me buy a new c43...very aggravating since my car sits at mercedes for atleast 2 weeks everytime
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Old 05-23-2019, 01:02 PM
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c
weird that all that work did not resolve this issue. I would assume something faulty with head gasket and valve train (due to the fault codes and parts replaced). But if that were the issue this problem should be resolved.

I would also assume that the new parts installed may take some time to break in and the noise to diminish over 500 or so miles but if it's getting worse as you drive I'd be concerned some of the repair work was not performed correctly.
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Old 05-23-2019, 01:04 PM
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iíve driven the car about 3k miles since the work was done
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Old 05-23-2019, 01:14 PM
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lol that's not normal. try a different dealership. If no dealership can fix it trade it in before warranty is up.
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Old 05-25-2019, 05:15 PM
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My 2 cents. Get someone from MB Corporate involved. You should not be adversely affected financially by this issue if you need to trade it in. I would push the dealership principal and Mercedes corporate to fix the car or take it back. You’ve been patient enough if they actually swapped out all of the parts they said they did, the are either guessing or they likely know they can’t fix the car.
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Old 05-31-2019, 09:03 AM
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good morning guys, dropped the car off to mercedes on tuesday. mercedes said they couldnít duplicate the sound. i went there and i duplicated it for them and showed them the noise. i has my service advisor technician and the shop foreman out there when i duplicated the sound. they are now going to go in to further diagnostics. they said they will be opening a ptss claim with mercedes corporate. so now iím waiting to hear from them on what they plan on doing. very aggravating hopefully itís a speedy process but i. d.o.n.t think it will be. i made it clear to them that i will not drive that car off the lot until itís fixed. they said theyíve never heard that noise for this engine. any have a clue what you think theyíll end up doing with it?
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Old Today, 08:50 AM
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C400 2015
2015 C400 W205 few second Engine knock/Rattle during cold start, started happening a

Guys I have the same issue


WHY are you bringing your cars to different dealerships?

My car just ran out of warranty Mercedes won't help me even after 2000 km over luckily I work at a dealership my mechanic told me that it's the right camshaft sprocket. I ordered all 4

cost my 4k parts only

Scheduled to be repaired this Saturday hope it solves a problem glad to see someone is having the similar issue let's solve it together.




Last edited by Blackhead Kings; Today at 08:54 AM.
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