Question about 2011 Mercedes-Benz E-Class

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With the engine warm, there is a light knocking noise coming from the engine area at idle. As rpm's increase the noise appears to go away. This noise is present at idle in drive, park and neutral.

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Have the dealer check it, sounds like a bad bearing or an oil problem. Either way its not good.

Posted on Jan 02, 2011

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Posted on Jan 02, 2017

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1 Answer

Making whistle noise on off on run and stopping.


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* Whistle when you get more gas (increase RPM, put gas pedal, sometimes just idling but louder when you put more gas)
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It could be if the noise comes back at idle . If not then the problem is else where. It may be a faulty hydraulic valve lifter that is draining down and taking longer to fill with oil at idle. If you have automatic cam adjuster it may be in there (V V I or VETEC type of engine.)

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Intermittent noise not a misfire sounds internal like a rod or valve or lifter. No check engine light, car has good power. U only hear noise after car is warm and not all the time. Could it b my belts? Any...


After it's warmed up to operating temp, if it makes the noise at idle but goes away reving the engine, I would guess that a lifter has gone bad. Rod bearings as a rule knock all the time. It's hard to diagnose these things over the internet, because there are so many variables when it comes to noises.

You need to warm the car up and then while it is running, open the hood and try to pinpoint the source. lifter noise will sound like a "tick" and come from somewhere near the top. Rod bearings will sound like a 'knock" and will come from the bottom of the engine.

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Engine knock hard over 2500 rpm


Does the oil light come on or the knock occur during the engine warm up after a cold start?
There could be a couple of problems causing the issue. You could have an oil pressure pump or pump pressure regulator sticking. I would have a mechanical oil pressure gauge installed and verify oil pressure at idle and 2500 rpms to make sure oil pressure is in normal ranges.
You could also have excessive piston rod bearing, crankshaft bearing or cam shaft bearing wear that will cause oil pressure to drop too low to prevent the rod knock your hearing at 2500 rpm.
You said a knock and not a ticking noise,so I don't believe a lifter is the issue at 2500 rpm.
Start with the oil pressure check and go from there.
Let me know.
Regards,

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you need to get your valve adjust by the dealer

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