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I have a 2012 GL450. Rear suspension will randomly lower.

Customer Question
I have a 2012...

I have a 2012 GL450. Rear suspension will randomly lower. Raises back up if I put in park, kill & restart the engine. There is no pattern to this which leads me to believe it isn't a strut or air spring but possibly the ride height sensor. Can you give me a diagram of the location of the rear sensor? Thanks!

Mechanic's Assistant: Okay, I'll connect you to the mechanic to help find that for your Mercedes. Before I do, is there anything else you want him to know?

We keep having issues with the rear hatch no opening. It will close automatically, but has to be opened manually. And it makes a knocking sound for about 2-3 seconds at each start, then clears up and runs fine.

Submitted: 9 months ago.Category: Mercedes
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Answered in 1 minute by:
9/6/2017
Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago
Gunvir Singh
Category: Mercedes
Satisfied Customers: 2,013
Experience: Master Tech at Kennesaw Auto Tech
Verified

Hello, let review your request. Please stand by.

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Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago

Is it just one side that goes down or both sides rear?

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Customer reply replied 9 months ago
Both sides. Did you not get my other 2 issues as well?
Customer reply replied 9 months ago
No sound.
Customer reply replied 9 months ago
Gotcha! Now what about the valve clatter sound on starts?
Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago

You hear that every time you start or after it sits for a while?

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Customer reply replied 9 months ago
When it sits for a minute. Not every single time.
Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago

Roughly how many miles are on the engine ?

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Customer reply replied 9 months ago
61K
Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago

And roughly how long ogo was the engine oil changed?

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Customer reply replied 9 months ago
Less than 500 miles ago
Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago

Was the noise present before?

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Customer reply replied 9 months ago
May have started after previous service. Can't recall
Customer reply replied 9 months ago
Isles rough like a misfire for maybe 2 seconds then clears up perfectly
Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago

The symptom usually occurs due to lack of lubrication to the lifters, once you start the engine and builds up oil pressure the noise is gone. Worn lifters are the usual culprit but since the vehicle has only 60K miles on it, i will recommend to check if correct viscosity oil was used and oil filter is good.

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Customer reply replied 9 months ago
What viscosity is recommended? Service was done by certified Mercedes mechanic. Can't imagine they used wrong oil or didn't replace filter. I certainly paid enough to be confident in that.....
Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago

You can use 0W40 or 5W40. If the fluid and filter is goog, you can also add an oil stabilizer treatment before starting actual engine repairs.

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Customer reply replied 9 months ago
But would it shake like a misfire if it were just valve train not getting proper lunrication? And if it were the wrong weight oil, wouldn't it continue to do the same at idle and not clear up?
Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago

THis vehicle has hydraulic lifters. They require proper oil pressure to work under specifications.

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Customer reply replied 9 months ago
Let's assume the correct oil was used. Now what? What is the factory engine warranty?
Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago

Unless you have an extended warranty, these vehicles come with 4 year/50,000 miles warranty.

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Customer reply replied 9 months ago
But doesn't the engine & valve train have a longer warranty?
Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago

Other than some emission related components, rest of the vehicle comes under 4 year/50K warranty.

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Customer reply replied 9 months ago
No other possible cause for misfire on start?
Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago

This will be the first place to start. There is a possibility of a leaking fuel injector or dirty oil screen. It cant be an electronic failure as a fault light would have been triggered.

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Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago

Do you have any other questions?

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Mercedes Mechanic: Gunvir Singh,
 replied 9 months ago

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