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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53943
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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I have a GL450 2007, it has a rough idle meaning a vibration

Customer Question

i have a GL450 2007, it has a rough idle meaning a vibration when on the stop light and when it's moving it's not picking as before. check engine light on
JA: How many miles are on the car? Have you checked the spark plugs?
Customer: 75,000 miles
JA: What is the model of your '07 Mercedes?
Customer: didn't check
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: i tried to change the air mass flow sensor
JA: Anything else you think the mechanic should know?
Customer: no
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Mercedes Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Mercedes
Expert:  Marty replied 1 year ago.

Hi, my name is***** you had your vehicle scanned for the fault codes stored in the engine control module?

Customer: replied 1 year ago.
It was scanned by the mechaninc and he claims that i need to change the intake manifold
Expert:  Marty replied 1 year ago.

The intake manifold problem that these motors experience will not usually cause a poor idle or vibration. I don't doubt that you need a manifold but I suspect there may be an ignition misfire that occurs. Usually a misfire is caused by a bad ignition coil. Do you have the list of codes?

Customer: replied 1 year ago.
no i can get it later
Customer: replied 1 year ago.
how many ignition coil i need to change?
Expert:  Marty replied 1 year ago.

I would like to see the codes. There are a total of 8 coils.

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