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2011 Chevy suburban, rough idle when car in gear at 500 rpm,

Customer Question
changed plugs, wires, new air...
2011 Chevy suburban, rough idle when car in gear at 500 rpm, changed plugs, wires, new air filter cleaned throttle body and maf, used Sean foam, techron, nothing helped, any ideas?
Submitted: 2 years ago.Category: Chevy
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Answered in 1 hour by:
3/1/2016
Chevy Mechanic: BOBBYSS, Master Technician replied 2 years ago
BOBBYSS
BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17,611
Experience: ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH
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Hello, my name is***** you for the question. Can you tell me how many miles are on the vehicle?

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Customer reply replied 2 years ago
108,000
Customer reply replied 2 years ago
I'm thinking what can cause this without giving me any codes? can a clogged injector do this, ? On the other hand once I start moving it drives fine
Chevy Mechanic: BOBBYSS, Master Technician replied 2 years ago

Most commonly on this engine it is either a clogged injector or an issue with the variable valve timing. Most of the time it is the timing as it tends to only cause this at idle.

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Customer reply replied 2 years ago
How do I adjust the timing?
Chevy Mechanic: BOBBYSS, Master Technician replied 2 years ago

The valve timing is not adjustable. This is controlled by the computer. This only occurs if the valve timing solenoids are not functioning or if the oil pressure is low.

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