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BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17368
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2011 Chevy suburban, rough idle when car in gear at 500 rpm,

Customer Question

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: 1 year ago.
Category: Chevy
Expert:  BOBBYSS replied 1 year ago.

Hello, my name is***** you for the question. Can you tell me how many miles are on the vehicle?

Customer: replied 1 year ago.
Customer: replied 1 year 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
Expert:  BOBBYSS replied 1 year 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.

Customer: replied 1 year ago.
How do I adjust the timing?
Expert:  BOBBYSS replied 1 year 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.