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Old 02-16-2014, 4:23pm   #1
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Default Throttle Body Issue (Pics)

Over the last 6 months I had the engine light come on and got the Throttle body sensor 1 performance code - P0121.

It reset it, then came back on a month later. I have a new DD so I had not been driving my C6 much Nov. Then it started doing a hard start. acted like it didn't want to start or slight hesitation. I waited for a warm up to work on it. In the mean time I talk to a trusted friend and GM mechanic. He told me in the last few months he has seen and cleaned a lot of throttle bodies on all different GM vehicles.

He stated because of the fuel that's currently being used and the cold weather that was causing carbon build up on the back side of the butterfly valve. I don't know if that was his opinion or base on some research.

Today it was warm, so I removed it to clean it. Holy cow! Serious black slightly oily residue all over the back side of the butterfly valve. Mine had a lot more build up on it than the one in the Youtube video had on that one. See pics below

So with care not to move the butterfly valve I sprayed TB cleaner on it and a lot of it washed away with the cleaner. Youtube video I watched before hand said not to move the butterfly valve on new cars that have electrical input and no throttle linkage to gas petal. A few spots I had to rub and spray a couple times to get it off. Got it clean and installed.

On start up, the hard start before was gone. Ran fine no hesitation. After a few engine cycles the engine light went out! My SQUIRREL is fixed!!

note: I had to order the gasket and it will be here Tue. So if it is warm again this next weekend I will take it off again and replace the gasket.

Front Side Of TB

Rear Side of TB

TB rear view

Front View
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