after installing cos cams in my 9 , at idle i have a very high a/f ratio , car also runs rough, i have a aem wideband , did all the normal trouble shoot before posting , boost leak test , fuel system test , than i unpluged the oxygen senser on the 10.5 hot side and nothing happened it still ran lean , and rough ,can the oxygen senser be the problem??

 

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any help would be greatly appreated, does the oxygen senser scrwed into the 10.5 hot side of the turbo alter A/F ratio ??, i unpluged mine and theres no change to a rough running lean idling moter, thanks

 

well naturally the cosi cams are gona have a rougher idle then lets say the GSC S1's. However, i don't think they they should be too rough.

You need a tune anyways. Get a reflash or custom tune and that should help out a lot.

How lean are we talking?