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Does anybody think the carbon buildup and valve problem are related? I know evidence points to a valve metallurgy issue. But I wonder if bad (regional) fuel and/or bad fuel injectors are related. ...

I have an '08 with the valve failure. The shop could hear the air escaping during the comp test. The car has 104k on it. The shop has quoted $3500 but warned there might also be piston ring damage...

I have an 08 9-3 with 104k miles and all the classic signs of intake valve failure. I have taken it to a Saab specialist who has not heard of this failure before. I do have bad compression, but, he...