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I'm happy to say that up until this point, I am one of the lucky ones who hasn't had to visit this thread. I recently started getting really rough starts with Code 29F2 and half engine symbol on cold starts. This would usually happen if the car sat for 36+ hours at a time.
I have replaced injectors with index 12 so injectors are not the issue. I had to clear the code when uninstalling my Cobb tune and the dealer won't replace the HPFP without the code even though it has started rough for them the last couple of mornings. Symptoms are there, but no code. The tech stated that there was smoke from the exhaust and brought up the injectors. Would the fuel pump leak overnight causing these rough cold start misfires?
When I turn off the car and clear the code the car runs perfectly.
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