First...history of problem (sorry for the length)
1. My 2008 WRX had the fuel pump replaced with 37,000 miles on it...hard start issue. This didn't fix the issue.
2. Fuel Pressure Regulator replaced. This also didn't fix the issue.
3. Replaced ALL injectors. My car was not holding pressure after shutting off for a period of time...basically bleeding down. This DID fix the issue.
Second...new problem: The dealer tech is telling me the pressure is holding, but states that the pressure is 'weird' at first crank...shooting up to 40 something PSI then falling back down to normal pressure. He stated something along the lines of the injectors are getting a signal to stay open or open prematurely after the engine is turned off. I don't quite understand this or how it could happen. He stressed that my new injectors will go bad again and the problem will return.
Third...My car was tuned on a Mustang AWD dynamometer and on the road by a reputable tuner a few years ago...never had any problems until now. The dealer is blaming the ECU program and is telling me I need to put it back to stock or it will happen again. Any logic to this? Does anyone have any insight on this? Did I get a bad tune or is something else going on?
I'll be happy to answer any questions you may have in order to get this figured out.