Quote:
Originally Posted by Sportsguy83
Replace the Crawford AOS,
Don't need to change the fuel pressure regulator, there's lots of people (thousands) running a turbo kit with stock regulator and no issues.
Since the car has been leak tested AND at WOT the car behaves fine with no leaning out issues, I'm pointing towards the tune BUT, it seems weird two tuners taking a crack at it and not being able to resolve it.
There is a way to test if it's the DI, you can turn the injectors off via the tune and test if the car behavior improves.
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Would DI injector leak cause this sort of semi-random crap though? My tuner said that they use DI until they need PI, so it makes sense to me why light throttle shows the issue way more than WOT. If DI seal leaks really could cause this, then I'm definitely willing to spend the money to fix it. I was just under the impression that when those seals fail, your engine runs way worse/not at all.
Another symptom I experience sometimes: I'll be in first, around 1k RPM or so, lightly hit the throttle, and nothing will happen for about a second, and then the car jerks to life and starts accelerating. That's a fun one. Also this morning my car really didn't want to start. Turned and turned for about 4 seconds before I tried again with the gas pedal to the floor. Then it started up. Leaky DI seal == gas chilling in cylinders on cold start maybe?