T-bird Tim
Registered User
My car has a noisy valvetrain when accelerating and isnt running as strong as it should. I run only premium unleaded fuel but it sounds like I'm running cheap gas. Check engine light comes on when accelerating but goes away at highway speeds. I know it has a tapping lifter but that shouldnt cause this kind of problem. Does this sound like detonation? I have many upgrades with factory computer chip and settings so I know it needs a tune but I dont want to do that until I replace the lifters. Any advice would be greatly appreciated.