hey all a friend of mine has a gto twin turbo it backfires at 4k itwill pass 4k if you let the throttle off just before and then just feather it.
when he bought it he was given an actuator for the rear turbo as the front one had a new one fitted so today i changed it and it seems a little better but it is still not right, im not sure if its overboosting or not ive traced the actuator pipe and it goes to a small solenoid does this mean that it could be a sensor fault ive never done that much with tubo cars apart from the 200sx, if the wastegates are not opening would that cause it to backfire