Leaderboard

Don't know your machine BUT you described the broken off exhaust pipe tip "with the sensor still attached and connected". This have 4 wires and looks like an O2 sensor? If so, your ECM doesn't know the fuel air ratio (amount of O2 in the exhaust) with it reading open air O2 content and mapping to the wrong injection pulse width (amount of fuel). That said.....reattach the tip and seal good enough so that no free air (O2) enters downstream before the O2? sensor. Might want to undo the fuel pressure bump up and check again. Some of the different O2 sensor vendors for the HiSun variants had problems......e.g. 2 hole vs 3 hole and had erratic runability problems with everything else working AOK. Even had some new junkers right out of the bag.