by Joe
(Maryland)
For background, I had the ECU unit flashed with the NIZPRO 332hp tune in January. I've put on more than 50 hours since. FUesl economy went from 1.5MPG to 2.3MPG at WOT. Cruise is 4,400-4,600 at 34mph with 2.3MPG.
Normal idle speed is 600rpm.
Last weekend, I started the motor and noticed it was running rough and saw the engine speed at 1,200. The motor would go into gear so I made it home ok, even running at 4,600rpm.
Yesterday, it started rough and was idling at 1,200 but went into gear so I went to a cafe 1 mile away.
Upon leaving, I started the motor and a loud bang, like a gunshot, was heard and the motor started to idle at 1,700rpm and went up to 2,300rpm withing 5 seconds.
What could the issue be? Thanks!!