Reply To: GD250N – Hanging Revs and Stalling when Throttle opened quickly
Great Success!
(Grinning ear to ear right now)
Finally replaced the IAC, had to rewire the plug for it (didn’t get an OEM part). Didn’t run right from the get go, in fact, it behaved even worse. Then I did some testing with locking the IAC position at certain positions, found a stable value (idle around 1800-2000) and set the base value in the ECU to that value and disabled PID/Closed loop adjustment for the IAC, with slight adjustments to the throttle follower.
Runs without flaw now. Returns right to idle when revving up, never sputtered, hot or cold, I can (even if it sounds horrible and isn’t good for the engine at all) lug the engine like crazy (30kph in 5th) without it cutting out at all. No sputtering/misfiring on acceleration from a stop like before. Full throttle doesn’t feel weak anymore like my experiments with the IAC locked in one position. Decel enlean is working, where it wasn’t before. I’ll monitor the spark plug to see if it’s running properly in terms of mixture, but it has been running great in all my testing today.
Oh, this isn’t necessarily relevant anymore, but while waiting for the part, I did get hold of some feeler gauges and checked my valve clearances, all in spec! (Intake L,R: 0.15mm ,0.13mm Exhaust L,R: 0.25mm, 0.23mm)
A fun exercise XD and gives peace of mind on a machine that seems like it wasn’t cared for that well.
Thanks for the support!
I’ll be back if I do encounter any issues
I’ll also post some pictures if I get around to fixing & customizing the bike visually (tank cover is cracked, others scratched)