Reply To: GT250 EFI DSpec Stalls at Idle after Warm Up
The voltage test checked out according to the instructions in the manual, so I came to thinking that sensor and wiring are good. My friend, who is a Honda technician, was hanging around around that time. I swapped the two IAP sensors around and problem stayed on cylinder 2! This guided us to think that something else is making the IAP sensor trip.
We had eliminated the possibility of vacuum leaks and fueling issues so fiddled around with the throttle body adjustment a little bit to adjust AFRs and the stalling/sputtering at hot idle disappeared. Idle came down to 1500 rpm. The issue has now moved to sputtering at take off, which disappears once the bike gets moving and goes above 5k rpm. Next move is to sync the throttle bodies (TBS) properly by using a throttle body synchronizer (manometer) to adjust throttle bodies at (1) idle and (2) 4000rpm. I will update you on how that works out.
If your throttle bodies are not in sync, engine may backfire, sputter, stall and misfire at different rpms, and this gets significantly worse as the engine warms up. That is one thing that you can check on your Hyosung if everything else checks out as should be.
Regards,
Sam