tps evaluating for ii issues

[dave]

IMPORTANT UPDATE! Took the bike out on errands this morning (10 miles of around town, multiple stop lights, turned the engine off and restarted 4 times), and it ran perfectly. Took it out a second time this afternoon and it ran the worse it has even run. The engine wanted to stall ½ the time I stopped, unless I held the throttle slightly open. When it wasn’t stalling, it was taking longer than usual (maybe 15 – 20 seconds) to increase in RPM, but was only reaching 1,000 RPM, not 1,050 RPM. I did the EVAP tube removal test multiple times and removing the tubes made absolutely no difference. I blipped the throttle several times with the tubes installed and removed, and there was no difference – for both cases the idle would drop to 700 RPM, and half of the time it would stall. Now here is the breaking news: When the engine stalled I noticed the sound that sounded like a solenoid valve operating for 2 or three seconds after the engine stopped (IACV?). I have never noticed this before, but that doesn’t mean it never happened before. I had my helmet off, and my head down low to look at the EVAP tubes when I heard it. So I Listened very carefully for this sound and repeated blipping the throttle and letting the idle drop to about 700 RPM each time (it was barely running, if it wasn’t stalling), and I heard the sound of the solenoid valve operating what may have been constantly. When I increased the RPM I could not be sure if the valve remained operating or not because it is very quiet, and difficult to hear (especially if you have bad hearing, like me), but it was definitely operating each time the RPM decreased, and when the engine stalled it continued to operate for 2 or 3 seconds. Hopefully this will provide some good information for you guys out there who are helping with this.