tps evaluating for ii issues

[dave]

Hi all, here's my latest update. I really wanted to perform all of the TPS voltage and resistance tests today, and inspect for loose connections, but my 2 hr planned car repair ending up being a 5 hr job:

• Temperature in the low 60’s.
• All sensors connected.
• Initial start – normal approx. 1,400 RPM high/cold idle.
• Idle settles into approx. 1,050 RPM after approximately 4 miles and 5 stop lights –approx. 3 miles of freeway.
• Turn bike off with key, allow to sit approximately 20 minutes. Restart and idle speed = 1,050 RPM.
• Ride approximately 3 miles, 5 stop lights, idle speed remains at 1,050 RPM.
• Turn bike off with key, bike sits approx. 15 minutes.
• Restart bike, 1,050 RPM idle.
• 2 stop lights, approx. ½ mile of freeway, stop at freeway exit and idle = 700 RPM, but will slowly work its way back to 1,050 RPM. 3 more stop lights and exact same 700 to 1,050 RPM idle each time.
• Turn bike off with key. Bike off approx. 15 minutes.
• Disconnect EOT sensor. Note: Disconnecting the EOT sensor when this bike was exhibiting the high (1,500 RPM) idle always cured the high idle problem immediately. Bike has not experienced a high RPM idle condition for over a year.
• Restart bike, idle = 1,050 RPM.
• Ride approx. 5 miles, 8 stop lights. Idle speed = 800 RPM after approx. 1 mile, at each stop light, but steady. Idle will not slowly work its way up to 1,050 RPM like it does with all sensors connected.
• Turn bike off with key. Plug EOT sensor back in. Restart bike. Idle = 1,050 RPM.
• Ride bike approx. 3 miles. After approx. .5 mile, at second stop light 700 RPM idle returns. At fourth, fifth, and sixth stop light the bike stalls, but will restart. Head to local college where I can ride in the parking lot.
• Turn bike off with key. Unplug TPS. Restart, idle = 1,050 RPM. Ride approximately 3 miles around parking lot, stop and go. Idle speed = approx. 800 RPM after first mile, but steady – does not creep back up to 1,050 RPM like it does with all sensors connected. Does not stall.
• Turn bike off with key, plug TPS back in. Restart – idle = 1,050 RPM. Idle speed remained at 1,050 RPM for approx. 3 miles, and 4 stops lights. After 3 miles the 700 RPM and creeping up to 1,050 RPM idle returned.
• Returned home with 700 RPM idle condition. Blipped throttle a few times, and each time it would drop to 700 RPM, and creep back up to 1,050 RPM.
• Put bike away for the day.

In summary: Disconnecting either the EOT sensor or the TPS sensor does not eliminate the low idle problem (disconnecting the EOT sensor did cure the high idle condition this bike had a year ago). Disconnecting either of these sensors does cause a difference in the low idle condition, and that being once the low idle condition is reached, it will not slowly creep back up to a normal, 1,050 RPM idle. Also, with either sensor disconnected the engine seemed more stable, and less reluctant to want to stall, than it does with the sensors connected normally.

Hope this gives some insight to the guys working so diligently to try to solve this. I apologize for lack of video, but (go ahead and laugh) I do not own a smart phone (but my wife does).