What you describe at very low rpms (~2k rpm in my case) rolling on the throttle (not abruptly however) in very small increments and getting a bit of "bucking bronco" effect is what I'm calling the surging. It's only this way on my bike. I have none of this effect rolling off the throttle or at other rpm ranges, only maintaining a low speed (at a certain rpm ~2K) or very slight increase into the "surge" rpm. Chain tension can make it worse as you said. Once lower or higher than the "surge" rpm mine's fine, it only occurs in the one spot. It's really not that bad, just annoying when caught in very slow moving traffic, usually I just upshift a gear to drop the rpms. As RSRBOB has said though there are many factors, many sensors and settings. Some have recently found that adjusting the TPS has made it better or moved it to a more desireable rpm area. If you want to play with the TPS to see what happens, just measure it before you change it so you can always go back to the original setting. Try it a bit higher and a bit lower and note the differences, then adjust it for the best overall effect. That seems to be what a few have done, but most of them seem to describe a much worse "bucking bronco" effect on their bikes before adjusting the TPS than I have on mine. I'll probably leave mine alone since it's not really that bad, but measure the TPS just for a base line and to have a record of it.
Bob B. '93 GTS #340 -----Original Message----- From: Derek Baylor [ mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> ] Sent: Monday, October 08, 2001 11:55 AM To: [EMAIL PROTECTED] Subject: Re: TPS and FI relationship As an owner of one of the more refined '94s, I'd like to know a little more about this whole surging thing. Is the surging you describe present at steady thottle, or during throttle transitions? My bike exhibits what I would desribe as "abrupt" throttle response, especially when rolling on or off the gas at low rmps. Sometimes this "on-off" throttle response will lead to a kind of bucking bronco effect as I try to give it gas smoothly at low speed, but it's also present and disruptive while cornering at higher speed and rpm. I'm very careful about chain tension, I know that a loose chain can exacerbate the problem. I've learned to live with this quirk, but would love to see it gone if possible. Would messing with my TPS or injector sync. help this condition, or just leave me open to making it worse? -Derek [EMAIL PROTECTED]
