Bonneville America Forums Forums Technical Forums General Tech EFI Throttle Snatchiness

Should an EFI bike have symptoms of a snatchy/grabby throttle, there is a simple fix. A Throttle Position Sensor (TPS) reset may be required.

A TPS reset is also required if a new tune has been loaded into the ECU.

Using TuneECU (from www.tuneecu.com):

This is done with TuneECU running. The bike is started and idled for a few minutes to do this.

ECU Reset TPS is selected in TuneECU, and then the engine is started. Let the engine idle until the “TPS” status indicator (in the status bar) changes to green (after 10 to 15 minutes). No throttle input must be used during this process!

Some other symptoms that can cause a snatchy throttle is chain slack, and incorrectly adjusted throttle cables.

On my test run today, I can certainly say that the smoothness of the throttle is back, and the transition from off to on is near perfect.

H.

Sounds like we need an EFI section in the tech Vault!

I also think that some of the snatchiness attributed to EFI bikes is due to the AI - switching from closed loop to open loop systems - going from 0% throttle and a very lean mix (to burn unburnt fuel) to a sudden a/f mixture change when the throttle is opened.

This can be overcome by turning off the O2 sensors (your cats should also be removed).