- Tue Jan 03, 2017 2:15 pm
#65159
It could be a number of things. Is the throttle sticking? There should be a distinct click as the throttle is closed. Are all the sensors clean and properly connected? A likely candidate would be the tps (throttle position sensor). It could also be that the tps voltage is set outside of the correct range. I assume there are no faulkts stored or showing? To check for stored faults ground the spare earth cable attached to the ECU,switch on the ignition but do not start the engine. Look at the MIL (malfunction indicator light). If a fault is stored it will flash a series of short and long flashes. The sequence will indicate the potentialproblem. Be aware that a current, as opposed to stored, fault will show up by the MIL being lit permanently when the ignition is on. It could also be the MAP sensor connection. To a degree the EFI on these bikes can be a bit jerky off idle anyway. Also, I don't think that the EFI shuts off the fuel flow when the throttle is closed. It could also be a leak in the air intake. be aware that a leak causes a rich mxture, not lean as would be the case with a carb. Power Commander? Shouldn't be necessary unless the exhaust or air intake has been modified. Personally I got sick of diagnosing sporadic faults with the EFI on my 2015 C5, including the one you had. I cured it by putting a carb on it - cheaper than a Power Commander and more easily tweaked to suit changes in intake and/or exhaust. bye bye problems. Thoroughly recommended. Others who have more patience will take a different view, but to me the EFI looks odd without the carb there and I like having a proper choke that doesn't require a double jointed thumb to hold open and a nice disgustingly anti-green, fire risk tickler. Just me.
