Very difficult hard start today.An update. I’m now at 36k miles and experienced another stall; this is the fifth or sixth stall since I’ve owned the bike. Also, the bike is now at the point where I twist the throttle ever so slightly for a quick start; warm very slight but cold significantly more. Still no check engine light or fault code...
Did a deep dive into shop manual, which I used to see if I could find any diagnostic codes, and found reference to poor engine performance and no codes, see picture. Since the bike is requiring some throttle to start I now feel I’m at the point where the problem is consistent enough to troubleshoot.
My plan of action, once I complete a medical procedure next week.
Take bike to dealer and use Yamaha diagnostic tool to determine if any fault codes exist. If so, address.
Next, use diagnostic tool to check throttle position sensors and adjust to midrange value if not already.
Do same for acceleration position sensors.
The manual specifically identifies these sensors along with coils and fuel injectors. Since the bike runs fine the rest of the time and spark plugs look great I really doubt a problem exists with a coil or injector.
Comments? Anyone have experience with these two types of sensors, four in total?
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what year is your Tenere, if it’s a 12 or 13 have you had the wiring recall done ?Clarification on my stalls. The stalls are random; extremely random and lately have been occurring after sitting at a light for a minute or two. When I twist throttle to accelerate, engine stalls.
Regarding hard starts, bike turns over fine and always starts but requires a twist of the throttle. A little when warm and more when cold. All this leads me to question the throttle and accelerator sensors. More to come once I can get the bike to the dealer and tied into their diagnosis tool.
Okay thanks please let me know what your dealership has to sayClarification on my stalls. The stalls are random; extremely random and lately have been occurring after sitting at a light for a minute or two. When I twist throttle to accelerate, engine stalls.
Regarding hard starts, bike turns over fine and always starts but requires a twist of the throttle. A little when warm and more when cold. All this leads me to question the throttle and accelerator sensors. More to come once I can get the bike to the dealer and tied into their diagnosis tool.
Good question. I know (think?) that Anthony's flash defeats the deceleration fuel cut. This is a function that stops the injectors during deceleration to avoid excess HC emissions, since with the throttle closed there may be too little air and the mixture would otherwise go rich. The ECM switches to an idle map when engine RPM drops to idle speeds. My stalling events usually happen after deceleration when pulling in the clutch at mostly very low speeds or just before stopping. I've wondered if the ECU sometimes lags switching from the fuel cut map to the idle map, just long enough to let the engine stall? I've never had the engine stall once idling however.Wonder if a reflash by Anthony would cure this?