Howdy folks - my 2010 Sprint ST has been running really rough lately. And it only seems to happen when I'm under 2500rpm - which is a pain, because I city commute so i spend a fair bit of my time in that range! I've reloaded the original map and reset the TPS - that seemed to work - then 2 days later, back to rough again. Any ideas out there?
The fact that you reset the TPS & after a couple of days the issue returned. A reading of fault codes pending would be useful. I would be checking the voltage readings from your TPS from idle through to WOT. Could be all kinds of things causing the issue, but you’ve gotta start somewhere. If TPS readings ok, I noticed you mentioned reloading the orig map ( reset the ECM) this would take everything back to factory settings. It would take at least 20 miles of riding for the ECM to adapt to the information it receives. If one of these readings steps outside parameters, it will attempt to compensate. Check basics before getting too involved. Compression / spark (plugs - coils) / fuel delivery
You do not always get a fault code with a TPS, because of the wide range between closed throttle & wide open throttle, likewise with the ECT (engine coolant temp sensor) from cold to hot. Check both of the readings of these throughout their ranges before going down the plugs route. A faulty spark plug could play up under engine load & perform better further up the Rev range. Oh what to do ?!?
Could be. Or a small air leak causing the mixture to be too weak (just another option for you to mull over )
