If the issue started when you changed he plugs try another set, they’ve traveled a long way before they ended up in your engine, could’ve been damaged or manufacture defect. Happened to me once on an outboard and drove me crazy.
Does anyone know how the fuel injection works on a 600 etec?
This is how a car works
The injectors stay open (base pulse) based upon a table in the prom
Spark is the same
Map (manifold pressure) , temperature, throttle etc. Tell the computer where to " look" in the table.
The computer then monitors the sensors to provide a feed back loop to adjust the injector pulse.
I would like to start from the fresh "stock" tables
It saves a half day of riding before the computer learns the optimal fuel and spark settings.
ETECs are very basic systems. They have secondary inputs that help like Air Temp, Coolant Temp and Air Pressure. You can imagine the variations between sleds.
Whatever makes sense with a car you can pretty much throw out the window with a 2 stroke. If you like nitty gritty details read every post daag makes on 2 stoke tuning and performance.
The following may help give an idea how the ECM controls the Fuel and Ignition.
Ignition Timing
2013 Shop Manual - Adobe Reader page 289
The Crankshaft Position Sensor (CPS), the Air Pressure Sensor (APS), and the Throttle Position Sensor (TPS) are the primary sensors used to control the Ignition Timing.
The ECM is programmed with data (ignition mappings). Using engine operating parameters provided by the sensors, the ECM controls the ignition timing for optimum engine operation under all operating conditions.
Throttle Position
2013 Shop Manual - Adobe Reader page 237
TPS will determine the basic parameters for all fuel mapping and several ECM calculations for idle speed control of the engine.
e-RAVE
2013 Shop Manual - Adobe Reader page 110
Many different mappings are used by the ECM to control the 3D RAVE valves. The mappings are based on current engine RPM, crankshaft rate of acceleration or deceleration and the following inputs: intake temperature, TPS, knock sensor, engine coolant temperature and APS.
Fuel Injection
2013 Shop Manual - Adobe Reader page 234-235
The ECM reads the input signals from different sensors which indicate engine operating conditions at micro-second intervals.
The ECM calculates the proper air/fuel ratio and activates the output to fuel injectors.
Signals from sensors are used by the ECM to determine the injection parameters (fuel maps required for optimum air-fuel ratio).
The crankshaft position sensor (CPS), the Throttle Position Sensor (TPS) are the primary sensors used to control the injectors. Other sensors (like temperature sensors, etc) are used as secondary input.
2013 Shop Manual - Adobe Reader page 253
The correct matching of the fuel injector and cylinder must be confirmed using B.U.D.S. And incorrect match between the fuel injector and cylinder may lead to engine misfiring, improper idling or poor fuel economy.
NOTE: The engine will be able to run with an improperly matched fuel injector. However, the engine may misfire, run rough at idle, have poor fuel economy or run lean.
2013 Shop Manual - Adobe Reader page 237
The fuel injectors provide a stratified fuel charge to the combustion chamber up to clutch engagement speed. Beyond this RPM, the fuel charge becomes homogeneous.
The stratified fuel charge provides a cleaning combustion , better idling and less smoke.
Idle Speed
2013 Shop Manual - Adobe Reader page 235
The air flow is controlled by two throttle plates. Each throttle plate has a 6,8 mm (0.268 in) idle port in it.
Since there is a constant airflow through the idle ports of the throttle plates, the idle speed is controlled by the ECM by varying the amount of fuel injected in the combustion chamber and by controlling the injection timing.
Ahhh, the magic of a 600 with the shorter and lighter track. In 6 inches of granular snow I was able to catch-up to the 800 long tracks with a 600 short track. The problem was the launch was wasted with a worn threads and no studs, but that track was so easy to spin that it robbed little power compared to say a brand new track. I was just messing around with the 800s trying to get a better grip on the track before it was replaced. 195 km on speedo was something we had rarely if ever seen on our sleds let alone being 2up on a stock setup 600. That once in a lifetime fluke was helpful to challenge my own biases.
Any updates? That's the tank you that I am looking for
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