I had some carb over-fueling issues on the last tour, leaving me stranded a few times, and I only managed to get it running just enough to get me home.
I didn't get to the bottom of the problem, so I've come to the conclusion that these cheap Chinese carbs are plain junk. So the TBI is going back on.
The TBI is uglier, with more wiring, but this time I'll make a nicer job of the wiring by keeping most of it inside by the passenger, extending the sensor wires where needed.
The TBI has a bunch of sensors required for the ECU;
TPS Throttle position Sensor - monitors your right foot ;)
ECT Engine Coolant Temperature Sensor - shows 300 ohms @ 180F, and reads (back probed) 0.6vdc
EGR Exhaust Gas Recirculator - Reduces Nitrous Oxides at the tailpipe by crudely lowering combustion temperatures, by leaking exhaust into the induction system.
The ECU commands the EGR to open via the Vacuum Solenoid Valve VSV and then the EGR MOD measures the pressure drop.
EGR MOD
P = pressure side (VSV) and vacuum
Q = EGR main side
IAC Idle Air Controller Sensor - Works with the ISC to controls idle at all times, hot or cold
ISC Idle Speed Control valve
MAP Manifold Air Pressure - used to calculate air flow through the engine, with the aid of the IAT
O2 Sensor - Narrow band oxygen sensor
VSV Vacuum Solenoid Valves - gates vacuum to DP, Evap and EGR
DP Dash Pot - Pushes open the throttle commanded by the ECU via the VSV to open and vacuum then retracts this device.
FPR Fuel Pressure Regulator - Compensates only for altitude, it's air cleaner side pressure. (it can also compensate for a dirty air cleaner in this case it does go to vacuum levels with a packed filter)
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