Lighter = Faster (N/A build thread #2)

[infernosg]

I got the engine and ECU synchronized and calibrated the fuel level sensor on Saturday. Sunday morning I primed the fuel pump for the first time to make sure there weren't any leaks. Fortunately there were none so everything was looking good for a Sunday afternoon start up. I pushed the car out of the garage, enabled the injectors, primed the fuel pump, hit the starter, and... nothing. Maybe one or two little bumps of ignition but no start.

Time to pull the plugs to look for signs of fuel. I pull the L1 plug and it's bone-dry; not a whiff of gasoline. I pull the L2 plug and immediately there's a strong fuel odor, so the front rotor isn't getting any fuel but the rear is. I've already verified the injectors are good by hooking them up to a 12V power source so I broke out the multimeter and started testing for continuity:

Injector to sub-harness break-out connector: "Beep"
Injector to engine-side bulkhead connector: "Beep"
Injector to ECU: "Silence"

It turns out 3/4 wires in the sub-harness connector were wired incorrectly. After de-pinning and correctly re-pinning that connector there's continuity from the ECU to the injector. Just to be sure I also went back and checked the ignition wires. Fortunately those are all good.

[FC Zach]

Originally Posted by infernosg

It turns out 3/4 wires in the sub-harness connector were wired incorrectly. After de-pinning and correctly re-pinning that connector there's continuity from the ECU to the injector. Just to be sure I also went back and checked the ignition wires. Fortunately those are all good.

Hmmm. . Mine was that exact same way!

[infernosg]

Originally Posted by FC Zach

Hmmm. . Mine was that exact same way!

I assume yours wouldn't start either? I figured it might at least start on one rotor.

Last night I tried to better set the base fuel pressure without the engine running. The Aeromotive FPR doesn't hold pressure long after the pump is turned off so I had my wife watch the gauge and note the peak pressure during priming. It was ~60 psi at first time around so that might explain the excess fuel. I got it to ~45 psi and called it good enough.

I'm certain I flooded the rear rotor. I squirted a 1/4 teaspoon of 2 stroke engine oil into the both rotors and cycled the starter until I just about drained the battery. My intake and garage still reek of fuel though so I don't know how much good that did. Tonight I may put the spark plugs back in, keep the injectors and fuel pump disabled, crank the engine, and see what happens.

At least I got the display set up. I won't know if the speed or odometer works until the car is moving but everything else appears to be functioning properly. The only issue is I can only display fuel level in liters.