No Power Captain!, 74 914 2L runs for 10 minutes then dies ????? Options

[thompson-mfr]

Ok, I have been fighting some electrical gremlins.

74 2.0L FI 037 brain (now with 270 ohm ballast resistor)

The car runs great for 10-15 minutes then dies.

I tested the power relay and fuel pump relay and fuel pump itself and have power to all.

After it cools off for 3-5 minutes it will start again.

I have not checked for spark, but am guessing when it dies this is what is stopping.

What could this be??? ECU / Brain / Computer? I know they rarely fail

When I unplug my air intake sensor it has no affect on running. I thought maybe another sign of potentially a bad ecu / brain / computer. I have read it is supposed to richen the mixture.


Here is a pic of my car just because I like threads with pictures.

[DBCooper]

It's almost certainly fuel. You have some blockage, the gas cap vent, the fuel tank outlet, a kinked or deteriorating hose, a clogged fuel filter. The fuel pump will build pressure but the engine consumes more than the reduced supply, so the pump will suck but because of some restriction there's no fuel available to flow. So the engine is starved, dies, and while not running the fuel will seep by, the pressure will equalize so it can start again, but without enough fuel to keep running.

Because it runs for ten minutes the electrical possibility would probably be related to heat, affecting sensors, the coil or condenser. but then it shouldn't run again until cool. From your description it's almost certainly fuel.