Hey guys, I'm new here but not new to cars. I've already bounce this one off of my Miata buddies too and they are stumped, so any good input is much appreciated.
Cliff Notes at the bottom.
So I purchased a 93 Special Edition from a friend that she sold to me cheap for various reasons. It had been parked for 18 months and the cause of this is that it wouldn't start.
So, I've cleaned it up, changed the gas and it does run...however it requires a push start. If I go to start the car, the starter cranks with no issue but checking fuel and ignition, they get nothing while cranking. Voltage at the fuel pump and also the spark plug both get a small jump in voltage (or spark) once you stop cranking (guessing when the starter circuit closes).
So with the key in the 'on' position, the engine fires right up, runs as expected for 200k+ miles and has no problem doing a donut and smoking the dry-rotted tires
So knowing that ignition and fuel system both work while ignition in the 'on' position but not the 'start' position, I thought ignition switch. So I did a quick test while it was running. Without pushing in the clutch, clicked the ignition to start and it made the engine stutter, did it again and it died.
I thought this was surely to be the ignition switch. Ripped it out, cleaned it up and checked all the ignition points from the schematic. ALL
are fine...except for the ACC position of 'B1' to 'ACC'.
So now I'm
We also have checked the Circuit Opening Relay (aka fuel pump relay) and the Main Relay.
Car will push start and run without issue. The car will crank but won't start. Ignition and Fuel systems seem to get no voltage while
the starter is cranking.
Oh and moderators, if you think this is better suited in the ECU section, please feel free to move it.