I've been messing with it for about an hour now and can't figure out why I can't get my 73 240z to start.
I drove last night and it ran great.
When I crank it I can hear it almost turn over, but I've tried plenty of times and it's not starting. I am getting fuel to the carb (single holley 390). The fuel pressure gauge before the carb shows 4 PSI, which is what it's always been running at. When I give it some gas, I can see and hear it spray fuel normally. I've tried starting fluid and I'm getting the same results. I thought it would be a spark issue, so I took a multimeter to the coil and it's getting power with the key in the "on" position. I then took out a plug and set it on the valve cover and cranked the car and I am seeing a spark. What could be the issue here? The only other thing I can think of is that something might have gotten wet. I left the car out in the rain all morning and it was a little wet under the hood, but not unreasonably so.
The coil is a 3 ohm flamethrower coil and it's got the Pertronix ignitor electronics rather than a points distributor.
Edit: My plugs are pretty dirty because the car burns oil. I've done loads of reading about it and it seems that the general consensus on the matter is to ignore it as it isn't worth the money to "fix" the issue and just keep topping it off every now and then. The spark on the plug closest to the driver (number 1 I believe) was orange. Should I test all the others while I'm at it and see if it could be an issue related to a weak spark? I've never had any problems cranking over, if it's a weak spark, shouldn't the car gradually get harder to start, instead of going from an instant start to no start? Also, the coil only reads 10 volts with the key in the "on" position, could it be too weak to produce a good spark during compression and cause it to not start?