So I started up the car, and was wondering why the fuel/air mixture gauge was reading all the way lean, now I personally think the o2 sensor is bad/wonky, but I figured, I better check it out.

I pulled the cover off the fuel pump assembly, and stabbed the red and black wires with my volt meter, surprisingly to find out, its only running 6.6volts at idle. I'm wondering, I thought it was supposed to have 9v at LOWEST.

Even revving at idle to 4k, it still remained at 6.6v. I pulled the harness wires and everything, checked all of them, no broken wires. The resistor is still plugged in as far as I remember, and I'm wondering if maybe the resistor crapped out?

Kind of afraid to drive the car right now because the car is a TII swap and running lean is no good.

 

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/pics-my-overkill-fuel-pump-rewire-732904/

 

+1. Bypass the stupid relay and all the 20 year old wiring and run your own relay with a 30amp fuse and 12 gauge wire.

I'm pretty sure this is what blew my last engine, I had less than 5V at it though.