I've tested the starter (8 times in a row at Advance), the alternator (took battery cable off with car running), battery (tested at Advance), and the clutch switch (paper clip jump). Also tried adding more grounds (used jumper cables).

Car push starts just fine and runs perfectly. Didn't start having this problem until I changed the oil and put in a new o2 sensor.

 

check your grounds....EVERYWHERE. mine did the same thing and was just a ground wire that broke off.

 

Valve cover wire, tranny to body, battery to body. That's it right? All 3 are in good shape, and like I said in the op, I added extra grounds and that did nothing. Edit: And the thermostat housing ground. I can feel the clicking in the starter if I put my hand on it.

 

yeah check grounds, put a new battery in it see what happens..
Would replace battery terminals if anything.

 

Sounds like a dead battery.

 

X2

For the sake of verifying, how old is the battery? It should have a year/month on it.

 

New to the honda game, But had a issue like this on a different car & it was the relay for the starter.

 

10/12 is the battery date. I put new brass terminals on a month ago.

 

You removed the battery from the system to verify the alternator was working while the car was running?

R.I.P ECU.

Maybe next time have them TEST IT at the advance auto you went to to test the starter.

 

There is also the ground on the thermostat housing. G101

 

Mine do the same once, put a new battery and sometimes still do the same.

With the new battery and a new ground from the starter bolt to body, fixed.

 

Never once had a problem testing the alternator that way. If it refuses to start one day, I can come back a couple days later and it'll start. Another reason I don't think it's the battery.

 

Hilariously, it ended up being a junk battery... It wasn't holding a charge. Free replacement from advance and everything is good again.