Alright so I bought an EK civic with a d16y4 (same as d16y7 but with a y8 intake manifold) a few weeks ago and It has a misfire at idle/below 3000rpm (I’d assume, no tacho haha). It is not isolated to a singlular cylinder and is intermittent, it wasn’t bad for a while and then one day I had it idling for about 15 minutes with only a few misfires and I turned it off thinking it might have gone away but low and behold I went to start it and it cranked but didn’t start. After about 3 tries with my foot to the floor it kicked over but it sounded very unhappy (bad misfire) and since then it hasn’t been the same.



Things I’ve done:

- Drain and fill up tank

- Replace fuel filter

- Compression test (good)

- Air filter

- Pulled dizzy and cleaned everything (couldn’t see arking spots anywhere)

- Blocked PCV valve

- Cleaned IACV and throttle body

- Oil and filter change

- Replaced headers (originals were cracked, makes me think it may be my O2 sensor??)
- cleaned the o2 sensor



Things I need to check and/or change that could be my issue:

- TPS, MAP voltage

- New dizzy

- Fuel pressure regulator, fuel pump?

- Injectors

- O2 sensor
- Icm

Seems to be running rich but I am going to check the timing soon, any help is appreciated!

Edit: Probably should mention that it had been sitting for 5 years.

Edit 2: Fixed it, timing was out!
Heres me fixing it:
https://youtu.be/SzBJrUpAXxA