So I've now fitted a new OEM Air Flow Meter and reset the ECU. The idle improved again, but once more when it warms up, it feels like a light misfire.
Since then, I have also:
- replaced all the plugs with BKR6E, gapped to 0.7mm
- checked and then bypassed the PCV valve
- checked compression on all cylinders. #1, #2 and #4 were 180psi, #3 was 170psi
- since I can't bench test the injectors, I've swapped #1 with #3, but the issue is still on cylinder #3, so it's not the injector itself
- I've checked that all injectors have 12v, and traced the wires back to ECU. All the signal wires have less than 1 ohm resistance
- swapped leads over, just to be sure
Running lean on cylinder #3 makes me think that I have to try another ECU, as I'm either forgetting something, or there's just nothing else which could cause this issue, except the injector control.
Incidentally, the car is also running 0.5 bar of boost, and I believe it should be at 1 bar? It's got a TD04.
Reading one of the other current posts, I've followed the diagnostic procedures but can't find the issue either. I'm not so worried about the lack of boost at this stage, because if it's running lean I really don't want to blow it up. One at a time, I've done the following:
- I've checked that the restrictor pill is there, and even cleaned it up.
- I've checked that the Wastegate Solenoid is operating, and cleaned it out. Now it's ticking much louder, and blowing through it while it's ticking I can definitely tell it's opening and closing.
- I've blocked off the Wastegate Solenoid, but boost holding steady at 0.5 bar.
- Manually opened the Wastegate and let is slap shut.
- Blocked off the intake after the AFM pipe, and pressurised the system, but couldn't see/hear any leaks.
- Blocked off the factory BOV. This made it feel like the car is spooling up faster and that noise..... lovely.
I don't know if both the issues are related or not.
I'm all out of ideas.