I'm at my whits end.
I finished building a hybrid engine. Ran great for the first 200 miles.
The problem occured driving home when the driverside wheel unbolted itself and shredded up the front wire harness(no lines were severed but about 15 fused together). Never trust a friend to torque your luggs!
All mechanicals were repaired; fender, wheel well, rim.
After that the engine wouldn't start. Problem ECU was fried. got a new one.
So now the engine idles very roughly and only when the MAF is left unplugged. as soon as its plugged in the engine dies. The MAFand MAP sensors have all been eliminated from being the problem. Used a similar wrx as a test. All wiring has been repaired. Checked and rechecked. I have replaced both cam and crank sensors with used replacements. No effect. Compression test came back with all 4 within spec of each other.
Other noticable changes
When running on lambda (unplugged MAF) at a rough idle the tailpipe is very rich. lots of smoke.
Am i correct in assuming if it were a burned out injector or coilpack it would run on the MAF but with a cylinder miss. If it was the fuel pump, pump controller it would not run at all. Is this a global problem all cylinders.
Here's a list of engine mods.
2004 USDM 2.5L Block (stock 2004 internals)
2002 USDM 2.0L Heads
2008 oil pump
low temp thermostat
Please help im loosing my mind.