Still trying to figure out my issue

[poplars]

Still trying to figure out my cold start/ sometimes warm start trouble,

Ive ruled out:
Coolant temp sensor, idle control valve, spark plug cables, therm temperature switch, o2 sensor, new spark plugs.

Things i want to do and probably need to do,
Fuel pressure regulator(need to test it or replace it, either one), air flow sensor, test air intake temp sensor, throttle switch, cold start valve (test or replace), fuel filter, test fuel pump, distributor cap, rotor, ignition coil, injector o-rings and inspect injectors, pulsation damper?, and valve cover gasket.

Essentially after about 10 minutes of driving i get a good idle, and it seems this time is getting longer rather than staying the same.


Am i on track with my list? Are there specific things i should set priority to?

[jlevie]

Before doing any of what you have done, or before going further, you need a smoke test of the intake/engine.

[poplars]

Forgot to mention a smoke test had been done and a throttle body gasket replaced, the mechanic said there were still small leaks in the throttle body though.


Also i must mention that my engine from the previous owner had a 325i intake manifold swapped on there while leaving the throttle, afm, cold start and other stuff stock, the last mechanic had to make a fuel pressure regulator vacuum outlet in the manifold to make it work. Ive been wanting to swap back to a stock e intake but havent had the money.

Except the air intake boot is 325i aswell.