Cold start idle/misfire trouble

[Lane.steve619]

Have a cold start idle/misfire issue that I can’t figure out, codes as follows p1342, p0300, p1348, p0303, p0302, p1353, p1351, p0300 and p0444.
The car is a 2001 525i
Random new parts include, alternator, coils and plugs, thermostat, battery.
No issues besides a slight rough idle when warm, any help here?

[shogun]

moved from 5 general to E39 forum

[Jaaap]

P0300 BMW - Combustion Misfires Several Cylinders
P0302 BMW - Misfire Cylinder 2
P0303 BMW - Misfire Cylinder 3
P0444 BMW - Evaporative Emission Control System Purge Control Valve Circuit Open
P1342 BMW - Misfire During Start Cylinder 1
P1348 BMW - Misfire During Start Cylinder 4
P1353 BMW - Misfire Cylinder 6 With Fuel Cut-Off

- - - Updated - - -

Step 1 : check the wiring/connector of the evap purge valve.

[StephenVA]

See intake "vacuum leaks" for repair process. Everything from the air box to the manifold. Air hoses, throttle body gaskets, Oil separator hoses etc. Never been done? You can count on the fact they are soft mussy and leaking oil and creating vacuum leaks. That is why you have multiple cyls with lean misfires.
Vid: https://www.youtube.com/watch?v=BSKuZFgAdWU

Option Two
All your injectors are leaking big time.

[Lane.steve619]

See intake "vacuum leaks" for repair process. Everything from the air box to the manifold. Air hoses, throttle body gaskets, Oil separator hoses etc. Never been done? You can count on the fact they are soft mussy and leaking oil and creating vacuum leaks. That is why you have multiple cyls with lean misfires.
Vid: https://www.youtube.com/watch?v=BSKuZFgAdWU

Option Two
All your injectors are leaking big time.


I know I have a leak from my pcv for sure, the dipstick return line is broken off, found that when replacing the alternator, haven’t replaced it yet since it’s just sitting in the garage. I have not found any other vacuum leaks as of now

[Lane.steve619]

I pulled all my injectors, haven’t tested them yet but there’s a ton of buildup on the base of the injectors and in the actual hole where the injectors go, normal or not?

[JimLev]

I pulled all my injectors, haven’t tested them yet but there’s a ton of buildup on the base of the injectors and in the actual hole where the injectors go, normal or not?

Well it’s normal if crappy fuel is uses along with the engine running at low RPM for long periods of time.
Rev that puppy up to 5+K RPM, it’s good for the engine.

[Lane.steve619]

Update, had a couple cracks on my intake boot, iac was stuck so cleaned that up and it’s moving freely now, waiting on replacement oil return line for the pcv 👍🏼