[zygi898]

I replaced the VVT sensorand nothing changed..

did you smoke test the intake?

Yes couple times.. nothing is visible.

scope the crankshaft sensor to see if perhaps any specific cylinder at fault

if not scope timing (cams, crank, vvt PWM) with and w/o vvt solenoids to see if all is OK

I dont have oscyloscope to measure timing that way.
I am out of idead even what to check next.. ?

[willisodhiambo]

Can you check the lambda readings and share? I think your problem is in the valvetronic system or lambda system,

1. Check if valvetronic angles are being red ok - sensor
2. Lambda readings  off - Valvetronic mechanical wear or faulty oxygen sensors

Start be disconnecting VVT sensor, see what happens. Then reconnect VVT and disconnect O2 sensors. See what happens

When i disconnect VVT sensor or any vanos solenoid idle are smooth , i have order new sensor and will report after installing.

Did you test the O2 sensors as well by diconnecting them? I have had a similar problem with an N52 E83 and I resolved it. Something is making the dme hunt for smooth idle. It is either the lambda system or the valvetronic system. Start with the simple test. Disconnect O2 sensors and we see if it settles

[bmchicago]

o2 sensors could be swapped or installed incorrectly, or vanos solenoids connectors are swapped

[zygi898]

o2 sensors could be swapped or installed incorrectly, or vanos solenoids connectors are swapped

O2 and vanos solenoids are connected like TIS says, even i chave change them but alto without any result.

Did you test the O2 sensors as well by diconnecting them? I have had a similar problem with an N52 E83 and I resolved it. Something is making the dme hunt for smooth idle. It is either the lambda system or the valvetronic system. Start with the simple test. Disconnect O2 sensors and we see if it settles

Disconnecting o2 sensors or MAF dont help either.

I am thinking if it isint valvetronic camshaft worn out.