do i have a air leak somewhere?

[SimpsonCC]

Hey,

i am getting the P2074 (permanant) as soon as i start the car.
(200hp)

Here are my Diagbox live data values at idle

• Atmospheric pressure: 980 mbar
• Charging pressure (before throttle): 990 mbar
• Reference intake pressure: 930 mbar
• Measured intake pressure: 950 - 960 mbar

What is working perfectly (Target matches Actual 1:1):

• Air mass flow: 8.3 kg/h
• Throttle position: 5°
• VVT positions: Inlet -26°, Exhaust 5°
• Variable valve lift: 0.400 mm

What has already been done:

• Replaced MAF and MAP sensors.
• Replaced all relevant hoses.
• Performed a smoke test – the system is 100% airtight to the outside.
• Reset and relearned all adaptation values (including variable valve lift/Valvetronic limits) without any errors.

Is the 20-30 mbar difference in intake pressure enough to trigger the error?
Does this mean i have a leak somewhere in the intake housing?

 

[lfe]

Have you modified the original intake?

 

[SimpsonCC]

Have you modified the original intake?

no, everything should be like it came from the factory.

 

[Pedro]

Rocker cover PCV valve leaks ?
Throttle Body faults (position sensors) indicates correlation is wrong could cause out of sync Airflow triggers codes P2074+P3067 which can point to motorised Throttle body issues
Wrong Airflow/Fuel mixture -Crankcase vent leak ?

 

[EddieJ]

Rocker cover PCV valve leaks ?
Throttle Body faults (position sensors) indicates correlation is wrong could cause out of sync Airflow triggers codes P2074+P3067 which can point to motorised Throttle body issues
Wrong Airflow/Fuel mixture -Crankcase vent leak ?

This.
PCV diaphragm split/torn or goo/carboned up, two diaphragms in rocker cover.
Throttle body spindle can call a movement but the flap doesn’t actually do it properly. Visual inspect by taking off the air in pipe from above 8mm jubilee clip on each end. From under, one 10mm to a support bracket, three torx screws that hold the actual body to the manifold. White plastic clip to the top of the body on the manifold pulls/slides forwards. Throttle body now moves about allowing you to bring it down and twist it a little to access the wiring plug holding it in.
Note. Rem to plug it in then position it in when refitting, can’t plug in with it bolted in, and use the clip.

 

[SimpsonCC]

This.
PCV diaphragm split/torn or goo/carboned up, two diaphragms in rocker cover.
Throttle body spindle can call a movement but the flap doesn’t actually do it properly. Visual inspect by taking off the air in pipe from above 8mm jubilee clip on each end. From under, one 10mm to a support bracket, three torx screws that hold the actual body to the manifold. White plastic clip to the top of the body on the manifold pulls/slides forwards. Throttle body now moves about allowing you to bring it down and twist it a little to access the wiring plug holding it in.
Note. Rem to plug it in then position it in when refitting, can’t plug in with it bolted in, and use the clip.

I may have found the problem.
After looking for leaks everywhere i found a torn membrane/valve in the rocker cover. It's not the big one that i already replaced but the one in the pictures. (i always thought its supposed to look like that until i took a picture and saw the tear marks where it seems to have broken off)

As soon as i closed the port airtight the air pressure went down to 930mbar which is eaxactly what the car calculated and as soon as i let go, it instantly went up to 960mbar and the motor started to shake and almost die.

Do you know if i can get a replacement for this one (can it even be removed) or do i really need a new rocker cover because of it?

 

[EddieJ]

There are diaphragms listed on eBay that may fit with a bit of adapting but the actual fitting could be a real pain to get at it.
There also could be a build up of crud within the area. You might be better off with a replacement cover.
While your hoking about, if you have had to deal with pcv issues, you might want to also look check you diverter valve membrane for degradation if they are all same age and same type material operating in the same oil mist/crank case venting location.
Save you a bit of hassle soon down the line.

 

[SimpsonCC]

There are diaphragms listed on eBay that may fit with a bit of adapting but the actual fitting could be a real pain to get at it.
There also could be a build up of crud within the area. You might be better off with a replacement cover.
While your hoking about, if you have had to deal with pcv issues, you might want to also look check you diverter valve membrane for degradation if they are all same age and same type material operating in the same oil mist/crank case venting location.
Save you a bit of hassle soon down the line.

you mean the one thats fitted to the turbo to dump the pressure when needed?
Surprisingly the membrane on that one looked mint and like new.

Damn okay, then i'll buy a new rocker cover just to be sure.

 

[Pedro]

I posted the procedure for changing the PCV Valve on the 200 which can be a known failure you don't need to remove the rocker cover to do it in fact you shouldn't need a new cover unless its been off the car & refitted badly this can cause problems if its been bodged up
The Turbo solenoid valve is recommended to be changed after 60.000Klms as the diaphragm can split also spring has possibly weakened due to wear