Testing intake runner flaps

[Natejo91]

Hi everyone,
I'm in the process of replacing the PCV/air oil separator, thermostat, water pump etc on my wife's SQ5.
I know that the intake runner flaps need to be depressed all the way down/open when reinstalling them onto the cylinder head.
I've done that, and all of them can open and move freely when I move the actuator arm.
That being said - is there a way to test them electronically with VCDS before reinstalling the super charger? Or is there an adaptation that can be don? Or can they only be opened with vacuum applied and engine running?

Right now the car is throwing a code for "7804 - Position Sensor for Intake Air Regulating Flap" and "9831 - Intake Air Regulating Flap" but I'm not sure if that is for the throttle body or for the intake runner flaps. Just want to get this sorted out before I reinstall everything just to find out that I will have to tear into it again...

Thanks!
-Nate

[Fresh.S4]

spray some throttle body cleaner into the bpv also?

as for the runners, i think if you attach a mity vac

[JRYtheS4]

Hi everyone,
I'm in the process of replacing the PCV/air oil separator, thermostat, water pump etc on my wife's SQ5.
I know that the intake runner flaps need to be depressed all the way down/open when reinstalling them onto the cylinder head.
I've done that, and all of them can open and move freely when I move the actuator arm.
That being said - is there a way to test them electronically with VCDS before reinstalling the super charger? Or is there an adaptation that can be don? Or can they only be opened with vacuum applied and engine running?

Right now the car is throwing a code for "7804 - Position Sensor for Intake Air Regulating Flap" and "9831 - Intake Air Regulating Flap" but I'm not sure if that is for the throttle body or for the intake runner flaps. Just want to get this sorted out before I reinstall everything just to find out that I will have to tear into it again...

Thanks!
-Nate

Did you do the work with the battery connected? The flaps are more than likely fine, they are vacuum actuated so there's no moving them without vacuum. Finish up your install and clear all your dtcs and then see if you get any codes.

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[Natejo91]

Did you do the work with the battery connected? The flaps are more than likely fine, they are vacuum actuated so there's no moving them without vacuum. Finish up your install and clear all your dtcs and then see if you get any codes.

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Yes, I did the work with the battery connected and hooked up to a battery tender. But I decided to run VCDS and see if there was an adaptation or output a could measure before putting the super charger back on.

So the car has lots of codes right now because the throttle body, MAP sensors and loads of other things are disconnected. But the two codes I posted earlier looked like they could be for the intake runner flaps. And the electrical connectors for those are plugged in so I thought maybe there was an issue.

If the flaps are vacuum actuated, then is the electrical connecter on each manifold just a position sensor then? There is no electric motor that can physically open the flaps?

Like I mentioned earlier, 6 six flaps move freely and can open completely when I manually move the actuator arm so I’m hoping there is no issue but since I couldn’t find a function to actually move them in VCDS, I was sort of thinking that the engine has to be running and providing vacuum to open them up. So as long as I have the electrical connectors and vacuum lines plugged in I’m hoping I should be good to go.


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[SwankPeRFection]

Clear all the codes and restart the car.

If you can move the flaps with your hand by actuating the motors on the front of them, then they’re fine and installed properly. If you didn’t by chance hook up all the plugs correctly or you tried to key On the car with the charger off, it will have set codes… it’s expected. Clear them all and any that come back you have to trace and figure out what they are. You can’t key the car On halfway taken apart and expect no codes to happen.

You’re chasing ghosts. The codes in question are because your throttle body isn’t plugged in.

[JRYtheS4]

Yes, I did the work with the battery connected and hooked up to a battery tender. But I decided to run VCDS and see if there was an adaptation or output a could measure before putting the super charger back on.

So the car has lots of codes right now because the throttle body, MAP sensors and loads of other things are disconnected. But the two codes I posted earlier looked like they could be for the intake runner flaps. And the electrical connectors for those are plugged in so I thought maybe there was an issue.

If the flaps are vacuum actuated, then is the electrical connecter on each manifold just a position sensor then? There is no electric motor that can physically open the flaps?

Like I mentioned earlier, 6 six flaps move freely and can open completely when I manually move the actuator arm so I’m hoping there is no issue but since I couldn’t find a function to actually move them in VCDS, I was sort of thinking that the engine has to be running and providing vacuum to open them up. So as long as I have the electrical connectors and vacuum lines plugged in I’m hoping I should be good to go.


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Next time do the opposite, work with the battery completely disconnected. Do that when you're doing pretty much anything beyond regular maintenance. The flaps are more than likely fine.

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[Natejo91]

Appreciate the tips everyone.

Just wanted to be sure that i wasn't missing a step on getting these intake runners installed properly before finishing things up.
With the vacuum line plus the electrical connector I thought that maybe the flaps had some sort of adaptation that needed to be done to get the angle/position of the actuator arm calibrated.
But I suspect the electrical component is simply a position sensor and not an actual motor.

Anyway, I did think to use VCDS to pressurize the fuel system and check the fuel rail for leaks before moving on...so I promise I'm not a complete idiot!
I will proceed with the water pump and T-stat install and then button everything back up and check for codes once I fire it up.

Thanks y'all!

[hardfive]

Appreciate the tips everyone.

Just wanted to be sure that i wasn't missing a step on getting these intake runners installed properly before finishing things up.
With the vacuum line plus the electrical connector I thought that maybe the flaps had some sort of adaptation that needed to be done to get the angle/position of the actuator arm calibrated.
But I suspect the electrical component is simply a position sensor and not an actual motor.

Anyway, I did think to use VCDS to pressurize the fuel system and check the fuel rail for leaks before moving on...so I promise I'm not a complete idiot!
I will proceed with the water pump and T-stat install and then button everything back up and check for codes once I fire it up.

Thanks y'all!

You can use a vaccume pump and hook it up to the vaccume port and pull vaccume on the intake manifold which will pull the flaps open for install. No different then you pushing the arm down. Its all just making sure they dont get caught on the shields below.

Vaccume pump is convincent to not have to manually hold the flaps while you torque the intake down. But to be honest more work to find a vaccume pump vs just squeezing.



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[Natejo91]

To close this one out - I finished getting the car back together yesterday and so far, so good! No DTCs related to the intake runner flaps (or throttle body) now that everything is plugged back in.


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[gringoloco2000]

Can you share the VCDS info on pressuring the fuel system? I know that it will prime when you open the door, but did not realize that this was something that I could do. I am in the middle of the same project. This makes sense to check for leaks. Thanks.

Appreciate the tips everyone.

Just wanted to be sure that i wasn't missing a step on getting these intake runners installed properly before finishing things up.
With the vacuum line plus the electrical connector I thought that maybe the flaps had some sort of adaptation that needed to be done to get the angle/position of the actuator arm calibrated.
But I suspect the electrical component is simply a position sensor and not an actual motor.

Anyway, I did think to use VCDS to pressurize the fuel system and check the fuel rail for leaks before moving on...so I promise I'm not a complete idiot!
I will proceed with the water pump and T-stat install and then button everything back up and check for codes once I fire it up.

Thanks y'all!

[Natejo91]

Can you share the VCDS info on pressuring the fuel system? I know that it will prime when you open the door, but did not realize that this was something that I could do. I am in the middle of the same project. This makes sense to check for leaks. Thanks.

With VCDS, go into the engine control module and then it’s either in “output tests” or “basic settings” there should be a drop down menu for fuel system electronics. It should pressurize the whole fuel system but won’t fire the injectors. If you want to monitor the output you can ask for it. You can get pressure before the high pressure fuel pump and after the high pressure fuel pump (the sensor on the driver side intake runner). Hope this helps!


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