Inlet flaps

[BenHol]

My inlet flaps seemed to have created a fault in the car this week, PSI in stoke were great and reset them for me. I'm considering a flap delete now, do others think that's best and maybe a decoke at the same time?

[MIDZ]

I'd check for vacuum leaks in the system first, other circuits (power-flap solenoid, exhaust-flaps..etc) can affect separate vacuum circuits (IM-flaps) which are otherwise ok.
Ran VCDS output tests on mine the other day and it showed up that I have a vacuum leak at the power-flap on airbox, no vacuum pressure left as soon as engine was switched off.
The power-flap solenoid is dead and I'm losing vacuum pressure through it.
Removed hose to PF and plugged with golf tee as temp fix till I fit new solenoid. All systems working again during VCDS output test-plenty vacuum with engine off, just need to lose some skin and draw blood fitting new solenoid....magic

[BenHol]

Oops just realised how many spelling errors were in my original post.

If it is a vacuum fault would it have reset ok do you think? As it seems fine now he has reset it.

[BenHol]

I'd check for vacuum leaks in the system first, other circuits (power-flap solenoid, exhaust-flaps..etc) can affect separate vacuum circuits (IM-flaps) which are otherwise ok.
Ran VCDS output tests on mine the other day and it showed up that I have a vacuum leak at the power-flap on airbox, no vacuum pressure left as soon as engine was switched off.
The power-flap solenoid is dead and I'm losing vacuum pressure through it.
Removed hose to PF and plugged with golf tee as temp fix till I fit new solenoid. All systems working again during VCDS output test-plenty vacuum with engine off, just need to lose some skin and draw blood fitting new solenoid....magic

That's all makes sense out of curiosity is a VCDS system expensive ?

[MIDZ]

A reset does what it says really Ben, so if you went below the limit on vacuum pressure that day and the IM flaps never rotated enough as per ECU command up comes a fault, although that doesn't necessarily mean its the IM flaps at fault, again you could be losing vacuum somewhere else which is affecting the IMF circuit. Now you've reset it, all is good until you maybe dip below vacuum pressure limit again due to a small leak....just my opinion and there's loads of old threads on here which helped me understand.

VCDS is a great tool, and the output test is expertly posted on here in FAQ's
Loads of VCDS packages for sale now starting at @ £225 from Ross-Tech UK dealers, and flea-bay but be careful of Chinese rip-off copies, I found a web-page somewhere that shows the visual difference between rip-off & genuine...I'll try and find it again mate

[BenHol]

Thanks for this, Iv now got a VCDS and found the fault. There is no faults relating the low vacuum. Will this be picked up by the VCDS?

[BenHol]

[MIDZ]

I don't think there is any way VCDS can show vacuum pressure as a figure or throw a fault to tell you it's low, but what you're trying to determine is there an electrical issue or a vacuum/mechanical issue with your IMF which the output test will provide by cycling that circuit.
I had no vacuum pressure stored with engine off so during testing solenoids would click away but nothing would move, power flap solenoid wouldn't click and no movement so decided to blank it off as a starter for six, low and behold ran engine to top up vacuum, switched off and now during output test IMF, exhaust-flaps all working.
Changed power flap solenoid today, audi wanted £86 for part-same new PIERBURG solenoid from ebay £34. All good and everything testing as normal

[BenHol]

I ran the out out test and everything worked ok, all flaps opened and closed. Although during the test the power flap did not fully close each cycle. It went from fully open to half closed and open again!

I also ran another fault test on engine ll this also brought up the same fault for bank 2.

It hasn't now got stuck in the past two days after intermittently sticking on Friday.

I'm going to call unit 20 today I think unless there are any other thoughts?

[MIDZ]

Sounds like your issue is with IMF control or position sensor and not vacuum then, that power flap should fully close aswell as I've read on here that can give you mixture issues by drawing in hot air

[Rw@@dy]

I had similar faults with the manifold flaps, ended up going to unit20 and had the manifold rebuilt, the runners were broke