Hi Everybody,

this is my first post here, but i have been on this Forum a pretty long time.

Now I am not professional by any means and as my Name says, im a bloody Beginner.

I installed a HPA Intake Manifold and of course had the dreaded Issue of horrible cold starts.

(Let us not discuss the sense or nonsense of Installing a Aftermarket Manifold on this Engine, its in there I am going to run Direct Port Meth injection one Day so come to Peace with it....)

After countless hours of Research, i wanted to Post my Conclusion and get Approval of Professionals.

I know we had this Issue before and I am Incorporating it in to this Thread.

Here is what i did.

First solution was posted on the Forum and it did improve a bit.

FHOKH set to 4. This should disable Cat Heating which did improve the Cold start and had less Misfires in Cold Idle.
But not completly 0

Then I took a look in to LBKSOL and found the Maps to the Swirl flaps.

I set CWLBK to 2 to set the Mofo in Application Mode so that it follows all the Maps that are available.

KFLBKAPP and the others were set to 0, so that the ECU doesnt want to move the Flaps.

Really didnt show much improvement. But I let it sit like that anyway.

Then I spent hours on the Funktionsrahmen for MED 17.5 and I looked at BDEMST

I figure that the Issue is that the ECU is requesting to go in to other Modes instead of staying in Homogenous Mode.

I disabled this by setting TNUSTUSVB to 600 seconds (10 Minutes) And voila, I had really good Idle.

Always had my Polar FIS logging Misfires when Testing and I got like 1 on 1 Cylinder. I am hoping to eliminate that with new Sparkplugs.

I must admit that for the MIL Deletes I used a predefined Solution.

So please, Tell me what you guys Think, was it Clever or was it nonsense?

Thanks, and thanks for being so awesome on the Forum.

Dude, that isnt right... I was thinking about messing with TMOTSTOFF.... No, I edited TNSTUSVB to 600 sec.

That was Mindf**k on my Part.

Corrected it in my OP

On 17.5 golf GTI high TNSTUSVB did nothing better, maybe even worse on cold missfiring, so i revert it back.  I notieced low rpm missifirng dissapier when clt reach between 80-90degC.  And there are two factor maps of injection angle  which are switching just at this temperature. So i set them to subzero temp, and seems better. But again its subjective on one attempt and not full solution yet.

Yes these, but few days later i been able to test a car on cold, and still missfires. I checked realtime, it happends only with 30+ load  and say from 1200rpm to 1800. In that area in inj start maps have a dip, but i think its compensated by other offset maps.
During that test i clearly saw, that that missfires gone like a switch when temperature pass 85-86degC. So going to find and test other tables...

update: KLWTDY together with the changes to some injection angles  during cold start also didnt work

good news.
with:
FHOKH 4 (65535)
TMSTHKSO flat at -48
all swirl flaps maps at 0, (still dtc P2004(stuck open) as in the  off state flaps are closed and ecu sees them open all the time)
JERKING/MISSFIRE IS GONE! thanks!

bad news:
it dies 2-3 seconds after start, have to throttle it  to stay alive.
probably finding a way to start/stay in homegeous would solve it.

same effect could probably be done by TMSTHDHSPO single value at -48 but who knows.
i will test TVENMODHKS with a 600 seconds  insead of 0.2s to get good afterstart.

also, i hope DLBKSIMX(max delta for an implausible signal for flaps ) at 100 percent together with CWPSLBKE set to  0 should stop diagnosing LBK positioning completely, if sensor is connected  and OK

TVENMODHKS to 600 won´t work, max value is 5,1 sec, i´m also stuck somewhere at this point