Misfire Wot Boost

[Tanzimur]

Whats goin on guys! I have a 550cc "k04" setup. Upon wot i get a mis or two but it continues to pull through. I have gapped the plugs to .028 at first but changing it to .026 was better but still miss in forst and second gear weather i ease into the throttle or not.

What im asking is what should i look into atm? I heard and read intake setups make a big part in this mis case. I have changed maf, all 4 coils and such so any help is appreciated!

[Believer]

Whats goin on guys! I have a 550cc "k04" setup. Upon wot i get a mis or two but it continues to pull through. I have gapped the plugs to .028 at first but changing it to .026 was better but still miss in forst and second gear weather i ease into the throttle or not.

What im asking is what should i look into atm? I heard and read intake setups make a big part in this mis case. I have changed maf, all 4 coils and such so any help is appreciated!

Are you getting any DTCs for the misfires to help indicate if it's a specific cylinder? If you have VCDS i would monitor group 15/15 while going WOT to see which cylinders you're getting misfire hits on. From there you can swap a coil pack around to ensure those aren't causing you issues.

[MarcRogers]

I have the same problem. What motor code do u have. I changed my plugs and it helped ALOT! But I'll get a miss every once and a while while under WOT. I have yes to do it but I was told by mulitple sources to do the 2.0t coil conversion. Whit h defeats the ICM. I'm still in the progress of that. But if it helps I runs NGK BKR7E plugs gapped at a .28


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[Dan[FN]6262]

Spark Plug PSA: Stop running NGK plugs.


If you're stock, run Bosch F7DTC plugs

Stage 1-2: Bosch F6DTC

Standard K04 w/ OTS tune: F6DTC

Any setup larger than OEM K04 that is running a lot of boost, timing, meth, custom tune ect: Bosch FR5DTC

[Believer]

Spark Plug PSA: Stop running NGK plugs.


If you're stock, run Bosch F7DTC plugs

Stage 1-2: Bosch F6DTC

Standard K04 w/ OTS tune: F6DTC

Any setup larger than OEM K04 that is running a lot of boost, timing, meth, custom tune ect: Bosch FR5DTC

Bosch FRXDTC all the things.

[Tanzimur]

No dtcs and ye im running stage 2 3in vr maf housing 550 ev 14s and such why are ngk bad? And aeb 1

[GOODBYNAAIR]

I have run bosch supers tri with no problems on stock stg 2 and GTRS with stock cols and 2.0 coils I have also run NGKs BKR6EIX-11 AT .40 with no problems with 2.0 coils. I'm currently run them at .32 with no problems.

I have not used them but the NGK BKR7E but it is one of the most common plugs used in the 1.8t would with great success. GTI jetta passat A4 ect
do you have stock coils? is your tuning setup for your upgrades?

[Dan[FN]6262]

I have also run NGKs BKR6EIX-11 AT .40

That's because they are a much, much better plug than the copper core BKRxE that is typical for people to run.

They are also nearly double the price of Bosch Super Tri

[GOODBYNAAIR]

That's because they are a much, much better plug than the copper core BKRxE that is typical for people to run.

They are also nearly double the price of Bosch Super Tri

from looking at my data logs i saw very little difference when I changed plugs. plugs are pretty important IMO a few extra bucks on plugs when running a modded car its the right call I would think.

[Tanzimur]

Yes stock bottom and top end 1.8t aeb, yes my tuning us setup for my setup. And f6dtc what should i run theese?

[Tanzimur]

Nvm i see they are 3 prong... lol

[Dan[FN]6262]

from looking at my data logs i saw very little difference when I changed plugs. plugs are pretty important IMO a few extra bucks on plugs when running a modded car its the right call I would think.

to each his own.

- - - Updated - - -

Bosch FRXDTC all the things.

That's right! hahaha

[Tanzimur]

So new plugs in same problem misfire/ hiccup every other wot pull or even easeing into it... whats next fellas?

[Dan[FN]6262]

boost leak test. maybe ICM

spray your MAF sensor down with this stuff

[Dan[FN]6262]

take a log if you can. sometimes a dying CTS can cause this issue

AFR gauge?

[Tanzimur]

Gotcha! Maf is good tried a few diffrent ones, and no,boost leaks vac us at 21hg all day. Icm dieing? I thought they were either bad or good... and i,will see the cts reading via vag tonight!

[Dan[FN]6262]

You're only measuring vacuum at the intake manifold, you could still have a leak before the throttle body that is only present under pressure. Like maybe your DV diaphragm is leaking or a bad block breather check valve. pancake valve on intake might be bad

[Tanzimur]

For sure! The dv is a forge adjustable spring type one and its good i regreased and such before instarted driving the car! But the pcv pancake sounds possible... but i thought thay was only to plug off boost from entering the crankcase?

[GOODBYNAAIR]

lose wire / pin on one of the coil connectors ? happen to me and the car would just randomly misfire. something to think about but seems like you only get it when WOT.

[Tanzimur]

No its when i ease into now... and all them loom tight last i checked this morning

[Tanzimur]

But how would a bad pcv valve cause it to miss exactly?

[Dan[FN]6262]

boost going back into the turbo / block instead of being ingested by the engine. So it'd probably run so rich that it causes misfires. Why I asked if you have a AFR gauge.

[Tanzimur]

For sure! Can i simply tell by blowing in and sucking on the pcv you think?

[Dan[FN]6262]

to be completely honest, I do not know lol.

[GOODBYNAAIR]

No its when i ease into now... and all them loom tight last i checked this morning

the wire inside the loom was pulling away from the pin in the connector.

[Tanzimur]

Well damn... now you got me thinking about that lol idk im going to try all suggested acts tonight!

[Tanzimur]

Well ive checked the pancake valve and while its running i bent hose so it blocks off the pcv puck and it was idling worse so thats a good sign its good still. Also redid tb adap with vag, still hi boost around 4k 5k rpms slight 1 2 miss then it goes then sorta dies down.

No vac leaks or boost leaks as well...

[Tanzimur]

Oh and another thing i forgot to mention was others have talked about their intake setups, when misfires happen they extended where the maf sits away from the turbo and such?

[Tanzimur]

ALrite well ive removed the pcv or some call hockey puck valve and i can blow through it barely but a good amount when 18psi hits im sure... i threw this new oem one in and thhe cars idling around 1100 rpms didnt feel a miss yet... but im sure itll find its way back...

[Dan[FN]6262]

idles 1,100 rpms at operating temperature?

[Tanzimur]

Yes... still getting misfires anything over 5k but if im at low speeds and in higger gear i can go wot and boost will build and hold till... tried new coil packs, vac an boost press tested, maf was swapped around with a known working one, fresh f6dtc plugs... im kind of lost at this point...

[Tanzimur]

Alrite little update, did the coil pack conversion, and installed a walbro 255 pump no more misfires, but feeling a timing pull it feels like around 6k it feels like im letting off the throttle slightly and then getting back on it slowly... what should i start to log or look at that for the info?

[Wrath And Tears]

If you are idling at 1100 then something is wrong, 880 is normal. Sounds like you need to try a throttle body alignment if you haven't yet. I think there was talk about that, not sure if it ever happened. Otherwise it sounds like you have a vacuum leak somewhere.

[Tanzimur]

If you are idling at 1100 then something is wrong, 880 is normal. Sounds like you need to try a throttle body alignment if you haven't yet. I think there was talk about that, not sure if it ever happened. Otherwise it sounds like you have a vacuum leak somewhere.

Ye the idle issue was resolved with another oem pcv valve, vac is at 22inhg at idle and around 26 27 in gear driving letting off gas. Doesnt sound like boost leaks even when i make it to 18psi toeing into the pedal. Kind of stumped here. Today i logged the knocks value and cyl 2 was the highest of 18v all the other were right around 16 17ish and maf was still great flow wot in 3rd gear around 130gs...

[Tanzimur]

well last night its was cooler out around 72 degress as well as this morning and it seems the light stuter did not appear till it was warmer out... went right past 6k easily!

[Tanzimur]

Alls well replaced cam sensor, installed new mbc! idles crazy nice with the 2.0t coils!