Misfire under heavy load at full throttle

[MarcRogers]

So I have a b5 a4 AEB block.
Stage 1 tune
Drop in filter
Test pipe
Full exhaust 2.5in to 3in muffler

The car runs great if give it anywhere from 1/4-3/4 throttle as soon as I give it full throttle it pulls normally until about 4-5 grand then it sound like I'm getting some type of fule cut.

Anybody have any idea of what this can be?


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[arbeiter]

So I have a b5 a4 AEB block.
Stage 1 tune
Drop in filter
Test pipe
Full exhaust 2.5in to 3in muffler

The car runs great if give it anywhere from 1/4-3/4 throttle as soon as I give it full throttle it pulls normally until about 4-5 grand then it sound like I'm getting some type of fule cut.

Anybody have any idea of what this can be?


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I had this exact problem..
Same car.. Same mods..
I'll save you some headaches..
Install new spark plugs.. I used NGK'S the second time it started happening, the Bosch ones for some reason didn't last very long before it acted up again. I swapped and replaced a couple coils you, but ultimately it was the spark plugs.
Let me know if this helps

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[MarcRogers]

What are the gaps on yours


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[MarcRogers]

And did the new sparkplugs fix the problem


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[arbeiter]

And did the new sparkplugs fix the problem


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Yes new plugs fixed it. Stock gap.

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[arbeiter]

And did the new sparkplugs fix the problem


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Mine "shuddered", thought for sure it was fuel... But ended up being ignition.

[MarcRogers]

Cool thanks man appreciate it


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[Seerlah]

You blow out the the spark with the added air intake by the throttle.

[MarcRogers]

So a hotter spark should fix the problem


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[Waspjr]

Or a lil tighter gap


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[Seerlah]

Could be your gap is wrong, or you simply need to replace your plugs. Just replace them and know how long the particular plug you pick up lasts for. For example, the ones I run are good to roughly 25k.

[xXNateDawgXx]

I had the same problem it started right after I got my GIAC tune. replacing the plugs helped but not much swapped coil packs out still nothing did some research and narrowed it down to the ICM so I ordered a cheap one off amazon or eBay for like $15 that also helped but did NOT completely cure the problem. I was still stuck on the idea of it being the ICM and happened to find an OEM one at the local junk yard which ended up solving the problem. It might be worth a shot if new plugs don't work. I ended up doing the ICM delete with a new harness and soldering it in pretty easy to do and cost like $90 at the dealership for the harness. Good luck figuring it out, keep us updated!


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[MarcRogers]

Ok so I'm still going to get new plugs. But I'm doing the 2.0t conversion which includes the ICM delete


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[xXNateDawgXx]

OEM ICM $125>> https://www.europaparts.com/ignition...4d0905351.html

034motorsports ICM delete easy plug and play, but $250!!>>
https://store.034motorsport.com/coil...FQuGaQodiFUBfA

Coil harness $73 from ECS.>>
https://www.ecstuning.com/ES2506749/...FQyEaQodH1QNSQ

I didn't want to wait and got it from the dealer for $90 and they had it in stock not as easy as the PnP but a lot cleaner and cheaper if your not afraid of cutting up/soldering your harness.
This is the how-to I followed >>
http://forums.vwvortex.com/showthrea...de-harness-FAQ


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[storey618]

just had the same thing happen to me but it was at 17psi it would shutter and felt like everything shut down until i fell below 16-17 psi. installed new spark plugs (had autolites) i used ngk g powers gapped at .035 car runs great now

[Seerlah]

Autolites are junk.

[storey618]

Autolites are junk.

word, i was really happy to change them out