B5in2

Well I purchased a ECU from a fellow enthusiast with the 3 GIAC programs (stock, performance 91-93 ct., & race 100+ ect.) which came from a working car.

The car really pulls hard & is crazy fast now, but it seems like it's cutting fuel @ 4-5K rpm then kicks back in, sometimes it kicks in & out & in & out. Before & after that rpm range it pulls like a ****.

here are my mods to help narrow down & tonight I am gonna go to a friends who has a ross-tech vag-com to see if there's any stored codes & to switch to the stock program to see if it still does it.


-Just put in new plugs
-K&N drop-in filter
-710N diverters

I am still yet to remove & inspect the TBB & the accordion tube from the airbox to mani, I did briefly look at them & they seemed fine.

All this started immediately after swapping out my stock ecu & yes I gave the car time to do the TB adaption. I am gonna try switching to the stock program tonight & if it still does it I will swap my stock ecu back in to see what happens then, but I wanted to get some opinions & ideas of what else to check tonight.

thanks,

-Paul

quickaudi:STFA

sounds like a boost leak.

also, try putting your stock air filter back in and put the K&N in the trash.

papuc (MMI S4)

It picks up CEL much earlier and spits them out for user interpretation.

Honestly, every time I hear a problem about hesitation under WOT I always assume its EGTs.
Get the car checked with a Vag-Com and then see what codes it spits out.

By the way, what year is your car?

B5in2

Hooked it up to my friends ross-tech vag-com last night & it had no codes at all.

My car is a 2001 w/tiptronic trans.

I have been looking for a boost gauge but I can't find a pod, but I am getting to the point to where I'll just tape it to the dash.

I changed to the "stock" program last night & I can mash the 'ish out of the accelerator & it doesn't miss a beat, it's Silky Smooth.

I switched it back to "pump" (91-93 oct.) & it is eff'd up again

papuc (MMI S4)

Yeah, see its more sensitive in pump mode.

quickaudi:STFA

also, still say that means you have a boost leak.

B5in2

Yeah, I used GIAC's flashloader to switch it.

My friend thinks it's the trans freaking out, not slipping, but trying to shift too early & then freaking out

quickaudi:STFA

tiptronic?

B5in2

Yeah, it's a tiptronic.

This weekend my friend is gonna do the "sport mode" mod via vag-com for me & then I am gonna put a degree colder plug with .28 gap & check the hoses for any cracks, tears or loose connections.

quickaudi:STFA

in order to keep it from going crazy with its shifting.