hi, this is my first post on audi forums, but i am not new to the site. OK here is my problem first of all i have an 01 1.8T. what i have done to the car is APR 93 oct reflash, Dahlback diverter valve boost gauge custom cone intake and the n75 k valve. The car has been running really slow for the past 2 weeks but is spiking at 19/20 in 3rd gear so boost is not my problem. last week i had a check engine light come on p0411 not sure if thats it but it was the vacuum hose from the combai valve that was ripped off....i replaced that and a couple other vacuum hoses one from the top of the diverter valve. i have had a CEL on for a while the first time it was the MAF i replaced it and felt the power from the reflash for the first time and it was running great... currently i am boosting with no CELfine but my vacuum sometimes reads 22 and since a week ago i have lost all my power it almost feels stock again!! i am thinking there is another leak some place but i have checked all the places you guys have recomended!!! if any one can shine some light on this it would be greatly appreciated thanks!!

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Anthony

Check for codes.

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2001 A4 1.8T Q Casablanca White, Tip, ESP, Xenon and Premium

i did there isnt any now im kinda thinking its the MAF again but i did that test when you unplug it and i didnt get more power only a CEL but then i plug it back in and the CEL goes away by its self... its weird

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Anthony

i am going to go with a vac leak.... that is what has always been my problem

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S4 bumper in my basement awaiting paint

any one????

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Anthony

there is also a sound, but i am not sure if it is the intake and the turbo making the loud whistling sound or a leak, my vacuum pressure is usualy at 20 but sometimes it's at 22

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Anthony

did your battery die, become unplugged long enought for the ECU to reset it self? Sometimes i have heard of this being a problem with chip'd ecu since it resets itself and the program is erased.

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just another day, another moment.

no it has'nt been unplugged, plus i am still spiking at around 19 it doesnt seen totaly dead, i mean its just not pulling as hard and not pushing me back in my seat when boost comes in like when i put in my new MAF the thing was putting me back in my seat in 2nd gear.

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Anthony

ok, i will repeat my statement, maybe a vac leak.......... has always been my issue

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S4 bumper in my basement awaiting paint

your probably just use to the power, BT time

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2001 Audi A4 1.8TQM
GIAC ~ Techtonics / Magna-Flow ~ Carbonio ~ Forge ~ Evoheatshield ~ Konig ~ Rieger ~ VIS