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Title: 2000 s4 Boost surge, throttle cut Post by: heff on November 04, 2013, 03:39:15 PM Car is a 2000 s4, ko4 6 spd. Rs4 maf, siemens 60# injector, srm intercooler, bosch 044 pump, eurodyne/tapp software
The last few months the car is having very poor part throttle condition, As well seems to have less power at wot throttle as well. Car has misfires at idle but believe this to be from siemens 60 # injectors. While driving and at w.o.t the car has ZERO misfires. Plugs are ngk and gapped at .25, have new coil packs and i.c.ms. I Took some logs last night and will upload one at w.o.t that i start real low in rpm ( on side note hammering throttle early in gear vs later seemed to always have lower boost peak) and the second log shows my part throttle issue in regards to boost fluctuation or surging. I can see i am getting throttle cut., Not knowing what variable is causing all of these issues to react its hard to pinpoint...Hoping some of you that are familiar with tuning and reading logs can chime in with suggestions, if you need a log with different parametres i can produce them as well, thanks for any help! heres w.o.t log.. heres part throttle log http://i822.photobucket.com/albums/zz142/sasks4/3boostsurge_zpsac9bc38d.pnghttp://i822.photobucket.com/albums/zz142/sasks4/wotthrottlecut_zpsae2e5bbe.png Title: Re: 2000 s4 Boost surge, throttle cut Post by: heff on November 04, 2013, 04:04:14 PM Sorry here is the part throttle log..http://i822.photobucket.com/albums/zz142/sasks4/3boostsurge_zpsac9bc38d.png
the one in first post is w.o.t. run. Title: Re: 2000 s4 Boost surge, throttle cut Post by: Krayzie on December 23, 2013, 09:09:23 PM Hi,from the logs,it seems like your boost deviation is to high...actual vs specified. That's why you getting throttle cut,the ecu Is trying to keep your boost levels in check. Check all your vacuum piping,the wastegate and your n75 valve. Hope you come right.
Title: Re: 2000 s4 Boost surge, throttle cut Post by: Rocket on February 19, 2014, 12:02:19 PM You can adjust the wastegates with the 10mm bolts 2-3 turns toward the end of the rods (unscrew).
Title: Re: 2000 s4 Boost surge, throttle cut Post by: nyet on February 19, 2014, 12:03:30 PM waste gate lines are torn or your n75 is dead
Title: Re: 2000 s4 Boost surge, throttle cut Post by: vdubnation on February 19, 2014, 02:05:38 PM ^^^^^^^^^^^^^^^^^^^^^^^^
Seen this so many times just resolved this issue on someones car who was battling this for 18 months. Title: Re: 2000 s4 Boost surge, throttle cut Post by: Lost on February 19, 2014, 02:53:49 PM ^^^^^^^^^^^^^^^^^^^^^^^^ Seen this so many times just resolved this issue on someones car who was battling this for 18 months. And solution was? Title: Re: 2000 s4 Boost surge, throttle cut Post by: ddillenger on February 19, 2014, 03:17:43 PM Torn wastegate lines.
Title: Re: 2000 s4 Boost surge, throttle cut Post by: userpike on February 20, 2014, 08:20:52 AM I had an issue similar to this on my 1.8t, but without so much throttle cut, because of a pcv hose clamp I missed to tighten for a catch can...I assume a crack would give the same symptoms.
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