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stuttering after o2 dump, cams, and mani install

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LRS95TSI

15+ Year Contributor
450
4
Nov 9, 2004
louisville, Kentucky
so...after i let my new act 2100 break in, i got a set of fp1i/fp2e cam, a o2 dump and a ported 2g manifold and put it all on. with my new o2 housing on it seems as if my wbo2 (lm-1) is reading off sometimes. i hook it to my laptop and read my logs from that. when i hit full boost the car begins to launch and stop, launch stop, kinda hard stuttering. when i hit full boost the lm-1 goes up to like 20 and a 2.0 lambda symbol. i know that i am not that lean for 1. the car would probably blow up and 2. i richened up the safc a great deal so i could start tuning from a good basis and low boost, so if anything i'm rich (about a 10 to 10.5). i was told that when the o2 begins to "dump" that my afr reading would not be altered. i am dumbfounded on what the problem could be. but i cannot gun the car because i don't get any response. i really need to get this fixed as my dyno day is approaching and i still havent tuned it.
 
Check the plugs and wires. Replace if old or not known when they were last replaced. Gap the plugs to .28 and get one heat range colder plugs.
 
i have accel 7920 wires and bpr7es plugs with minimal miles. the gap is a little larger then .28 maybe .30 or .32, should i reduce it? as far as a boost leak, where could it be coming from? is there an easy way to test for it, or do i hafta build something?
 
so i did the boost leak, and found that the only spot that was leaking was my idle adjustment screw on top the throttle body? is that normal. none of my i/c pipes are leaking. no pc valve problems, nothing. please help i gotta get this fixed :mad:
 
Could be that when the wastegate opens and dumps your not measuring all the air, but it should be close. Do you have an egt?

On the other hand I run an lc-1 with my aem and havent had any problems, i dump back into the exhaust. lc-1 is just the controller and wb o2 sensor, I read lambda off the computer. I would definately do some searching, if your running out of fuel under boost, you know what happens.
 
update....
so i pulled my plugs out and they were i assume shot. the gap was at like a .35, so i put new ones in and hafta test the car tom. so i will get back to the thread then. if that doesn't fix the problem i am lost. as far as the wideband goes, i read previously that if i dumped my readings would not change so im kinda lost.
 
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