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Runs great at WOT but awful when cruising???? Help please

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nightmares GS-T

10+ Year Contributor
332
3
Aug 18, 2009
Pearl, Mississippi
Alright so today a friend and myself installed a MAFT and a GM MAS. Now my only issue so far is that it idles and runs fantastic at WOT (pulls so hard for a t-25) but when just crusing around or at part throttle im running 10 on the wideband and probably lower. Anyone have any ideas? Mods include all free mods, MAFT and MAS, and a full exhaust. Im using evoscan and a wideband to monitor the engine. It shows 0 knock at WOT. Another odd thing is that evoscan is showing that my fuel trims simply refuse to update. Any help would be greatly appreciated because right now im gettin terrible gas milage and bad performance unless im building boost. As soon as I begin building boost it leans out a little and runs great.

:ohdamn: forgot to mention im running a punishment racing front mount and the MAS is in blow through config.
 
im having the same problem but my a/f is 14.5 cruising around and it will jump lean randomly and spit and spudder a little i wonder if its a similar problem??
 
im having the same problem but my a/f is 14.5 cruising around and it will jump lean randomly and spit and spudder a little i wonder if its a similar problem??

could be, I am looking into it right now wondering if my front o2 sensor is bad. According to my logger its giving alot of readings of 0. Wonder if thats normal.
 
after warmed up it should cycle between 20-80 i believe, my car wouldn't idle right when my front o2 wasnt working
 
after warmed up it should cycle between 20-80 i believe, my car wouldn't idle right when my front o2 wasnt working

well even before the maft install it would run fine until it got good and hot and then it would begin running rich again.

wow 53 views and a total of 2 replysWTF? I see the information is overflowing here.
 
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