Ok.. Super weird problem for u guys.. First off I'm running a le5 boosted with a trifecta tune on its first update from the base file.. Well I was getting some random misfires and going really lean at ideal with lean spikes while pulling.. I scanned and got codes for 02 sensor and random misfires of corse.... So I replaced the 02 .. Smoked for vac leaks.. Checked my fuel pressure.. And everything seems fine.. Check engine light went away.... But I'm still getting this lean spiking idel .. Like high 20.s to the point the car will stall! ..been in the shop all night n we r all stumped.. So then I start to feel like it got better over time.. I shot out to a friends house about 20 of highway driving..even opened it up a Lil to see if I got the misfires and slightly Lil hesitations but nothing crazy.. Car was plenty warmed up tho... First light.. 20.1 and surging! At idle.. Mean while no real misfires the way there .. Just at the light.. She stalled out .. Next light about 2 min later came close to stalling bouncing from 18 to 20.. Next stop sign I sat for a sec it spiked and then worked its way bak down to 14.. Random stops bla bla by the time I get to my destination idle is super steady at 12.1 to 12.4 .. Seems like my ecu is adapting .. I've seen something on this b4 but very uneducated when it comes to tuning.. And ideas?

 

Disable 02 tests in the tune if you can. It forces lean then rich to check for response at idle. Could be evap test also, check purge sol & tank sol.

Any codes?

 

I would 1 try to re-flash it one more times. Sometimes it don't take right the 1st time. 2nd check fuel might of got some bad fuel. 3. Send a log to Vince if he says it's all good buy a hpt tune.

 

I did have an evap code! Turned out the evap solenoid wasn't fully connected soo i connected it ..Also I was running a filter off the valve cover vent soo I ran a hose back to intake b4 the turbo and to the valve cover.. But the problem persists.. I have red lashed since then.. Since then no codes

 

So after this tank of gas .. Im assuming use it till dam near empty.. Let the evap test do its thing .. And the next full tank sould be good right? Or is there a procedure or something that needs tp actually be tuned?

 

evap tests run between 1/4 and 3/4 tank iirc. Time will tell.

 

Thats what i thought .. Soo sould i fill it up or just to 3/4 to get it testing again