UNknow problem. very annoying VID inside

[ROIDMONKEY]

been having this problem for a while .. its a on and off thing but getting more on than off lately. car just runs like one inj stop working or some like that , wideband indicate lean very lean , can be when the car is cold in the morning or even after running on the highway after being cruising at 70-80mph(barely touching pedal to keep that speed) but if i thread the car hard and boosting all the time he act normal :) . every time that problem comes it take a good 10-15 mins for the car fix himself(runs crappy shut off easily have to keep gas to keep it alive) , i changed ECU temp sensor,IDLE AIR CONTROL VALVE, check all the hoses ,recalibrate the TPS , changed the coils, gonna end up buying every single sensor in this frikin SR :)
anyway watch this video the first 10-15 seconds see what im talking about about car running lean then fast forward to 1 min(almost the end) and watch when i do some gas pedal and the car just go back to normal after ?
any ideas?
dont think is tunning otherwise car would do it constant

http://i48.photobucket.com/albums/f248/Ajfina/th_VID2000019-20081120-1605.jpg (http://s48.photobucket.com/albums/f248/Ajfina/?action=view&current=VID2000019-20081120-1605.flv)

[bkfill]

do you have a fuel pressure gauge?

if not i recommend a in line gauge

[ROIDMONKEY]

do you have a fuel pressure gauge?

if not i recommend a in line gauge
i do have all the upgrades necessary pressure is a 45 idle,top feed 1000cc injects, 2 fuel pumps , cars make 505whp (not trying to show off just to let people know car has all those upgrades)

[sc300fivespd]

dude are you running stand alone? hope u got a fuel pressure regulator. wtf is 45 idle? looks to me like u got a shitload of fuel coming in when its not suposto broh. regulate that shit and lower it at idle until it's stoich

[ROIDMONKEY]

dude are you running stand alone? hope u got a fuel pressure regulator. wtf is 45 idle? looks to me like u got a shitload of fuel coming in when its not suposto broh. regulate that shit and lower it at idle until it's stoich
yes i do have a fpr like i mentioned up here . i do have a stand alone AEM EMS.. like i said the car has alll the extras .its a fully build sr has evrything...

[tougekid]

cheack your O2 senser!

[ROIDMONKEY]

cheack your O2 senser!
not running O2 sensor

[Grimsta]

yes i do have a fpr like i mentioned up here . i do have a stand alone AEM EMS.. like i said the car has alll the extras .its a fully build sr has evrything...Everything? So its a dry sump oil system and you have an external fuel surge tank as well? J/K. I would say it IS your tuning. It wouldnt have to happen everytime if it was tuning. I wasnt able to watch the video but I tune EMS and FIC's and based on your description, it sounds like there is a hole in your tune map. You say it hits hard and runs like it should under WOT, but not under very light throttle, well thats the tune issue. You see you have the map tuned to compensate for all sorts of boost conditions and higher throttle openings, but its not set correctly for very light throttle. When you're cruising you should lean out a little to save gas, but if you lightly open the throttle to maintain speed and you're tune doesnt go down to that little engine load, more air is going to enter the engine from the open throttle, but your computer isnt goin to add the fuel. When I tune a MAP I start everything at 0 and tune up from there. Lots of tunes on the map wont start until 800 RPM or a certain % of engine load since USUALLY you wont see those conditions. But I tune that way for OEM driveability. This Scion I most recently tuned had sort of the opposite of your problem, under very light throttle it went rich to 10.5 so I had to back the numbers down on light throttle to save him fuel, yet it still enrichens right where it needs to now when under hard boost. It takes a few hours to finely finely tune a MAP like that.

cheack your O2 senser!You think his wideband sensor is bad?

[50/50]

Is the ems in closed loop and when does it exit closed loop?
Is your wideband sensor close to your turbo?
What is the battery voltage when you have the problem?

[ROIDMONKEY]

Everything? So its a dry sump oil system and you have an external fuel surge tank as well? J/K. I would say it IS your tuning. It wouldnt have to happen everytime if it was tuning. I wasnt able to watch the video but I tune EMS and FIC's and based on your description, it sounds like there is a hole in your tune map. You say it hits hard and runs like it should under WOT, but not under very light throttle, well thats the tune issue. You see you have the map tuned to compensate for all sorts of boost conditions and higher throttle openings, but its not set correctly for very light throttle. When you're cruising you should lean out a little to save gas, but if you lightly open the throttle to maintain speed and you're tune doesnt go down to that little engine load, more air is going to enter the engine from the open throttle, but your computer isnt goin to add the fuel. When I tune a MAP I start everything at 0 and tune up from there. Lots of tunes on the map wont start until 800 RPM or a certain % of engine load since USUALLY you wont see those conditions. But I tune that way for OEM driveability. This Scion I most recently tuned had sort of the opposite of your problem, under very light throttle it went rich to 10.5 so I had to back the numbers down on light throttle to save him fuel, yet it still enrichens right where it needs to now when under hard boost. It takes a few hours to finely finely tune a MAP like that.

You think his wideband sensor is bad?
thanks for the reply
when im cruising and the car is acting fine i have no problem . like i can go slightly throttle cruising on the highway and is fine wideband indicates 14's at again slightly throttle . meaning that if i keep that slightly throttle for miles and mles the problem occur /starting happening like wideband was at 14's then after problem kicked in it goes down to --- or 17's so when i stop on a light rpm drop very low and car runs bad (very lean) so in the next 10 mins or so car come back to normal again . took the car twice to my tuner so he can check the problem but everytime i go there car act normal LOL he checks the maps and everything looks fine..

[ROIDMONKEY]

Is the ems in closed loop and when does it exit closed loop?
Is your wideband sensor close to your turbo?
What is the battery voltage when you have the problem?
wideband is not that close to the turbo .. battery vol indicate 13.4 when problem is happening

[water]

What kind of injectors are you using?

[ROIDMONKEY]

What kind of injectors are you using?
delfi 1000cc

[water]

Well you have an AEM...id start data-logging.

I'd also get on the AEM boards and start asking the techs there.

And maybe find a better tuner.

[sc300fivespd]

the tune needs to be stoich at idle furn down the fuel map at idle rpms....