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Old Sep 18, 2007 | 04:41 PM
  #691  
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Sorry if this sounds like a dumb question, but did you remove the battery cable and reset the ecu? Is the stock fuel pressure 38 psi? You have alot of porting done, but I don't think it's enough to lean it out that much.
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Old Sep 18, 2007 | 04:59 PM
  #692  
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Originally Posted by sykou
Okay i just got this working but i got a weird problem from after i removed the piggy. I get a CEL light and i pulled the code. Its a P0171 "System too lean" I made sure to reconnect the wire that i cut so what could it be? Also when I press the throttle gently and let off the rpms drop fast back to ~500 and my wideband shows ~17-20 AFR. Checked for any lose hoses after the MAS, Got my LC-1 wideband simulating the first 02 sensor.
My idle RPM is around 600 and the idle AFR is usually 17 which surprises me.

Mod list:
Cold Air Intake, 59mm Bored throttle body, Port Polished 4g93 Intake Manifold, Vision FPR set to 38psi, RRM Headers, 2.5" catback exhaust, RRM Pully

Hope someone knows whats going on here. Thanks!
How many miles your car have? P0171 it's probably your first o2 sensors that worn out. (I change mine at 70 000 miles.)

AFR at cruising speed... around 14.7
During deceleration... 20.0 (close throttle, no fuel...)
WOT, stock, 11.3 (Hard acceleration, 3th gear.)
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Old Sep 19, 2007 | 01:43 AM
  #693  
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From: Hawaii
Originally Posted by Speed Corps
Sorry if this sounds like a dumb question, but did you remove the battery cable and reset the ecu? Is the stock fuel pressure 38 psi? You have alot of porting done, but I don't think it's enough to lean it out that much.
Didn't remove the battery but i did pull out the ECU fuse which is supposed to reset it... Or does it not reset it correctly???
I believe stock fuel pressure is 32 psi so I upped it a bit to try remedy the lean condition...
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Old Sep 19, 2007 | 01:45 AM
  #694  
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From: Hawaii
Originally Posted by Redlancer
How many miles your car have? P0171 it's probably your first o2 sensors that worn out. (I change mine at 70 000 miles.)

AFR at cruising speed... around 14.7
During deceleration... 20.0 (close throttle, no fuel...)
WOT, stock, 11.3 (Hard acceleration, 3th gear.)

I got 43,000 miles on it. But the thing is i have a Innovate LC-1 Wideband. With that there is an output you can use to simulate the voltages that a narrowband would output. I have it hooked up as so to simulate the stock narrowband at the headers... does anyone have a pinout of where the O2 sensor wire is on the ECU?
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Old Sep 19, 2007 | 05:21 AM
  #695  
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From: Quebec, Canada
Originally Posted by sykou
I got 43,000 miles on it. But the thing is i have a Innovate LC-1 Wideband. With that there is an output you can use to simulate the voltages that a narrowband would output. I have it hooked up as so to simulate the stock narrowband at the headers... does anyone have a pinout of where the O2 sensor wire is on the ECU?

On some wideband, you can select the configuration of the output. I have 4 differents output settings on my AEM wideband to simulate the stock sensors. ( 0-1v,1-0v,0-5v and I don't remember the other one.)
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Old Sep 20, 2007 | 03:38 AM
  #696  
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From: Hawaii
k update. I replaced the O2 sensor, reset the ecu and relearned it. Still the problem persists. Noticed something else today, when i'm in gear and decelerating(engine braking) after the rpm drops to around 800 or so the AFR drops to 20ish and at the same time my rpm drops below 500 and bounces back up. With the AC on my rpm at idle keeps looping- revs up to 800 then drops back to 200ish then revs up again and again. HELP PLEASE!!!
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Old Sep 20, 2007 | 06:41 AM
  #697  
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From: Buffalo Grove, IL
Originally Posted by sykou
k update. I replaced the O2 sensor, reset the ecu and relearned it. Still the problem persists. Noticed something else today, when i'm in gear and decelerating(engine braking) after the rpm drops to around 800 or so the AFR drops to 20ish and at the same time my rpm drops below 500 and bounces back up. With the AC on my rpm at idle keeps looping- revs up to 800 then drops back to 200ish then revs up again and again. HELP PLEASE!!!
Sounds like you may have a vacuum leak. Do you have a vacuum/boost gauge installed? You should be between -18 and -22 at idle and whenever you are off of the throttle.
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Old Sep 20, 2007 | 01:25 PM
  #698  
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wideband

Originally Posted by Redlancer
On some wideband, you can select the configuration of the output. I have 4 differents output settings on my AEM wideband to simulate the stock sensors. ( 0-1v,1-0v,0-5v and I don't remember the other one.)
Which one of these different outputs should you be using? I have a wideband but have not installed it yet so it would be usefull to know. Also does anyone know which of the O2 sensors would be best to replace with the wideband?
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Old Sep 20, 2007 | 01:30 PM
  #699  
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Originally Posted by Frankracer88
Also does anyone know which of the O2 sensors would be best to replace with the wideband?
none, you don't replace any of the stock O2 sensors. you gotta get a new bung welded onto the downpipe



Also, i got a Tactrix cable on the way, and all the software on my computer. Hopefully i will be able to get all this going by the weekend. WOOT!
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Old Sep 20, 2007 | 01:48 PM
  #700  
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From: Buffalo Grove, IL
Originally Posted by crypto
none, you don't replace any of the stock O2 sensors. you gotta get a new bung welded onto the downpipe



Also, i got a Tactrix cable on the way, and all the software on my computer. Hopefully i will be able to get all this going by the weekend. WOOT!
If you can't find a working definition file for your ROM, send me a copy of it or post it up here and I'll work on making a definition file for it.
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Old Sep 20, 2007 | 01:49 PM
  #701  
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Well wthen which one do you cut the wire on and which wore so that the car reads it like it is a regualr o2
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Old Sep 20, 2007 | 01:51 PM
  #702  
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^i'm pretty sure you can't do that. Cos the wideband sensor is completely different to the stock one. So the ECU can't understand the signal from it.

also why do you wanna hook it up to your ECU? you just need to weld a bung, put in the sensor, then hook it up to your laptop or guage


Originally Posted by senate6268
If you can't find a working definition file for your ROM, send me a copy of it or post it up here and I'll work on making a definition file for it.
thanks mate. i will let you know how it goes when i've got the cable
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Old Sep 20, 2007 | 01:59 PM
  #703  
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From: Buffalo Grove, IL
Originally Posted by Frankracer88
Well wthen which one do you cut the wire on and which wore so that the car reads it like it is a regualr o2
Its exactly like crypto said, you're simply adding an extra sensor that allows you and only you to monitor. The ECU still monitors the 2 stock sensors as normal and with the added sensor, you get to see what your AFR is for tuning. All you do is have an extra O2 bung welded in on your cat and screw in the wideband O2 sensor.
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Old Sep 20, 2007 | 02:01 PM
  #704  
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ya i have an inovative lc-1 and on it there are two outputs each of different voltages that they say can be spliced into your car so they act as a main o2 sensor
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Old Sep 20, 2007 | 02:04 PM
  #705  
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From: Fort Myers, Florida
^that would really be kinda pointless. I'd just leave it alone, it sounds like more work than it's worth
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